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um okay so here's my announcement board, first off you have chapter three, homework and i bumped the due date back, so it was scheduled to be due, wednesday night the night before the, exam and i would still prefer you to do, it the night before the exam, um it's just that we aren't finishing, that material till today, and i wanted to give you a couple extra, minutes like if you don't want to fully, submit the assignment, um but you want to work on it some um i, would i just wanted you to be able to, like fully study for the exam, although i think doing the homework will, help you study for the exam okay so, anyways it's just not doing mastering, till friday at midnight but, um the syllabus is not updated yet so, just be aware, that this is due friday, okay you also have quiz 3 today, so that should be live now and, don't do it during lecture obviously or, you might miss something important here, but, you have till the end of the day to do, that just our typical format five, multiple choice questions 20 minutes to, get one it's timed assignment, so don't forget quiz three um let's talk, about exam one, so here's some really important stuff, about exam one, number one do not forget to sign the, academic integrity form, okay that's this right here on the, quizzes you know i have you sign those, i've had it in the past and it just, happens and i know they never intend to, but i've had some students not, sign that and i think they just forgot i, think they just got busy looking at the, questions they're like oh i'll come back, to that, just don't forget just do it first thing, okay it puts me in a really tough spot, if you don't sign that okay because i've, said on there you can't receive above a, zero if you don't sign it, okay because you're committing to do the, exam with integrity, and so if you don't sign it and it's, just because you forgot well how do i, know it's just because you forgot i'm, gonna assume that, because i genuinely believe nobody would, intentionally not sign it, but it just puts me in a really tough, spot so please don't forget to sign that, also there may be a question probably, just one where you have to upload an, image of your work, okay has anybody had to do this in the, past for other classes, you can shake your head okay so if you, have not had to do this, i'm going to recommend something to you, i think whether you have an android or, an iphone, there is an app called scannable, okay it's blue and it has like a little, butterfly or something on it, it's an app that i recommend students, last semester loved it, it allows you to hover over a document, with your phone, so i will allow you to use your phone to, take a picture of your work, and it converts it directly into like a, pdf, okay now you can't upload a jpeg, or pdf to the exam but other formats, sometimes don't work out well, so i i really prefer you upload any, pictures of your work, there may be times you have to hand, write out your work take a picture of it, upload it to exam, jpeg or pdf and that will be in the, instructions and this just sometimes, causes students stress because it's, something you do but then it's it's, you got to keep in mind save a couple, minutes either during the exam or, afterwards to, take a picture and you know transfer the, document and upload it so i understand, that takes a couple minutes you're going, to have two hours to take the exam, which is much longer than our class time, we only have an hour 15. so if we were, in person you'd only have to an hour 15., so you have plenty of time if you have, any questions about, or doubts in your mind that your, document did not upload correctly, just email me a picture of your work, okay and as long as you don't, you know as long as you've evolved me, right then and there and not like hours, later, okay where that could be questionable, did you work on this problem later, if you've emailed me right then and, there i'll see the time stamp then i can, accept work via email, okay but please try to just upload it to, the exam, i just highly highly recommend this, scannable app i don't think it costs, anything if you have questions on that, let me know so you will have to upload, an image one picture, of your work to the exam and i don't, want that to stress anybody out, i prefer jpeg or pdf format um you guys, you, 8am section you'll be getting on, thursday at 8 am you have to take the, exam at our lecture time, so if you hop on at 9 30 or in the, afternoon, the exam you'll have missed it just like, a normal class okay so treat this as an, in-person thing, you are taking it at 8am you have to log, on it will be live from 8 am to 10 am, for you, and that's it so please don't miss that, um it will be password protected because, i do have a group after you guys and i, want them to take it at their time, so i will send you i will email you the, password by 7 30 am that morning, okay i will email you that password so, check your email at 7 30 a.m, you'll have the password when you log on, at 8 00 am to take the exam, you'll put in that password any, questions so far on the exam, it's worth 100 points and i will when i, go back in and grade i will add your, bonus points, as i'm grading so those won't be, initially added but as i grade your exam, and, and then go evaluate your response to, the bonus point question, um i will add those in which by the way, the opportunity to receive bonus points, is now, gone you had to respond to the, discussion board question by last night, and i can see what time people put their, responses in, because we're going to talk about the, answers to those today because i want, you to feel confident with those style, of questions, all right so that's the exam now we're, going to talk about the dry lab um the, conversions, dry lab there was some issues apparently, with reporting numbers in scientific, notation specifically for, this problem right here okay um, we may have to report numbers in, scientific notation, in future so that's why i want everybody, to know what i meant, when i put all those instructions and, things i see something in the chat hold, on, um on this problem of the assignment, okay uh question in the chat if you want, to meet on zoom, at any point with people or to study i'm, pretty sure you guys can meet for up to, an, hour i think it should be free because, you have, uca credentials beyond that you may have, to just start another zoom, or take a break and meet up later i, don't know, i don't think you can do our uh meetings, and it may only be 45 minutes i'll, i'll try to check on that but i know, students last semester would form study, groups, via zoom and meet for like 45 minutes, and then maybe take a break and meet, again okay so, um there you go bailey says hey, everybody we're starting a study kim, group if you want to, join check the group chat perfect thank, you bailey, all right let's look at this really, quick so um, this problem i'm just going to do this, one right here you had 1055 milliliters, and i asked you no today's not about, review, gabriel gabby we will finish chapter, three in just a second i just need to, address this because, you may have to type an answer in this, way on the exam or future assignments, the way i had you do it for the dry lab, so let's convert it to centi liters, milliliters to centiliters so first off, we need a relationship i know that a, thousand, milliliters equals one liter and i know, that a hundred centiliters equals one, liter, okay so because these both equal one, liter they equal each other, so a thousand ml equals a hundred, centiliters you can simplify this if you, want or you can use this relationship it, does not matter if you simplify it, it's just that 10 ml equals 1 cl, okay so now let's do the problem we have, i'm going to move up here, one zero five five i'm going to turn, this sideways, ml