Kinetics Practice MCQ's

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

• rate = k[A][B]

• rate = k[A][B]²

• rate = k[A]²[B]³

• rate = k[A]²[B]²

• rate = k [A] [B]

Tags

NGSS.HS-PS1-5

For the reaction for which rate law is given below a plot of which of the following is a straight line?

rate=k[A]²

Tags

NGSS.HS-PS1-5

When the concentration of substance Y in the reaction 2 X₍g₎ + Y₍g₎ → 2 Z₍g₎ 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

• substance X is not involved in any of the steps of the mechanism.

• substance Y is involved in the rate-determining step of the mechanism but is not involved in subsequent steps.

• substance Y is probably a catalyst and thus speeds up the rate of the reaction.

• the reactant with the smallest coefficient in the balanced equation generally has the greatest effect on the rate of the reaction.

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

Tags

NGSS.HS-PS1-5

The proposed steps for a catalyzed reaction between X⁺ and Z⁻ are represented in the image. The catalyst in this process is

• X⁺

• X²⁺

• Y⁴⁻

• Y²⁻

• Z⁻

The balanced equation for the reaction of nitrogen dioxide and fluorine is

2 NO₂ + F₂ → 2 NO₂F.

The proposed mechanism is in the image. 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

• I only

• I and II only

• I and III only

• II and III only

• I, II, and III

Tags

NGSS.HS-PS1-5

Each of the following is true about heterogeneous catalyst EXCEPT

• Its presence changes the rate of chemical change.

• It does not undergo a permanent change.

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

• Its presence lowers the activation energy of the overall reaction.

• Its presence decreases the potential energy of the activated complex.

Tags

NGSS.HS-PS1-4

• 1

• 2

• 3

• 5

• 6

Tags

NGSS.HS-PS1-5

According to the rate law for the reaction, an increase in the concentration of hydrogen ion has what effect on this reaction?

• The rate of reaction increases.

• The rate of the reaction decreases.

• The value of the rate law constant increases.

• The value of the rate law constant decreases.

• Neither the rate nor the value of the rate law constant is changed.

Tags

NGSS.HS-PS1-5

According to the rate law for the reaction, a decrease in the concentration of iodide ion has what effect on this reaction?

• The rate of the reaction decreases and the value of the rate law constant decreases.

• The rate of the reaction decreases and the value of the rate law constant remains the same.

• The rate of the reaction remains the same and the value of the rate law constant increases.

• The rate of the reaction decreases and the value of the rate law constant increases.

• Neither the rate nor the value of the rate law constant is changed.

Tags

NGSS.HS-PS1-5

• The total pressure decreases.

• The rate of the reaction decreases.

• The entropy of the system decreases.

• The number of molecules of C decreases.

• The frequency of collisions between molecules A and B decreases.