Answer:

exp inital [A]

(mol L−1)

inital [B]

(mol L−1)

initial rate of formation of [C]

(mol L−1 sec−1)

1 0.10 0.10 2.5 × 10-4

2 0.20 0.10 5.0 × 10-4

3 0.20 0.50 1.25 × 10-2

1. The initial-rate data in the table above were obtained for

the reaction represented below. What is the experimental

rate law for the reaction.

A + B ⇄ 2 C

a. rate = k[A][B]

b. rate = k[A][B]

2

c. rate = k[A][B]

3

d. rate = k[A]

2

[B]

2

e. rate = k [A]

[B]

2. rate = k[A]2

For the reaction for which rate law is given above, a plot

of which of the following is a straight line?

a.

1

[A]

versus time

b. [A] versus 1

time

c. [A] versus time

d. ln [A] versus time

e. ln [A] versus 1

time

3. 2 X(g) + Y(g) ⇄ 2 Z(g)

When the concentration of substance Y in the reaction

above is doubled, all other factors being held constant, it

is found that the rate of the reaction quadruples. The most

probable explanation for this observation is that

a. substance X is not involved in any of the steps of the

mechanism.

b. substance Y is involved in the rate-determining step

of the mechanism but is not involved in subsequent

steps.

c. substance Y is probably a catalyst and thus speeds up

the rate of the reaction.

d. the reactant with the smallest coefficient in the

balanced equation generally has the greatest effect on

the rate of the reaction.

e. the order of the reaction with respect to Y is 2.

4. The proposed steps for a catalyzed reaction between X4+

and Z+ are represented below.

step 1: X4+ + Y2+ → X3+ + Y3+

step 2: X4+ + Y3+ → X3+ + Y4+

step 3: Y4+ + Z+ → Z3+ + Y2+

The catalyst in this process is

a. X4+

b. X3+

c. Y4+

d. Y2+

e. Z+

5. The balanced equation for the reaction of nitrogen dioxide

and fluorine is

2 NO2 + F2 → 2 NO2F

The proposed mechanism is

step 1: NO2 + F2 → NO2F + F (slow)

step 2: F + NO2 → NO2F (fast)

Which of the following are correct?

I. The mechanism supports an experimentally

determined rate law of rate = k[NO2]2[F2]

II. F is an intermediate

III. The reaction is first order in F2

a. I only

b. I and II only

c. I and III only

d. II and III only

e. I, II, and III

6. Each of the following is true about heterogenous catalyst

EXCEPT

a. Its presence changes the rate of chemical change.

b. It does not undergo a permanent change.

c. It is in the same phase as the reacting particles.

d. It’s presence lowers the activation energy of the

overall reaction.

e. Its presence decreases the potential energy of the

activated complex.

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