we want to cancel out ml okay i'm, just going to use this one right here, this relationship, so there's a thousand milliliters for, every 100, centiliters and then you you cancel out, milliliters, and you divide by a thousand and, multiply by 100 or in essence you're, dividing by 10, so it should be 105.5 cl, on the dry lab i said okay you need to, report this number in scientific, notation, you needed to report all your answers, for this problem in scientific notation, so we need to make this number 105.5 a, number between 1 and 10 right because, that's the rules for scientific notation, so to do that we're going to move the, decimal, two places to the left, now we have 1.055, and then remember our decimal moved two, places left so the exponent, increases by two so that should be times, ten to the power of two, so this is the number in scientific, notation and then i gave instructions, that people use the shorthand letter e, okay and e, is gonna stand for this portion right, here okay, e and then you're just going to type, your exponent so the way i wanted you to, enter this in blackboard was, 1 and i told you 3 decimals i've told, you how many decimal places for each, if i tell you 3 decimal places i talked, to someone yesterday who thought you, only put the decimal places in, no you still have to put the number, that's left of the decimal place, you still have to put your base number, but i'm just telling you, to the right of the decimal how many, digits to go and i said i want all three, so, it should be one point zero five five e, two because it's a positive two on the, exponent if it was a negative two, exponent you would type negative two, so this is how i wanted you to enter, answers into blackboard, okay um i'm kind of deciding what to do, i'm trying to assess this problem and, see how many people just bombed it and, how many people, did it correctly and i'm gonna make a, decision on that, um as to whether this problem is just, for credit or extra credit, on the dry lab okay so your grade might, get adjusted i'm not making any promises, on that yet, i haven't decided what i'm going to do i, need to just assess further how many, people, did not do this correctly okay i know, that was a lot of instructions and, here's what i also know, you guys can work your tail off on an, assignment and spend a lot of effort and, a lot of time, and then you feel nervous because if you, just type it in one little thing wrong, blackboard counts you wrong i get that, and i hate it just as much as you do, okay this is not how i'd prefer to do, chemistry okay so don't think that i, want it to be this way i hate it for you, guys and i really do try to imagine, an account for all the different, possibilities and way people will accept, or type in answers, and and spend the time on the front end, when i design the assignment, so that you guys don't have to worry, about do i put a space or no space do i, capitalize or not, okay so i try to account for those, things um if you ever have questions on, a lab assignment about your grade just, email me, i'm happy to look into it for you i just, don't know to look at it unless you, email me all right, questions on that okay we've got to move, on because we got a lot of other, i'm gonna go back to my note so that is, this one check okay i posted the key by, the way, if you go into the labs folder now if, you want to see how i worked all the, problems on the dry lab out, ignore the fact that there's point, values next to each problem that's for, tas they've graded these things in the, past, but you can see how i worked everything, out so so look at that and you can use, that to prepare for the exam, all right discussion board questions, there was some great discussion how many, responses did we get we had, 77 responses 77 people getting bonus, points that's wonderful, okay so let's look at these the first, question on the discussion board so i'm, not going to be able to actually i'll, just share my screen, you're not going to be able to see, anybody's responses i just want you to, see what i'm looking at and we can talk, through them, good lord, all right share screen, to my desktop now, there we go okay okay can y'all see i, don't know what y'all can see can y'all, see the discussion board questions, okay so um number one, right here formation of a precipitate, involves a chain, a change from things that are liquid to, forming something solid so why is this, considered a chemical change and not a, physical change, all right um how is formation of a, precipitate different, from the process of freezing in which a, change from liquid to solid occurs, um what what would a substance that, freezes be considered a physical or, chemical change okay so a lot of, questions there, first off formation of a precipitate why, is it considered a chemical change, can anybody answer this why, precipitation, formation of precipitate is considered a, chemical change and not physical, even though we're just having things, that are liquid mixed together and we, form a solid, the chemical makeup changes yes thank, you, okay new product the precipitate is a, different compound, okay it is a different compound so the, chemical composition has changed, that's why it's a chemical change all, right um how is formation of a, precipitate different from the process, of freezing, who wants to share that a lot of people, responded so who wants to say with what, they said on that, the process of freezing is just the, change in matter the chemical, makeup of it doesn't change right so, the arrangement of the molecules solids, things are held close together, liquids things are spread more apart, gases things are spread even further, apart but the chemical identity the, compound or the element does not change, okay now i saw some people said um there, was one response that, um because oh what was it i have it, right here, i wanted to address this freezing, involves a temperature change so it's a, chemical change somebody said that they, said freezing, involves a temperature change okay, you're getting colder or you could apply, that to melting, melting involves a temperature change so, it's a chemical change that's not true, think words like melting freezing, boiling evaporation, these are physical changes okay yes, maybe you apply heat, to melt something but you've not changed, the chemical identity okay, when you a temperature change means that, you, are roasting or cooking or combusting or, burning, something okay words like burning, roasting combusting exploding, those are all chemical changes but, melting, or things that do sound like they, involve heat, okay you have to assess is the chemical, composition of my, original compounds changing or staying, the same all right, um okay so something that freezes, is a physical change all right number, two right here consider the process of, dissolving a packet of sugar into some, hot coffee or tea is it a physical or, chemical change most everybody got this, correct, but dissolving something is just a, physical change, the sugar molecules are large crystals, we can see sugar molecules but when you, put them into your hot coffee or tea, they dissolve and they spread out but, the sugar itself has not changed that's, why your tea or your coffee tastes sweet, because the sugar molecule stays intact, we don't change that molecule we don't, change the chemical composition of the, sugar, or the coffee even though it has a, different taste we've just mixed two, things together so that's a, that's a physical change and so, dissolving is not a chemical change, lastly number three, currently when my daughter asks for, juice i fill a cup halfway with the, apple juice and then dilute it with some, water, don't judge me she doesn't need all that, sugar um, what does a physical or chemical change, occur when i dilute the juice of so, which one, this is a physical change