(LEGO) Block Party: Crash Course Kids #23.2 - By Crash Course Kids
Transcript
| 00:12 | Oh hi there . Yeah , you caught me . | |
| 00:14 | There's nothing that says big kids can't play with legos | |
| 00:17 | too . But you know these legos are business related | |
| 00:19 | being the sci fi type . I can use them | |
| 00:21 | to learn about things like mass . Like if I | |
| 00:24 | measure the mass of all these legos separately and then | |
| 00:26 | compared them to the mass of the building or the | |
| 00:28 | dinosaur or whatever I make when I put them together | |
| 00:31 | , then I find that the masses are always the | |
| 00:33 | same . But you already knew that because you remember | |
| 00:35 | all about the conservation of mass . The rule that | |
| 00:37 | says masses never made or lost . We tested that | |
| 00:40 | rule out by making matter , go through physical changes | |
| 00:43 | like mixing it into a solution . But what about | |
| 00:45 | chemical changes ? Like those things that happened during our | |
| 00:47 | cake baking adventure ? Does conservation of mass apply there | |
| 00:53 | ? You know that during chemical changes the particles that | |
| 00:57 | make up two or more substances become rearranged to make | |
| 01:00 | a new substance . And then there are things that | |
| 01:02 | give us clues that a chemical changes occurring like a | |
| 01:04 | change in temperature or lots of bubbling or maybe even | |
| 01:07 | a flash of light . You also know the special | |
| 01:09 | names that scientists give . The substances that take part | |
| 01:12 | in a chemical reaction . The reactant are the substances | |
| 01:15 | that you start out with . That's the stuff that's | |
| 01:17 | made of the particles that get rearranged during the chemical | |
| 01:20 | reaction and the new substance that gets made . That | |
| 01:23 | is the product . And I bet we can show | |
| 01:25 | what happens during a chemical change by using my legos | |
| 01:28 | . See I knew would have an excuse to play | |
| 01:30 | with these . If we pull the cubes apart , | |
| 01:32 | mix up the legos and build something funky shape from | |
| 01:34 | the exact same blocks that made up the cubes . | |
| 01:37 | That's our product . Well , I did say funky | |
| 01:40 | shaped notice that it's made of the same legos as | |
| 01:42 | the original cubes . They've just been rearranged . It | |
| 01:45 | makes sense that the mass of this new product would | |
| 01:47 | have the same mass as the original reactant , right | |
| 01:50 | ? Because they're made out of the exact same stuff | |
| 01:52 | . Ready to test that out . Okay , lets | |
| 01:55 | get experimenting . Three mm . But instead of playing | |
| 02:01 | with legos this time let's mix to liquid reactant substances | |
| 02:05 | that sound terrible together , vinegar and cream . We'll | |
| 02:09 | measure the mass of each liquid and record those in | |
| 02:12 | a table . Oh next we'll stir them in the | |
| 02:24 | same bowl . Gross may be a good example of | |
| 02:27 | the conservation of mass . Definitely the to react . | |
| 02:30 | It's mixed together . Made a new substance that disgusting | |
| 02:34 | goop is kurds , a solid product that can't be | |
| 02:37 | turned back into two liquids . So boom , that's | |
| 02:40 | the chemical change . And the solid product that it | |
| 02:42 | formed has the same mass as the two liquid reactant | |
| 02:45 | , which we will now note in our trusty table | |
| 02:48 | . Now the mass would still be conserved even if | |
| 02:51 | the chemical reaction makes products that aren't solid . Like | |
| 02:55 | if we were to mix a little bit of vinegar | |
| 02:56 | with baking powder , it would make a lot of | |
| 02:58 | bubbly foam , which is caused by a release of | |
| 03:01 | gas and gas . If you remember way back to | |
| 03:04 | our balancing balloons , experiment is matter and has mass | |
| 03:08 | no matter what state the products are in . If | |
| 03:10 | you add up the mass of all of the products | |
| 03:12 | , it will always equal the mass of all of | |
| 03:13 | the reactant . It's so so the mass is always | |
| 03:20 | conserved or saved . It never goes away . And | |
| 03:23 | as we saw in our vinegar and cream experiment , | |
| 03:26 | chemical changes like physical changes follow the conservation of mass | |
| 03:30 | . That scientific rule that says matter can be made | |
| 03:33 | and can't just disappear . Okay ? Now that the | |
| 03:35 | business part is over , I'm a building a velociraptor | |
| 03:39 | . It'll be fine |
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