AP Chem Kinetics Test

Consider the following rate law: Rate = k[A]ⁿ[B]^m
How are the exponents n and m determined?

• by using balanced chemical equation
• By using the subscripts for the formulas
• By educated guess
• By experiment 

step 1: O₃ → O₂ + O
step 2: O₃ + O → 2 O₂

The oxygen atom (O) is considered to be a(n)...

• reactant
• catalyst
• reaction intermediate
• activated complex

Tags

NGSS.HS-PS1-7

• IO^-, because it was used as a reactant in an earlier step and reproduced in a subsequent step
• I^-, because it was used as a reactant in an earlier step and reproduced in a subsequent step
• IO^-, because it was produced in an earlier step and used up in a subsequent step
• I^-, because it was produced in an earlier step and used up in a subsequent step

A catalyst:

• should be eliminated when we solve elementary reaction steps of a proposed reaction mechanism simultaneously
• should always be introduced and eliminated in the first elementary step of a proposed reaction mechanism
• lowers the amount of energy released by an exothermic reaction
• lowers the amount of activiation energy

Multi-step (Consecutive) Reactions:
Mechanisms in which one elementary step is followed by another are very common.
step 1:              A + B → Q
step 2:              B + Q → C
net reaction:    A + 2B → C
Which of the following is false?

• The net reaction is just the sum of its elementary steps.
• The species Q is an intermediate, usually an unstable or highly reactive species. 
• Intermediates such as Q can appear in the rate law of a net reaction.
• If both steps proceed at similar rates, rate law experiments on the net reaction would not reveal that two separate steps are involved here.The rate law for the reaction would berate=k[A][B]2

The rate law for a reaction is rate = k [A][B]2 Which one of the following statements is false? 

• A) If [B] is doubled, the reaction rate will increase by a factor of 4. 
• B) The reaction is second order in B.
• C) The reaction is first order in A.
• D) The reaction is second order overall.

Tags

NGSS.HS-PS1-5

The graph shown depicts the relationship between concentration and time. What is the slope of this line?

• -k

• -1/k

• k

• ln[A]o

Tags

NGSS.HS-PS1-5

What is the rate law for this reaction?

• rate = k[X]0

• rate = k[X]

• rate = k[X]²

• rate = -k[X]²

Tags

NGSS.HS-PS1-5

What is the rate of reaction?

• How fast a reaction is

• How big a reaction is

• How loud a reaction is

• How much gas is produced

Tags

NGSS.HS-PS1-5

A catalyst works by

• changing the order of the reaction
• increasing the temperature
• lowering the activation energy
• making the activated complex