adding water, diluting something, is a physical change okay we again we're, not changing the chemical composition, so i wanted to go over those answers for, you guys basically the point of this, discussion board was to let you know, diluting and dissolving things are, physical changes not chemical, all right so hopefully you feel good, with that and, now we're going to go back to my the, ipad and we're going to get into lecture, any questions so far, on um everything we've talked about i, know that was a lot, so if you were glazed over just then i, will post the recording of this later, and you can catch up on anything you, miss but we need to go into lecture, and i need to scroll up, okay this is where we ended off last, thursday last week, and now we are just going to finish, chapter three and then, we'll do some review at the end so, we talked about ions we and you guys we, wrote these out, um how to write out the symbols for ions, i call this a symbol because it's just, the elemental symbol in the charge, we also looked at how to write out the, names a little bit with roman numerals, with transition metals but that's what, we're really going to talk about today, okay when do you write the name when do, you write the symbol how do you write, the formula for a compound which, involves more than one element, i'm going to skip over this practice, problem because we're going to do, something similar to this in our review, today, so the title of this slide is writing, the names of cations, so first off writing the full name of a, cation and writing this symbol for a, cation is different, the symbol is what you do is is like, this you just write the elemental symbol, in the charge the name as you can see, is the full name of the element okay so, they're different if i tell you to write, the symbol, for the ion or if i tell you to write, the name know what i mean, okay so how do you do this well first, off for cations we have two different, kinds of cations, we have main group cations, so what groups are main group cations, found in can anybody tell me, what groups are main group cations found, in, on the periodic table, main group cations, 1 2 13 through 15., um so we're gonna so so main groups are, just it'll be one two and three, elements in main groups one two and, three if we scroll up right here, this is main group one with hydrogen, this is main group two and then you skip, the transition metals they're not main, group metals right, so you skip over to oh that's a two skip, it over to three with boron and aluminum, that's main group three, all right so we're gonna name these, differently than transition metals, which is everything down here these are, all the transition metals, so we're talking about main groups and, all you do is you name the element and, you put the word ion, it's that simple you name the element so, for example k, plus will be the potassium ion magnesium, and aluminum on, we do not use roman numerals no roman, i'm just going to put the numbers on no, roman numerals, for main group elements because their, charges are predictable, they only form an ion with one kind of, charge, unlike transition metals and we saw, thursday sometimes transition metals can, form different charges, questions on that all right now let's, talk about the other kind of cation, which is your transition metal cavity, and these because sometimes they can, form different ions with different, charges, um excuse the the old name here, this is just kind of a latin form of, stuff and we're not going to use that in, this class so i'm just going to focus on, the new naming system, there may be times you see the old, naming system on the internet if you're, reading about things or, different places but we're going to use, the new naming system so you name if, you're going to name it you put the, element name, so cr2 plus this is the one we're, talking about right here this is, chromium, so we would write out the element name, chromium it's a two plus, and sometimes chromium can be a three, plus right you see over here so we've, got to differentiate, are we talking about the plus two, version or the plus three version, so we're going to put the roman numerals, for two and if anybody's unfamiliar with, roman numerals you just do a, a one slash for a one two slashes for a, two, three slashes for a three and then a one, and a v, indicates a plus four okay, so if we're talking about the chromium, three ion over here on the right, again you name the element chromium, roman numerals for three, and then you put the word ion this is if, we're naming an ion or if we're, we're writing um whether transition or, or main group okay questions on how to, name cations that's it that's all the, rules for cations, all right anions, okay what is an anion is an anion, something that gives or receives, electrons, receives yes thank you bailey receives, so these things are negatively charged, the way we name them, these are all found mostly mostly on the, uh, right side of the periodic table okay so, main group six and seven, sometimes main groups five six and seven, so, you see halogens all right bromine, chlorine, bromine chlorine fluorine iodine these, are all your halogens, um oxygen and sulfur our main group, six these are all main group seven, so there's the symbol for all these ions, but the name is what i want to teach you, how do you name these, um you you write the name of the element, but you change the ending, okay notice the last three letters i'm, going to underline in all these cases, are ide, ide ide so when you're naming an anion, you change the end of the, element name to ide okay, i d e so bromine, the element bromine as an ion becomes, the bromide, you put the word ion bromide ion, chlorine as an ion an anion becomes the, chloride, ion oxygen we take off the last half of, that word it's now the oxide ion, and then sulfide same thing okay so, that's how you name anions, that's the only rule change the name, ending to i then you put the word ion, questions on that, all right so this is how you name ions, now we're going to talk about how you, name, compounds after i forgot we got to talk, about polyatomic ions, somebody asked me about these and maybe, i think they put a picture in the groovy, or are going, you have polyatomic ions that you need, to memorize for the exam, and it's these 11 okay because i very, well could ask you, to name a compound that has a polyatomic, ion in it, and if you don't recognize the, polyatomic ion you're not going to name, it correctly and you'll miss points for, that, okay so when i say know it i want you to, know both the name so for example this, first one, know the hydronium ion if i say, hydronium bromide or something like that, you would need to know this formula h3o, and that it has a plus one charge you, need to know the formula, and the charge on that formula and you, also need to know what name corresponds, with that, okay so there's 11 of these, i'm telling you things will be a lot, easier for you on exam one if you just, memorize these because you will need to, recognize them for naming compounds, naming ionic compounds okay, questions on these, all right it's just it's rope straight, rope memorization, okay now let's talk about compounds how, is a compound different than an element, can anybody tell me, remember we got a classified matter, elements and compounds are different, there's more than one like element, yes okay more than one element now, going back up here if i'm looking at, these polyatomics there's more than one, element why aren't these compounds, we're still calling these ions why is, this not called a compound if there's, more than one element, because they're char they have a charge, they didn't like, cancel out you're charged okay so, compounds, that brings up an important point, compounds are neutral, overall they have no charge if there's a, charge it's