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AP Chemistry 3.3 Chemical Reaction Rates 3 Views


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Description:

AP Chemistry 3.3 Chemical Reaction Rates. Which of the following is true regarding rates of chemical reactions?

Language:
English Language

Transcript

00:04

And here’s your Shmoop du jour, brought to you by decreasing the temperature.

00:07

Turn down for what? …because it’s too hot in here. [Man crushes a table and dances]

00:11

Here’s today’s question:

00:13

Which of the following is true regarding rates of chemical reactions?

00:16

And here are your potential answers:

00:23

This question is about reaction rates, by which we don’t mean how long it takes you [Man on stage telling jokes]

00:28

to start laughing after we tell a hilarious joke.

00:30

We’re talking about chemistry here, guys.

00:33

Get with it.

00:34

There are a few tried and true ways to speed up chemical reaction rates. [Scientist transferring substance to a beaker and it explodes]

00:38

Let’s imagine that each time two of these red molecules react, they create one blue [Red molecules collide and create blue molecule]

00:43

molecule.

00:44

To increase the reaction rate, we could increase the concentration of the reactants.

00:48

This would lead to more collisions between the reacting molecules, which would cause [Molecules colliding]

00:53

the reaction rate to increase.

00:55

That’s pretty straightforward, right?

00:57

Another way we could increase the reaction rate would be to use a catalyst.

01:01

Because that’s the whole point of catalysts.

01:02

Seriously.

01:03

That’s all they do.

01:04

They’re kind of a one-trick pony.

01:07

Catalysts work by decreasing activation energy barriers so molecules that collide are more [Catalysts in a beaker with molecules]

01:13

likely to react.

01:14

And if you’ve ever witnessed two angry people bumping into each other, you’ll know that [Two guys bump into each other]

01:18

people that collide are also pretty likely to react.

01:22

And last, but not least, we could also speed up a reaction by turning up the heat. [Fire burning]

01:28

Besides keeping us nice and toasty, increasing the temperature can speed up a chemical reaction

01:34

by giving reacting molecules more kinetic energy.

01:37

This makes them collide more frequently and with more energy, so they’re more likely [Molecules colliding frequently]

01:41

to overcome the activation barrier and react.

01:44

Which is why if you go to a hot yoga class, you’ll see a lot of people falling over [Boy in yoga class falls over]

01:48

each other.

01:49

That’s how that works, right?

01:50

Hey, that last method sounds really similar to answer B, which says that chemical reaction

01:55

rates can be increased by increasing the temperature.

02:00

And wouldn't you know it, the answer is B. Did you get it right? [Man with hair on fire running and screaming]

02:03

We bet you did.

02:04

You are on fire today. [Man uses fire extinguisher on mans head]

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