The Great Picnic Mix Up: Crash Course Kids #19.1 - By Crash Course Kids
Transcript
| 00:09 | summertime is picnic time with sweet iced tea and yummy | |
| 00:12 | fruit salad and ants , but still yummy fruit salad | |
| 00:16 | . And Hey , did you notice something ? Those | |
| 00:18 | foods have something in common ? They're both mixtures things | |
| 00:21 | made by combining two or more different things . Not | |
| 00:23 | the ants , they're just ants . But the iced | |
| 00:25 | tea and the fruit salad are mixtures . Anytime you | |
| 00:27 | combine two different things , you make a mixture , | |
| 00:30 | whether it's strawberries and bananas , raspberries and blackberries or | |
| 00:33 | cantaloupe and legos , which I don't recommend eating at | |
| 00:36 | all . I'm just saying it's a mixture . So | |
| 00:38 | let's have a little science whether picnic shall we , | |
| 00:40 | let's talk about the different kinds of mixtures we can | |
| 00:42 | discover . For example , if we make sand and | |
| 00:49 | water in a glass , we'll get a mixture even | |
| 00:51 | though after a while the stand will settle to the | |
| 00:53 | bottom of the glass . But if we stir some | |
| 00:54 | sugar into the water , the sugar looks like it | |
| 00:56 | disappears , but it really doesn't . The particles that | |
| 00:59 | make up sugar become distributed or spread around evenly among | |
| 01:02 | the particles that make up water . We call this | |
| 01:04 | kind of mixture of solution solutions have two main parts | |
| 01:07 | The salute , which is the stuff that dissolves in | |
| 01:09 | this case the sugar and the solvent , which is | |
| 01:12 | the stuff in which the salyut dissolves in this case | |
| 01:14 | the water . Now , solutions can be made from | |
| 01:16 | types of matter that are in different states . To | |
| 01:18 | for example , the air that we breathe is made | |
| 01:20 | up of a solution of gas is mostly nitrogen , | |
| 01:22 | oxygen and carbon dioxide and soda water is really a | |
| 01:25 | solution of carbon dioxide , gas and liquid water . | |
| 01:28 | But no matter what and this is important , mixing | |
| 01:31 | things together in solutions does not make a whole new | |
| 01:33 | substance . Solutions can be separated again back into the | |
| 01:36 | substances that made them . So for example , if | |
| 01:38 | you leave the lid off a bottle of soda water | |
| 01:40 | , the carbon dioxide that's dissolved in the water will | |
| 01:42 | slowly float up to the top and bubble away . | |
| 01:44 | Given enough time , you'll be back to having plain | |
| 01:46 | old water in the bottle , in carbon dioxide in | |
| 01:48 | the air as two separate things not mixed together . | |
| 01:51 | So when you take a sip of your favorite fizzy | |
| 01:52 | drink , you're drinking a solution , but not all | |
| 01:55 | substances dissolve easily into other substances . The ability of | |
| 01:58 | something to be dissolved is called its value bility . | |
| 02:01 | Sand doesn't dissolve in water , for instance . So | |
| 02:03 | we say it has low soluble itty and water , | |
| 02:05 | but sugar dissolves pretty easily . So sugar has high | |
| 02:08 | soluble itty and water . Still , no matter how | |
| 02:10 | easily something might dissolve into another thing , you'll eventually | |
| 02:13 | reach the point where it can't dissolve anymore . Let's | |
| 02:15 | say you pour a whole bunch of sugar into a | |
| 02:17 | small glass of water if you keep adding sugar to | |
| 02:19 | it to make it even sweeter . And who would | |
| 02:21 | blame you for trying ? You'll get to a point | |
| 02:23 | where no more sugar can dissolve . The actual will | |
| 02:25 | just sit at the bottom . This is called saturation | |
| 02:28 | . The point at which no more salute can dissolve | |
| 02:29 | into a solution . Saturation happens when there's just no | |
| 02:32 | more room for the particles that make up the salute | |
| 02:34 | . In this case the sugar to squeeze between the | |
| 02:36 | particles of the solvent , the water . All of | |
| 02:39 | this is making me snacking . Let's check out our | |
| 02:45 | picnic table again and investigate the different kinds of mixtures | |
| 02:47 | we see there . Let's start with the fruit salad | |
| 02:50 | . That's definitely a mixture of different kinds of fruit | |
| 02:52 | is the solution , nope , because the particles that | |
| 02:54 | make it up aren't equally distributed . I can dip | |
| 02:56 | my spoon in there and come up with nothing but | |
| 02:58 | strawberries one time and then go back for more and | |
| 03:00 | get a spoonful of only bananas . How about the | |
| 03:02 | sweet tea ? The solution to that question is that | |
| 03:05 | it's a solution particles of say water and sugar in | |
| 03:07 | the tea are evenly distributed in the glass every bit | |
| 03:10 | contains water and sugar , they're spread out evenly . | |
| 03:13 | Now can the substances that make up our iced tea | |
| 03:15 | solution be taken apart again , yep . If we | |
| 03:17 | heat the T . So that the water and the | |
| 03:19 | solution changes from a liquid to a gas , it | |
| 03:21 | evaporates into the air , leaving the sugar behind . | |
| 03:27 | So let's go over what we learned that our little | |
| 03:29 | mixed up picnic . A mixture is made by combining | |
| 03:32 | two or more substances . When the particles that make | |
| 03:34 | up the substances are equally distributed . The mixture is | |
| 03:37 | called the solution solutions can be made of substances that | |
| 03:39 | are in the same state of matter , like gases | |
| 03:41 | in the air or in different states of matter , | |
| 03:43 | like the gas bubbles in soda , the salute is | |
| 03:45 | the part of the solution that is dissolved in the | |
| 03:47 | solvent is the part into which the salyut dissolves and | |
| 03:50 | solutions . And some other kinds of mixtures don't always | |
| 03:52 | make new substances , even though it might look that | |
| 03:55 | way . Now let's enjoy what's left of our picnic | |
| 03:57 | before the ants carry it all away . |
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