an ion, but if it's a neutral it's a compound so, all ionic compounds have to be neutral, okay now ionic compounds generally form, between a metal, and your metal will be your cation, whether it's a main group medal or, transition and a non-metal, remember how we divided up the periodic, table into yellow blue and purple colors, we looked at that on the adams periodic, table lecture, and i showed you which elements all were, metals which ones were metalloids and, which ones were non-metals, so you pick a metal and you pick a, non-metal and you can get an ionic, compound, these are your anions the non-metals, so for example here's two here's two, examples here, um the first one we've got potassium, ions, k plus is k is potassium and, f minus this is fluorine so when you put, these together, you make the compound potassium fluoride, you got your metal which is your cation, and your non-metal which is your, fluorine, fluoride ion number two, calcium oxide okay we've got uh the, calcium, metal and we've got the oxygen non-metal, and together they make the ionic, compound calcium oxide, okay um notice and we'll again we're, going to go over these rules but the, the metal the cation always comes first, in these two examples and every time you, write it on a compound the metal the, cation always comes first all right, and then the nonmetal comes second, all right let's look at what's happening, remember this is all due to, transfer of a valence electron okay the, cation has given away a valence electron, the anion has received that valence, electron, sometimes it's just the transfer of one, valence electron but oftentimes is, the transfer of two or three valence, electrons, so let's look at potassium and fluorine, potassium is main group one so it's got, one valence, fluorine you see the seven valence, electrons here on fluorine, so this one valence is going to go to, fluorine and when you get done now we, have the k, plus ion remember you could write it you, could understand, underneath the first shell now it has a, full set of eight but it's more commonly, accepted to write, group one and two elements um that, become cations, with no valence electrons and you just, write their charge on them, okay when they become ions so k, does not have eight dots around it it, has no dots around it, um and then fluorine has a full set of, eight in its outer shell because it, received that one from, from potassium now it's got a minus, charge all right calcium guess what main, group two there's the two valence it's, ready to give both of those and, oh it just so happens that oxygen wants, to get two, oxygen has six valence and it wants to, gain two more so this is a perfect, perfect agreement calcium's happy to, give two away and when it does so, it becomes the plus two cation and then, oxygen receives those two, and it's now got a full set of eight in, the valence shell and now it's a minus, two anion, okay so all of this stuff is stuff we, talked about last week, and now i'm just showing you the full, reaction picture so if i were to ask you, to write out a reaction, show the electron dot structures or the, electron dot symbols of your, elements and then your ions as products, this is what i would mean okay, you write out a reaction like this, okay so how would we write the names for, ionic compounds, what if we switch some things around, what if potassium is going to bind up, with oxygen okay we got a metal and a, nonmetal we can form a compound out of, this, but here's what i know potassium only, wants to give away one valence electron, oxygen wants to receive two, so what what do we do how can we make a, compound out of this, potassium only wants to give one valence, oxygen is not satisfied, until it gets two you need two potassium, that's correct you need two, potassium ions okay so we're going to, put a two here, and now we can each one can give away, one and so we'll form two potassium, ions now oxygen will have a full set of, i guess i should do these other ones in, black to show the ones it originally had, had six originally it gets two more, and now overall it's a minus two right, and you see how if we write the compound, for this we would just write k, two o, and everything adds up to zero we've got, two plus charges and one minus two, charge, and everything adds up to zero so that, means the compounds neutral overall, right um oh i think i was just going to, write that down here, k2o, how do we name that great question, bailey after we examine this slide we're, gonna we're gonna talk through all the, rules for naming, i'm gonna teach you how to name, compounds um, you're gonna name the ions but you drop, the word ion so this one would just be, potassium, oxide right see how we've still denoted, this as an anion, by naming ide but you don't say, potassium ion oxide ion, because now we have a compound okay so, it's just potassium oxide you drop the, word ion, we'll walk through some rules with that, okay what about with calcium and, chlorine, now it's the same problem but it's from, the anion side the anion here, well chlorine is not an anion yet but, chlorine only wants to receive one, valence, and calcium's like no you've got to take, both i've got to get rid of two, so how do we solve this dilemma if we, have two, chlorine atoms now each chlorine can, accept, one uh or so what am i trying to say, electron one electron from calcium and, both of the calcium valences valence, electrons can be given away, and you get c a two plus you can write, two plus or plus two doesn't matter if, the two or the plus comes first, and we get chlorine is now, going to have well we'll have two of, these i'm going to leave i didn't leave, myself enough room, so we'll have two chlorine and here's, all the valence now that chlorine is, going to have, and one of these was given to it from, the the, calcium so now this is going to be a, minus but we have two of them, uh because each chlorine atom accepted, once we get two chlorine anions, so calcium and chlorine how would you, write the formula for the compound, overall, how would you write that, we've got one calcium cation and we've, got two chlorine anions, just like we did for the potassium oxide, right here how would we how would we, write the formula, for calcium chloride yep i'm seeing it, in the chat c, a c l and we gotta we gotta remember, we've got two chlorine anions here so, we're going to put a 2 down there, that looks like a g we've got to fix, that, cacl2, so in that situation the only thing that, changes is the two in front of it right, not the charge correct, we're only changing the number of anions, we form not the charge we can never, change the charge, remember these things are predictable, when they're set the only time you can, have different charges on stuff are, transition metals, okay they can have different charges, chlorine will always be a minus one so, don't ever tell me chlorine will be a, minus two, it's just that you have two chlorine or, chloride anions, each one is a minus one great question, rachel, so how would we name this it would be, calcium, chlor ide chloride calcium chloride, not calcium ion chloride ion it's just, calcium chloride, all right any questions on this stuff, i'm going to teach you something you're, going to run into some questions on the, chapter 3 homework, that this is going to be helpful for, some of you have already already done it, and you've kind of figured it out and i, think that's great but in case you've, not done that yet, i'm going to teach you something called, the switch trick sometimes people look, at charges, and it's hard to figure out okay how, many cations and how many anions do i, need in my formula for my compound, overall, and the switch trick is going to help, you for that so we are going to make, this compound right down here it's, called magnesium phosphate, phosphate you probably don't recognize, it