AP Chem Unit 5: Kinetics

What is required for two molecules to react once they collide?

• correct orientation

• adequate activation energy (speed)

What are the four factors to effect reaction rate?

• concentration/pressure

• temperature

• surface area

• catalyst

What is the standard form of a rate law?

Rate =K[A]^x[B]^y

if Z is the factor by which your concentration changes and Y is the factor by which your rate changes, what formula could be used to find the order?

Z^n=Y

If the initial concentration is doubled, what change in the initial rate would reflect zero order?

zero order = no change in rate

If the initial concentration is doubled, what change in the initial rate would reflect first order?

first order = doubled

If the initial concentration is doubled, what change in the initial rate would reflect second order?

second order = quadrupled

If the initial concentration is doubled, what change in the initial rate would reflect third order?

third order = octupled

As the concentration of products increases, the value of K does what?

Increases, [products]/[reactants]

As the concentration of reactants increases, the value of K does what?

Decreases, [products]/[reactants]

What is the integrated rate law for a zero order reaction?

[A] vs time

What is the integrated rate law for a first order reaction?

ln[A] vs time

What is the integrated rate law for a second order reaction?

1/[A] vs time

How do catalysts increase the rate of a reaction?

By providing an alternative mechanism with a lower activation energy