you're ready to study along with Melissa Louisiana because she wants an A and I hope you won today too now before we even start make sure you already downloaded your free study plan you can find a link in the description box to download that all right so since chapter one started off with matter and I know that these tend to be a little bit like simpler I'm just because we it's more like definitions but I would say this is probably the trickier multiple choice question because there's so much to choose from and they all kind of seem like the same thing so let's just make sure we cover this you understand matter you understand how to classify it and then we'll go from there I have some examples so just classifying matter we know everything is made up of something right or it matter and there's two different types you're gonna see pure substances or actually start off with what a pure substance is that's going to be composed of only one type of atom or molecule think of it it's it's basically just composed of one certain thing okay and then next you are going to see a mixture of things so two different things complete that are mixed together so composed of two or more different types of atoms and molecules it's going to make so much more sense since once we actually put examples to this so I'll start off with the just the different types of pure substances so an element a pure element is something going to be like iron or let's say silver in this case AG anything that's just by itself think of an element as I can't break it down any more it's already in the simplest form while a compound though it's composed of multiple things like two or more elements but I also want you to think of it this way it's a pure substance because it's made up of elements right so it's not made up of like an element and something about you different right so it's it's two elements composed compose a compound and that could either be did you guys go over ionic and covalent compounds we did not know okay let me go over that but Malnik compound just means that it's composed of one metal and one nonmetal so like in this case NaCl or salt is just going to be a metal so our metal is going to be sodium and that's positively charged and then our nonmetal is going to be chlorine and that's negatively charged so I'd say don't worry too much about the charges right now you guys are going to cover this I think next chapter but just knowing that there are different types of compounds some that are called ionic compounds and then others that are called covalent compounds and those consists of only nonmetals so it's I'm gonna say it's two or more nonmetals and that's something like carbon dioxide co2 next we're gonna see different types of mixtures so our first type is going to be homogenious where everything is basically the same it's uniform so you're only going to be able to see the same exact layer you're not going to see two different types of layers or or two different distinct things so in this case I want you to think of just coffee we're all coffee lovers here so just black coffee is going to be a homogeneous mixture since we're mixing water and those coffee grounds first is something that's heterogeneous where it's not going to be uniform and we're gonna see two distinct layers or multiple layers like let's say I don't know what this concoction is but whatever this is you're actually going to see two different layers so just as a practice run go ahead and tell me what you think each one of these are label them either pure substance or like we're just going to talk it out but tell me if it's a pure substance or mixture and specifically what type of pure substance and what type of mixture try these questions out on your own and don't worry we'll go over the answers together so iron would be a pure substance right it would be an element correct good great um wet sand would be a mixture and it would be would it be heterogeneous yes it would is that and there it sits since it told you that it is wets amped that like description is going to help you so much and you're actually going to see that a lot with these types of questions when they give you some sort of adjective you know or just or something that's actually describing the sand or describing something but kind of your hint of whether or not it's homogeneous or heterogeneous so it was just regular sand I'm going to be homogeneous it could have been yes okay okay carbon monoxide would be a um it's not a compound it's yeah and that's a type of pure substance or mixture Oh pure substance perfect and then orange juice orange juice I think would be weight would this depend on if has pulp in it it does no it does but because they didn't specify they didn't say there was pulp just think it's just pure and there's no pulp just think of it as it's just orange juice okay so then it's gonna be a homogeneous mixture perfect tea with sugar um I feel like they're trying to trick me um I feel like the sugar would dissolve in the tea so therefore it would be um a genius mixture perfect yes what about air I have no idea um can you see air like like kitten know like it's like to our understanding is it uniform like can you seat multiple layers in it in arrows yeah so it's uniform okay so then it would be homogeneous yes and then it is a mixture just uh this is actually a really good question I see this all the time with air it is a mixture of different gases but but we don't see it now if they would have would had said there's small get in the air now it there's two different things there so that would have been heterogeneous okay then this one's kind of tricky what about blood mm-hmm so if we look at it then it looks homogenious but I feel like it's heterogeneous because um based on what I learned like last semester the blood like separates and the layers like the different cells right so because there's plasma and there's the actual like blood cells right exactly yeah so that that's this is a little bit tricky just because yeah it to us it looks uniform like we don't really think about you don't really think about what blood looks like you know we all just kind of see it looks uniform but thinking about what's in it yes if we go in a more specific level like actually looking at what's inside so good these are these are definitely great sort of questions once again if they ever add some sort of descriptive factor where like like we said like with air and it having smog or let's say coffee with creamer you know now that now we changed it so those little distinctions can actually change the mixture from homogeneous to heterogeneous does this make sense yes except the only thing I see okay so if you have coffee and you have tea how come you add the cream to the coffee it changes it but you add sugar to the tea and it doesn't change that so it just depends on sorry that was probably not the best example but think of it like with foam like a like a cappuccino sort of thing you know if you could yet a liar yes okay but like iced coffee or actually even that hot coffee that's mixed in with this is like really specific but mixed in with actually creamer and it's the same uniform yeah that that's going to be homogeneous however if it were I'm really being specific now like if it were like a cappuccino like you got to know your coffees here yeah but you know would be heterogeneous okay got it walk into the Starbucks and order a bunch of things and just point it out yeah we need to do okay so then this one they can actually give you different pictures and that's all they give you and they're they're gonna ask you the same exact question so let's start off with the first woman to the left what do you think that one would be pure substance or mixture and what specific type try this question out on your own okay the first one is pure substance and it's an element perfect and then the one right next to it to the right that's going to be a mixture it's gonna be heterogeneous comes layers perfect keep going dad I'm so excited because I like proud of myself okay um and then the one underneath the pure substance okay that one is hetero wait homogenius because it's two different things but they're uniformly like mixed beautiful and that last one that's a compound perfect okay okay I hope you're learning a lot already and if you need more help than make sure to visit my website Melissa Maribel comm and I'll see you in the next video [Music]