because you're new with polyatomics, but phosphate is a polyatomic ion, all right po4 it's all one unit, so we're going to look at the charges, on the anion and the cation before we, put them together in the compound, okay so the charge on this ion what is, this ion this ion is the, anion the charge on your anion on, phosphate, is a negative three all right and the, charge, on this ion which is the cation, for magnesium is a plus two okay we got, a plus three and a plus two or minus, three and a plus two, how many cations how many anions do we, need to get a neutral compound overall, so what that means is the amount of, positive charge and the amount of, negative charge they have to add up to, zero, so we do the switch trick what that, means is the charge on this anion on the, anion is the same as the number of the, other ion okay which is the cation in, this case so that means we need three, cations okay, so the charge on your anion matches the, number of cations you need in the, formula, we call this the switch trick you're, switching the number the number for the, charge in the anion becomes the number, of the subscript of cations you need in, your formula you see that, and then the charge on the cation is the, same as the number of the anion, we need two phosphates so, let's double check ourselves does this, add up to zero well, we have three magnesiums and each one, is a plus two right we got three of them, i'm looking at this subscript here, each magnesium from the blue up here is, a plus two so i'm gonna do three times, plus two i got three of them each one's, a plus two so that makes, plus six overall that's how much, positive charge we have, okay what about phosphate phosphate um, we've got two of them all right i'm, looking at this subscript here the blue, two, and i've got each one is a minus three, so i'm gonna do three times, or sorry two times minus three and that, adds up to, negative six and plus six and negative, six, all add up to zero which is neutral so, this is a neutral compound so this is, the switch trick, the only other thing you have to do is, you have to make sure, um everything is simplified right, so you cannot simplify three and two, that's as simple as it gets but if you, had like, m g six p, o four four this would still be balance, charge neutral, but these subscripts right here can be, simplified how can they be simplified, they can both be divided by two right, and that's where you get the three and, the two okay so ionic compounds must be, written as a formula, unit and that's, what we just kind of derived it's the, simplest ratio between the cation and, the anion, with the smallest possible it's neutral, overall okay smallest possible neutral, unit, so just make sure you simplify in the, end, okay questions on what we just did we're, going to practice a lot of this stuff, okay because this stuff is the newest i, encourage you to spend a lot of time, this afternoon and tomorrow, on on this stuff hopefully over the, weekend, you spend a lot of time on chapters one, and two and now you can mostly spend the, remaining time, preparing for the exam by spending time, on chapter three, all right here's the rules for writing, compounds, we've addressed a few of these things as, we've gone but here's just, if you want a page to come back to again, you can use the, your notes and your lecture slides on, the exam write the cation, first and the anion second, okay remember the example there earlier, with like calcium and oxygen, you should write c a o not, o oca okay not that one, the metal which is your cation comes, first, the non-metal which is the anion comes, second, rule number two do not include the, charges, on the ions and again this is for when, you write compounds if you're writing, ions you can, you gotta include charges but when you, put them together and form compounds, you delete the charges so we we write c, a o, not c a two plus o, two minus we can deduce the charges from, what we already know about ions and, their organization on the periodic table, so we don't have to write those when we, write the compound overall, okay rule number three use parentheses, around the polyatomic ion, formula if it has a sub, script meaning, you need, or have more, than one polyatomic in your formula, i'm going to read this again you've got, to use parentheses around your, polyatomic ion, formula if it needs a subscript meaning, you need more than one so for example, when we did the magnesium, phosphate we had three of these po4, is phosphate that's a polyatomic ion and, i needed two of them, if we don't include the parentheses look, what happens mg3po42 now it looks like, you have 42 oxygens in your, formula which is not not gonna happen, and that's not correct we need two, phosphates not 42 oxygens right so it's, not this, um same thing if we had aluminum, hydroxide, aluminum is a plus three cation so we're, going to need three hydroxides, you don't have to know this right now, i'm just writing an example for you, it would be o-h and o-h-h-o-h is a minus, one so we need three of them to balance, that aluminum cation, and so if you only write a l, o h3 this is incorrect because it looks, like you have three hydrogens, and you need three hydroxides not three, hydrogens, you need three of the entire unit so the, parentheses indicate, everything within the parentheses is, multiplied by three, okay questions on this i gotta turn my, space heater off, okay questions on this, all right um let's keep going so, now i want you to practice, i want you to take these ions i've given, you the name of the ions, not the symbols by the way so this is, even more challenging because you need, to first i encourage you to write out, the symbol with the charges for the ions, then put them together and write the, compound and we're going to name that, compound, so give me the formula and the name of, the compound, so we got sodium ion and chloride if you, have a periodic table grab that that's, going to help you, i'm going to work the first one maybe, first two with you, sodium is n a, that's main group one so what charge, should we have on sodium, positive positive one thank you chloride, is is main group seven chlorines main, group seven so it only wants one valence, so it's a cl with a minus one charge, as an ion so we're gonna put these two, things together, how many sodium cations how many, chloride anions do we need, for it to get a neutral compound for, everything to add up to zero, how many cations how many anions, there's nine thank you maria one each so, we just need nacl, so that's the correct formula now let's, name it, we just drop the word ion here we don't, have any transition metals we don't have, to worry about, roman numerals so it's just sodium, chloride we don't have any polyatomics, here so it's just sodium chloride, okay i'll give you a hint if some of, these again this is why you have to know, your polyatomic sulfate is a polyatomic, bicarbonate is a polyatomic phosphate is, a polyatomic ion, so if you want to know how to write, these you need to go look at your, polyatomic ion chart, these are three of the 11 that i ask you, to memorize, so iron three ion what is that iron is f, e and we see from the roman numerals it, tells us what the charge is so this is, going to be a plus three, sulfate can anybody tell me sulfate is, so4, can anybody tell me the charge on, sulfate it must be the anion so it has, to have a negative charge because it's, second, remember thank you brooklyn, we always write cations first and on, second so, i want you to try the switch trick if, you need to, remember the rule i'm going to scroll up, for just a second number three, we've got a polyatomic here so if we, need more than one we've got to use, parentheses, so there's a lot of rules coming into, play with this one we've got a, transition metal we've got roman, numerals, we've got a polyatomic