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AP Chemistry 1.1 Chemical Reaction Rates 323 Views


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AP® Chemistry: Reaction Rates Drill 1, Problem 1. Which of the following influences the rate of a chemical reaction?

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Transcript

00:03

Here's your shmoop du jour, brought to you by Catalysts.

00:06

Which are generally much more focused than Dogalysts.

00:17

Which of the following influences the rate of a chemical reaction?

00:25

So we're looking for what affects the rate of a chemical reaction. Other than, you know...

00:29

someone cracking a whip and ordering it to hurry the heck up.

00:33

First, let's think about what a chemical reaction is. It's when two or more molecules react

00:39

with each other to form a different molecule.

00:46

Going even more granular, a reaction takes place when collisions take place between the

00:50

reactant particles to form a different arrangement of molecules.

00:56

Let's look at the first answer choice. Concentration of reactants.

01:01

Reactants are just a fancy name for the molecules that are reacting with each other.

01:05

The left side of a chemical equation.

01:08

Thinking logically, if we add more molecules

01:10

to a solution, because there are more molecules and hence more atoms to collide with each

01:15

other, the reaction will typically go faster. Yes, more collisions means faster.

01:21

So the concentration affects the rate. But before we just pick answer choice A, let's

01:28

keep looking. Answer choice B. The temperature. Temperature

01:32

is a measure of the average kinetic energy. Kinetic means movement, so in other words,

01:38

temperature affects the number of collisions that take place.

01:42

Higher temperatures would help speed up a reaction.

01:50

Therefore, Choice (B) is also a true statement.

01:52

We know that C must be true because the only

01:55

choices we have left are C and D...and answer choice D says ALL OF THE ABOVE.

02:00

But let's just take a look at C to be extra sure. The presence of a catalyst.

02:06

Well of course a catalyst will influence the speed, or rate, of a chemical reaction.

02:11

That's the point of a catalyst...to help the reactants form products faster. So again,

02:16

the rate is affected. Our answer's D.

02:19

As in, "Dogalyst..."

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