Grade 9 Chemistry Lesson 2, Mixtures and Pure Substances - By Lumos Learning
Transcript
| 00:01 | Hi there . Welcome to Mr Lee Han teaches you | |
| 00:02 | stuff . This is great . Nine chemistry lesson two | |
| 00:05 | mixtures and pure substances . So first , we'll look | |
| 00:08 | at the difference between a pure substance in a mixture | |
| 00:11 | . Pure substance contains only one type of matter . | |
| 00:15 | It will have a specific set of physical and chemical | |
| 00:18 | properties , whereas a mixture contains at least two pure | |
| 00:22 | substances that do not join together . Chemically , you | |
| 00:25 | can have two things that join together , uh , | |
| 00:29 | and have it still be up your substance . But | |
| 00:31 | they have to be chemically bonded , so there's only | |
| 00:34 | like one type of molecule in the pure substance . | |
| 00:38 | Pure substances can either be elements or compounds . Elements | |
| 00:44 | are particles that cannot be broken down chemically . All | |
| 00:48 | the elements are found on the periodic table of elements | |
| 00:50 | , which looks like this , um , so that's | |
| 00:53 | one type of pure substances , just an element . | |
| 00:56 | And that means that every single piece , every little | |
| 01:00 | particle of that pure substance will be the exact same | |
| 01:03 | element . They'll all be hydrogen , or they'll all | |
| 01:06 | be lithium or whatever it is . So pure . | |
| 01:09 | Substances can also be compounds . Compounds are pure substances | |
| 01:13 | that are made from two or more elements that are | |
| 01:15 | bonded together chemically . So if you have two elements | |
| 01:20 | from the periodic table , such as hydrogen and oxygen | |
| 01:25 | , you can combine those and make a compound . | |
| 01:28 | In this case , that compound is water H . | |
| 01:30 | 20 compounds can be broken apart in chemical reactions , | |
| 01:37 | so there are chemical reactions that can break apart H | |
| 01:39 | 20 or C 02 or whatever it is . Examples | |
| 01:44 | of compounds include sugar , water , carbon dioxide . | |
| 01:48 | Those are all compounds mixtures . There's three different types | |
| 01:53 | of mixtures . There's mechanical mixtures , sometimes also called | |
| 01:58 | heterogeneous mixtures . These are where the ingredients of the | |
| 02:02 | mixture can be easily seen , so an example of | |
| 02:06 | that is pizza . So in the pizza , you | |
| 02:08 | can see the different ingredients . There's cheese . There's | |
| 02:10 | peppers , pepperoni , crust sauce . You can see | |
| 02:14 | all the different bits of it . Another example similar | |
| 02:20 | . One is just different types of cereal mixed together | |
| 02:22 | . You can see that they're shredded cheese and their | |
| 02:24 | stereos . You can see the different bits that make | |
| 02:28 | up the mixture . Another type is suspensions . These | |
| 02:32 | are cloudy mixtures where tiny particles can be seen within | |
| 02:35 | another substance . Suspensions are also considered heterogeneous mixtures because | |
| 02:39 | you can see the different bits of it . Some | |
| 02:42 | example would be some sand and water . Now , | |
| 02:46 | if you let that water sit for long enough , | |
| 02:49 | the sand will settle out and end up on the | |
| 02:52 | bottom . So that's an example of suspension . So | |
| 02:57 | last but not least , we're gonna look at solutions | |
| 03:00 | , solutions or mixtures where two or more ingredients cannot | |
| 03:03 | be told apart . So it looks like the mixture | |
| 03:05 | is just one substance . It can be solid or | |
| 03:09 | a liquid , Um , and these are usually called | |
| 03:11 | homogeneous mixtures as well . So one example of a | |
| 03:15 | solution is if you take some sugar and you pour | |
| 03:18 | it into a glass of water . In this case | |
| 03:22 | , the sugar would be the salute , and the | |
| 03:25 | salute dissolves into the solvent , which is the water | |
| 03:31 | . So once you take a spoon and you stir | |
| 03:33 | it all around , it looks like it's just a | |
| 03:36 | glass of water , so you can't really tell the | |
| 03:38 | two substances apart . Another good example of a mixture | |
| 03:44 | that looks like one substance is brass and brass is | |
| 03:49 | composed of copper and zinc , so you mix the | |
| 03:52 | copper and zinc together when their molten and hot liquid | |
| 03:57 | , and then when they solidify , they are still | |
| 03:59 | a solution . We call them an alloy , but | |
| 04:04 | it's basically metal in solution . The solution of copper | |
| 04:07 | and zinc makes brass . So that's it for this | |
| 04:10 | video tune into the next video , when we look | |
| 04:13 | at physical and chemical properties and changes . |
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