there's a lot of, different rules at play here, anybody tell me what you got, i'm gonna write my cation first fe how, many cations do i need how many irons, two yep you can always do the switch, trick so remember, when the charge on here it becomes the, number, of irons that we need so we're going to, do two and then i see ashton said and, grant said fe2, and then it should be so4 and you've got, to put parentheses around that because, we need three of them, okay, and when you double check does, everything add up to zero it does, okay how do you name this well here we, cannot lose our roman numerals it's, going to be iron, iii, sulfate you just drop the word ion, that's it you keep the roman numerals, because it's a transition metal, why did we not have roman numerals for, sodium it's a main group cation not, transition metal, okay now we have sodium ion plus the, bicarbonate ion, again we wrote sodium earlier so it's, just in a plus, bicarbonate this is a polyatomic so you, need to look at your polyatomic chart, it's also known as the hydrogen, carbonate ion but i call it bicarb, bicarbonate so if you see bicarbonate i, would encourage you to be more familiar, with that name, that's more of the medical term for it, too this is h hco3, minus minus one, so putting these together how many, cations and how many anions do you need, for overall your compound to add up to, zero, i'm looking at the charges when i, consider this i got a plus one and a, minus one, so if i just have one each, it should add up to zero n, a h so if i just need one, of this polyatomic do i need parentheses, do i need to write this, one no i don't just writing the, polyatomic is good enough itself so you, don't need, the parentheses there, okay so how do we name this, just drop the word ion we have no roman, numerals here because we don't have any, transition metals so it's sodium, bicarbonate, all right last one we have ammonium whoa, this one's also polyatomic i didn't see, that earlier, ammonium is also a polyatomic and, phosphate we have two polyatomic ions, here, so there's we might need a lot of, parentheses i don't know we'll see, what is ammonium, nh4 yep nh4, and it's got a plus charge thank you, sarah, phosphate we looked at phosphate a, couple slides ago when we learned the, switch tray, so if you remember that one it's po4 and, it's got a minus three overall, so we got to write a compound that's, neutral we got a we got a plus one, and we got a minus three so what can we, do to manipulate these numbers to make, it add up to zero we gotta have, three of these okay three times plus one, adds up to, uh plus three and then a plus three and, a minus three add up to zero, so that means i need three of these, remember you can always do the switch, trick, thank you ashlyn i see she wrote the, formula for us nh4, i'm going to need three of them so guess, what i got to use parentheses here, that three indicates i have three of my, ammonium ions, and then you got po4 we only need one so, we do not have to use parentheses on the, phosphate, because we just need one, and then that we've already made sure, that added up to zero so then how do we, name this we just drop the ion, word ion ammonium, phosphate, okay pretty good practice, you're going to have to do this on the, exam for sure, questions, um there's a lot more practice problems, here and i don't have a paw i didn't i, did not have time to throw that in, so that's from an old lecture um, but i did want you to remember how to, name ions and, write the symbol so this is more, practice i'm trying to look at the clock, i want to make sure we have time to, um do some review and this kind of is, some review of what we've gone over so, let me see what we have left, this is again just a lot of practice, here so what i'm going to do, i may make a video and walk through, these practice problems and post that to, blackboard later today or tomorrow, but i want you to attempt these things, on your first first on your own, we're going to hit one more so i'm going, to skip over these practice problems, i'll make a video on how i walk through, them, attempt them on your own since you now, have all the skills to do that, we're going to talk about a couple, properties of ionic solids and then, we're just going to spend the rest of, the time reviewing, i wanted to save like 20 minutes or so, for review, okay properties of ionic solids so this, whole chapter has been on ionic, compounds, ionic solids which is formed by the, trading of electrons and ionic bonds, all right so we've got some unique, properties of scientists to study ionic, compounds that we've noticed, um they form what we call crystalline, solids, crystalline solids okay, um we call them crystalline because like, example a sugar molecule it looks like a, little teeny tiny crystal, salt molecule uh it looks like a a teeny, tiny, crystal okay we do not call them, molecules i just use the word molecules, didn't they we call them crystalline, solids, and as you're around chemistry for a, long time sometimes these rules, get blurred and blended but that's the, proper name is, ionic compounds are not called molecules, they're called crystalline solids, some ionic compounds dissolve in water, and they form, solutions that are good conductors of, electricity, so you've got sodium and chlorine atoms, remember, when things become a cation, they are smaller so the the purple, sphere is smaller as an ion and when, things become, anions they look a little bigger, so you see that change in size when we, put all these together in a crystalline, arrangement, we get this nice ordered arrangement, like this, and these sodiums the positive charges, surround themselves with as many, negative charges as possible, and same the negative charges surround, themselves with as many positive charges, as possible and you get this nice, ordered arrangement, and that's why you see these little, crystals down here if you zoomed in, and you could see the size of the atoms, they would actually be ordered and, arranged like this, and because we have ions in solution, those things, they're not great conductors of, electricity but weekly weekly they can, conduct electricity, okay ionic compounds do you think, they're going to have high or low, melting points what do you all think, and boiling points high or low melting, or boiling points, looking in the chat high high that is, correct they have very high, melting and boiling points why is that, ionic bonds are really strong, because you have a full positive charge, and a full negative charge and remember, opposites attract, so there's a really strong attraction, between the cation and the anion, other bonds we're going to see later in, chapter four after exam one, we don't have the full positive and, negative charge they're sharing, electrons they're not totally, giving an electron away or receiving it, so ionic bonds are really strong, and when you have strong bonds holding, molecules and holding compounds together, it takes a lot of energy takes a lot of, heat to break them apart, okay so to to melt them or to boil them, okay so they have high melting points, and boiling points and then ionic solids, shatter when forcefully broken, okay glass glass is on compound, we know glass shatters when it's broken, just an example, all right um and i don't have polls, today because i, i wanted to focus on review so, um keep that in mind, that's a little bit about ionic cells, any questions on what we talked about, today, how to name compounds how to name, formula, right formulas for compounds and, a few properties of ionic solids, all right well let's get into some, review i want you to grab it oh, question i'm sorry yeah i got a question, about um, the writing like the last ones we did, i don't know i saw the last one was like, we ne we didn't wait game yeah james, troll wedge, this one right here ammonium phosphate, yeah, when