REACTION RATES MULTIPLE CHOICE QUESTIONS WITH ANSWERS
Note: The letter in bold is the correct answer
Direction: Read the questions carefully and choose the letter of your answer.
1. The rate law for a reaction is k[A][B]
2
Which one of the following statements is false?
a. The reaction is first order in A.
b. The reaction is second order in B.
c. The reaction is second order overall.
d. k is the reaction rate constant
2. As the temperature of a reaction is increased, the rate of the reaction increases because the
__________.
a. reactant molecules collide less frequently
b. reactant molecules collide more frequently and with greater energy per collision
c. activation energy is lowered
d. reactant molecules collide less frequently and with greater energy per collision
3. The rate of a reaction depends on __________.
a. collision frequency c. collision orientation
b. collision energy d. all of the above
4. Of the following, __________ will lower the activation energy for a reaction.
a. increasing the concentrations of reactants
b. raising the temperature of the reaction
c. adding a catalyst for the reaction
d. removing products as the reaction proceeds
5. A reaction was found to be zero order in A. Increasing the concentration of A by a factor of 3 will
cause the reaction rate to __________.
a. remain constant
b. increase by a factor of 27
c. increase by a factor of 9
d. triple
6. The rate law of the overall reaction is k[A][B]
0
. Which of the following will not increase the rate of
the reaction?
a. increasing the concentration of reactant A
b. increasing the concentration of reactant B
c. increasing the temperature of the reaction
d. adding a catalyst for the reaction
7. The minimum amount of energy needed to start a reaction is called the
a. activation energy.
b. energy of reaction.
c. entropy of reaction
d. reaction mechanism energy
8. When a lit match is touched to the wick of a candle, the candle begins to burn.
When the match is removed, the candle continues to burn, the match,
a. behaves as a catalyst
b. supplies the activation energy
c. is part of the rate determining step
d. lowers the activation energy barrier
9. Which step of a reaction is the rate-determining step?
a. the fastest step c. the first step
b. the last step of the reaction mechanism d. the slowest step
10. Consider the following mechanism: Step 1: Cl + O
3
→ ClO + O
2
Step 2: O + ClO → Cl + O
2
The reaction intermediate is
a. Cl c. O
3
b. O
2
d. ClO
11. A catalyst increases the rate of a reaction by
a. increasing the concentration of reactant(s).
b. decreasing the concentration of the reactant(s).
c. increasing the activation energy of the overall reaction.