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AP Chemistry 1.2 Chemical Reaction Rates 8 Views


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Description:

AP Chemistry 1.2 Chemical Reaction Rates. Approximate the appearance rate of ozone.

Language:
English Language

Transcript

00:04

And here’s your Shmoop du jour, brought to you by oxygen. [Man on a sofa surrounded by oxygen]

00:07

We love it so much we’d die without it.

00:10

…Literally.

00:11

Okay, here’s our question: The disappearance rate of oxygen in the reaction

00:16

3 O2?

00:17

yields 2 O 3 is equal to 0.40 moles per liter per second.

00:24

Approximate the appearance rate of ozone.

00:26

And here are your potential answers…

00:28

All right, so we know the rate at which O2 is disappearing. [Magician makes O2 disappear]

00:34

All we need to do is use the stoichiometry of the reaction equation

00:39

to find the rate of O3 appearance.

00:42

Easy peasy lemon squeezy? [Lemon squeezed on equation]

00:43

Alright, well it's not as scary as it sounds…

00:46

Using the reaction equation, for every 3 oxygen molecules that disappear, 2 ozone molecules

00:52

appear.

00:53

O2 is disappearing at a rate of 0.40 moles per liter per second.

00:57

No, not that kind of mole – the Avogadro’s number kind. [Mole in the ground and Avogadro's constant lands on its head]

01:00

Yeah, it’s confusing.

01:01

Just don't try shoving a mole into a beaker and you should be okay. [Student holding a mole in a beaker]

01:05

Anyway, we can set up a proportion using the stoichiometry and reaction rates to find x,

01:10

which represents the unknown rate of O3 appearance.

01:13

Which is what the question is asking for, in case you got lost over there in the labyrinth [A couple lost in a maze]

01:17

of chemistry and angry moles…

01:20

If we multiply both sides of this equation by 0.4 moles per liter per second and crunch

01:25

the numbers…

01:26

Mm, mm…

01:27

Mathy…

01:28

… We find out that the rate of appearance of ozone is 0.27 moles per liter per second.

01:35

So B is the correct answer.

01:37

Now go take a deep breath and thank a tree for that sweet, sweet O2 . [Girl takes deep breath and hugs a tree]

01:39

Seriously, write it a thank you card.

01:42

No one ever appreciates all the hard work its doing…[Thank you card by a tree]

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