do we still have like iron in name, and when not when you're writing the, compound, okay compounds are the combination of a, cation and an anion, so when you write the name of a compound, you do not include the word ion, when you're just writing if you're just, writing the name of an ion, you do include the word ion does that, help zoe, yeah okay good deal hey please remember, i'm asking you guys to all have your, video on, um during lecture okay, thank you thank you for joining us, all right um get some blank paper, we're gonna have some review it's gonna, be timed, it's gonna feel high pressure we're, gonna simulate the exam, okay get a blank sheet of paper out and, get a calculator, i see some of you just looking at me i'm, for real, we're about to get started i'm going to, time you on these problems i'm not, trying to make your blood pressure go up, i am just trying to help you prepare, okay, i think it's good sometimes to work, under a clock because that's how the, exam is going to be right, all right so the first thing we're going, to do, i'm going to give you a few minutes here, we go we're going to get started, you have two minutes i want you to, predict, i want you to write down nine topics or, concepts from chapters one through three, that you think will be on the exam they, can be as specific or broad, as you want them to be nine concepts, nine topics from everything we've talked, about, okay so i'm going to start the clock, go, if you can do more than nine do more, okay you're a minute in give you one, more minute, nine topics or concepts what do we talk, about chapter one, what do we talk about in chapter two and, then even things from today from chapter, three, okay 20 more seconds, you can go above nine do it, okay we're about to move on, all right stop let's keep going, classifying matter i want to know write, down in simplest but, concise but specific words what is the, difference, between a heterogeneous mixture and a, homogeneous mixture, give an example of a heterogeneous, mixture and i'm homogeneous, you don't have to write a paragraph here, but do try to be specific, give you less than a minute for this, question, okay about 15 more seconds, again i'm not trying to make your blood, pressure go up it's just good, this is good to wreck your brain, all right let's move on, classify each of the following is either, a chemical or physical change, freezing a popsicle roasting a, marshmallow bleaching or coloring your, hair, so literally just go through boom boom, boom you can write one two three, physical, chemical physical you do not have to, write down the the words, we'll come back to these, just write one physical or chemical two, physical or chemical, three give me about 12 more seconds, i'm seeing some questions in the chat i, will answer those once we get through, all this review stuff, all right you should have that do you, feel like we're moving fast we are, i want to get through it though we'll, come back to this stuff we'll answer, these questions all right next one let's, get some math grab your calculator, how many micro liters are in 1.78, kilo liters, so you need a relationship here, remember what's the abbreviation for, micro, all right you're about a minute in i'm, going to give you about 30 more seconds, this should be a one or a one or two, step conversion not a lot of steps here, but you gotta know your prefixes, if you get done with that one move on to, the next one, all right i would say you should be, wrapping up with that first one, or getting close go ahead and start the, second one report the answer to the, following problem in scientific notation, 2.03 times 10 to the power of 11 times, 7.44 times 10 to the negative 3., so what are the rules for multiplying, numbers in scientific notation, we're like that's a great question and i, don't remember, about 30 more seconds and then we're, going to move on, we're going to work on this till 905 get, as far as we can and we're spending the, last 10 minutes going over this stuff, all right if you're not done i know this, is in a rush but we i want to get, through it so we're going to come back, i'm going to move on, a little word problem here dr michael, prescribes 300 milligrams a day, of medicine to a patent to a patient, let's just say patient, each pill has 1.5 times 10 to the minus, or 10 to the positive five, micrograms of medicine how many pills, will the patient need for seven days, i know microgram i don't think is one i, ask you to memorize, so i could have told you this on the, problem previous maybe some of you, looked it up, but there is 10 to the power 6 microgram, and 1 gram you're like well now you tell, me, i can be nice when i want to be, so how many pills will you need for, seven days, do you want an answer with units of, pills, give you about 40 more seconds this, one's got a few relationships in it, again just give it your best shot we're, gonna walk through all these, this is probably the last one we have, time for, i think upon these, all right we're about to wrap up, i've given you about two minutes on this, problem, a few more seconds and then we're gonna, spend some time on review it's 905 so, i really want to go through these and, have time to do that, all right we're going to stop so i'll, tell you, how you feeling i think i bomb these, um questions from the chat really quick, on the exam will we have conversion, factors yes we will, rachel i can't remember the exam mostly, multiple choice it will be a portion, multiple, choice you'll probably have anywhere, from 10 to 15 multiple choice questions, each multiple choice will be worth three, points so a third to, close to a half the exam may be maybe, multiple choice, easy exam open note anybody want to, answer that, yes yes it is you're like praise god, okay okay i had more review we could, have kept going, and then time time got us okay so um i, will post all these slides and you can, you can work on these questions as a, review as well i haven't had a challenge, problem, this is a huge problem this is like a, seven or eight step problem and this is, my real life by the way, newborns and formula versus, all that so um i'll post this this can, be for practice, um if anybody wants to join my office, hour today we can work through some of, these, all right let's go back up where did we, start nine topics, let's name them in the chat, uh would you say there's gonna be a lot, of those, challenge conversion problems on the, exam a challenge or conversion problem, probably gonna be like an eight to ten, point problem all right, now that's why i'm going to have you, take a picture of that one and upload it, so there's probably just going to be one, of those that are at least you take a, picture and you upload it, so probably a good 10 points and i give, partial credit, so if you got half of it right you just, didn't know how to finish i'll give you, as many points as i can, that's why i need you to show me your, units okay if you don't show me units i, can't give you points, um so anyways there will be one at least, one or two of those okay we got to get, through this, nine topics anybody want to help me, bless your soul, valence electrons, i'm thinking about chapter one we had, signs, of a chemical change y'all are blowing, up the chat polyatomic ions i can't keep, up with all this specific heat okay, specific heat we had temperature, conversions, we had to classify matter, as a element compound heterogeneous, homogeneous, okay we had signs of it this should say, chemical change by the way, um i wish i was writing smaller so, that's one two three four, five um we looked at okay uh don't, atomic theory, that was chapter two uh we look at, subatomic structure, subatomic particles sup, should be sub, okay um protons electrons neutrons how, they're arranged in an atom, um we so yeah specific heat remember you, had cow, i see this in the