MIT's Choose-Your-Own: Chemistry Adventure - By MITK12Videos
Transcript
| 00:0-1 | So this is hydrogen peroxide . You might recognize it | |
| 00:02 | from your first aid kit because it's really good at | |
| 00:04 | killing germs , but there's more to this guy than | |
| 00:07 | cleaning cuts . So this liquid is actually made up | |
| 00:10 | of molecules that are constantly wanting to break apart hydrogen | |
| 00:14 | peroxide or H202 is held together by an unstable bond | |
| 00:18 | , this one between the oxygen atoms . So the | |
| 00:21 | molecule wants to break down into smaller , more stable | |
| 00:24 | pieces H 20 or water , and 02 or oxygen | |
| 00:28 | gas . Now this breakdown is usually so slow we | |
| 00:31 | can't even see it happening . But what if we | |
| 00:33 | did want to see it happen ? We can speed | |
| 00:36 | up this reaction a lot by using yeast used to | |
| 00:40 | make something called cattle A's . And what this does | |
| 00:42 | is speed up the breakdown of hydrogen peroxide . And | |
| 00:45 | something that speeds up a chemical reaction is called a | |
| 00:47 | catalyst . And the reason use to make cattle A's | |
| 00:49 | is because hydrogen peroxide damages cells and DNA . So | |
| 00:52 | the Catalans goes around and breaks apart hydrogen peroxide so | |
| 00:56 | it can't damage the yeast . And actually our bodies | |
| 00:58 | have cattle lease to protect ourselves in DNA . And | |
| 01:02 | the cool thing is the catalyst doesn't get used up | |
| 01:04 | at all in the process . So it keeps going | |
| 01:06 | around , breaking apart the hydrogen peroxide quickly releasing oxygen | |
| 01:10 | gas and water . And normally this oxygen gas would | |
| 01:13 | just get released out into the air . But for | |
| 01:15 | fun we can trap it in soap bubbles . This | |
| 01:18 | is the hydrogen peroxide you can buy at the drugstore | |
| 01:20 | , it's not very strong , it's only 3% , | |
| 01:23 | but this one is 30% . I'm deluding this down | |
| 01:27 | with water to 12% , mixing one millim of dish | |
| 01:30 | soap and some food coloring . I'm also taking a | |
| 01:34 | gram of yeast and activating it with four million liters | |
| 01:37 | of warm water . Mm So what do you think | |
| 01:40 | will happen if we mix all these together ? Uh | |
| 01:46 | huh . Mhm . So pretty cool . But can | |
| 01:53 | we get even more foam ? Can we make it | |
| 01:55 | faster ? Let's tweak each of the ingredients one at | |
| 01:59 | a time and figure out how they affect the reaction | |
| 02:01 | . Should we change the amount of hydrogen peroxide , | |
| 02:03 | the amount of soap or the amount of yeast ? | |
| 02:06 | Mhm . Mhm . |
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