chat calories and, joules okay units of those, things density don't forget density, that was one thing we talked about oh, what else, um ions and, ionic compounds ionic bonds we talked, about how to, name ionic, compounds, right how many is that one two three, four five six seven eight nine ten, okay that's at least nine so we could, have kept going there's even more, um but i think this gives you an overall, general view hopefully the point of, today, was for you to say oh gosh maybe i'm not, where i thought i was, maybe there's some things that i see, that i'm weak on and that's the point i, want you to tonight and tomorrow, spend your time focusing on the things, you know you weren't good at, classify matter what's the difference, between heterogeneous and homogeneous, mixture, anybody want to help us, both have more than one thing in it okay, but homogeneous, is even throughout, okay you could say they're mixed evenly, good example would be vanilla ice cream, all right every bite's the same sweet, tea every drink's the same, heterogeneous is not evenly, [Music], mixed you could say unevenly mixed, my writing is really good when i'm in a, hurry, not evenly mixed okay what's an example, of this, i'll put black coffee with creamer, uh coffee with creamer hopefully when, you mix that though it's mixed evenly, cookies and cream ice cream, e s is it e m e, okay vegetable soup would be one you got, a bunch of different things in vegetable, soup, every bite's different sand and water, ashton that's a good one, okay all right that's that's that one, we're gonna move on we got five minutes, okay freezing a popsicle physical or, chemical, physical keyword yes so physical, roasting a marshmallow key word roasting, physical or chemical, chemical yes the appearance of that, marshmallow looks different you have a, burnt, substance now on the marshmallow that's, a new compound, bleaching coloring your hair keyword, bleaching, chemical yes, chemical change okay, questions on that, okay how many micro liters in 1.78 kilo, liters well i know there's 10 to the six, microliters in one liter and, um we know that one liter i'm going to, write it this, way if you don't like this way there's, different ways you could do it actually, i'll write it the other way, the way i taught you guys is that there, is a thousand, liters in one kilo liter, so now we're going to start with 1.78, kilo liters, we want to cancel kilo liters so i'm, going to use this relationship, cancel and, now i want to get to microliters so i, want to cancel liters, and there's a million microliters there, so, liters cancel what's our answer here, 1.78 times, 10 to the nine essentially you should, get 1.78 you could write it like this, times 10 to the nine, is that what y'all got, okay that's what you should have got, questions on that, you see how we're just canceling units, you got to have these relationships, these are key and then you just start, with the number given, cancel the units till you get to the one, you need, okay uh report the following problem in, scientific notation, so when you're multiplying numbers in, scientific notation what's the rule, you multiply the base numbers okay your, your digits and then you're going to add, the exponents, okay so we're going to add, the exponents, so what is 2.03 times 7.44 what'd you, get 15.103, 2.03 times 7.44, whoops 2.03 times 7.44, yep 15.10 and then, times ten we're not down we're gonna, have to adjust that because this is not, a number between one and ten, so then we're gonna add the exponents, eleven plus, negative three is eight, so now we gotta make this a number, between one and ten we gotta move the, decimal, one place to the left and we get one, point five, one zero so then times ten we moved it, left so the exponent increases this, becomes ten to the power of nine, review the rules and that's another, topic scientific notation, we talked about that so make sure you, feel comfortable with these kinds of, problems, oh we got one minute last problem think, i can do this in a minute, dr michael prescribes 300 milligrams a, day of a medicine to a patient, each pill has 1.5 times to the power 5, micrograms of the drug or the medicine, how many pills will the patient need for, 7 days i'm going to write out some, relationships we got 300, milligrams of the drug i'm gonna do d, for drugs equals one day, um we i know there's seven seven days is, a week so, seven days i'm just gonna write how many, per week then, one week you didn't have to do this if, you didn't do that step that's probably, okay, and then um we've got, one pill equals 1.5, times 10 to the fifth micrograms but i, have milligrams and micrograms here so i, need a relationship between milligrams, and micrograms, okay so i know there's a thousand, milligrams in one gram and there's 10 to, the sixth, micrograms in one gram so i'm going to, combine those and say there's a thousand, microgram sorry milli, milligrams equals 10 to the six, micrograms and i'm going to use this, relationship, all right so i want don't know how many, pills i'm going to start with this, relationship because that's got pills in, it, start there so for every one pill, it's 1.5 times 10 to the 5, micrograms i know we're at 9 15. give me, until 9 16., okay we're almost done and then, i want to cancel micrograms so now i'm, going to use this second relationship, down here and plug that in, i'm going to put micrograms on top, and a thousand milligrams on bottom so, that micrograms cancel, um i know that i need to cancel, milligrams now, we got 300 milligrams a day so i'm going, to pick this relationship next, 300 milligrams on top for one day, on bottom and then we got to go for, seven days we're gonna do times seven, days, for every one week, and milligrams cancel and days cancel as, well, again if you just multiplied by the, seven you didn't write the per week part, that's okay, now when you start this problem you, cannot ignore this one, it's one over 1.5 times 10 to the 5., all right did anybody get an answer here, how many pills, let's calculate it real quick because i, got to let you guys go if you got to go, i know we're past time thank you for, joining us i'm going to calculate this, answer and then if anybody has questions, bradley said he got 14. can anybody, confirm or deny, you got to go thanks for joining us i, got an office hour at 9 00, 9 30. bailey said that's what i got, jacob said that's what i agree okay, i'm going to save 14 pills

Reddit Images 28

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how do I write the balanced net ionic equation for question 2, and what's the answer? I thought I knew, but my answer key is saying the answer is: 3Cu2+ + 2Al -> 2Al3+ + 3Cu 3

Writing formulas for ionic compounds. Why do I start off with 2+ and 2-, but end with 1+ and 1- in final answer? 4

A report in Science shows that adding an ionic molecule into a semiconductor compound with a structure discovered nearly 200 years ago could be the key to advance future low-cost solar technology. 5

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[College: Organic Chemistry 1: NMR Spectroscopy]: How many doublets does this compound form? From my understanding, it has 7 hydrogens therefore 7 doublets, but the answer key says 4 without much explanation. Just wondering what I'm missing and where those 4 hydrogens are and why the other 3 are not 8

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Why is the ionic formula for barium chlorite BaClO2? Shouldn’t it be Ba(ClO2)2 because Ba has a +2 charge and ClO only has a - charge? This is my professors answer key so he might have done something wrong 15

A report in Science shows that adding an ionic molecule into a semiconductor compound with a structure discovered nearly 200 years ago could be the key to advance future low-cost solar technology. 16

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