Quiz about Topic 16 HL Chemistry Kinetics

Question 1

Which is correct

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 2

Which graph is obtained from a first order reaction?B

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 3

Which is correct for the reaction mechanism shown?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 4

Which statement is correct about a catalyst?

Accepted Answer

It changes the mechanism of the reaction.

Answer

It decreases the activation energy of the forward reaction but not the reverse.

Answer

It increases the proportion of products to reactants in an equilibrium.

Answer

It decreases the enthalpy change of the reaction.

Question 5

What is the order with respect to each reactant?

Accepted Answer

Order with respect to NO = 2; Order with respect to Cl2 = 1

Answer

Order with respect to NO = 0; Order with respect to Cl2 = 1

Answer

Order with respect to NO = 1; Order with respect to Cl2 = 1

Answer

Order with respect to NO = 2; Order with respect to Cl2 = 2

Question 6

Compounds X and Y were mixed and the time taken for a colour to appear was recorded at various reactant concentrations. What are the orders of reaction with respect to X and Y?

Accepted Answer

X = 1; Y = 2

Answer

X = 1/2; Y = 1/4

Answer

X = 2; Y = 1

Answer

X = 2; Y = 4

Question 7

The reaction between NO₂ and F₂ gives the following rate data at a certain temperature.

Accepted Answer

3

Answer

2

Answer

1

Answer

0

Question 8

When X reacts with Y to give Z, the following graph is plotted. What can be deduced from the graph?

Accepted Answer

The reaction is zero order with respect to X.

Answer

The concentration of X is directly proportional to time.

Answer

The reaction is first order overall.

Answer

The reaction is first order with respect to X.

Question 9

Which statement is correct?

Accepted Answer

The value of the rate constant, k, is temperature dependent and the overall reaction order determines its units.

Answer

The value of the rate constant, k, is independent of temperature and is deduced from the equilibrium constant, K_c.

Answer

The value of the rate constant, k, is independent of temperature and the overall reaction order determines its units.

Answer

The value of the rate constant, k, is temperature dependent and is deduced from the equilibrium constant, K_c.

Question 10

Which pair of statements explains the increase in rate of reaction when the temperature is increased or a catalyst is added?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 11

Which statement describes the characteristics of a transition state relative to the potential energy of the reactants and products?

Accepted Answer

It is an unstable species with higher potential energy.

Answer

It is an unstable species with lower potential energy.

Answer

It is a stable species with lower potential energy.

Answer

It is a stable species with higher potential energy.

Question 12

Which pair of graphs represents the same order of reaction?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 13

Which statement about a first-order reaction is correct?

Accepted Answer

The reactant concentration decreases exponentially with time.

Answer

The reactant concentration decreases linearly with time.

Answer

The rate of reaction remains constant as the reaction proceeds.

Answer

The rate of reaction increases exponentially as the reaction proceeds.

Question 14

Consider the rate expression:

Rate=k[X][Y]

Which change decreases the value of the rate constant, k

?

Accepted Answer

Decrease in the reaction temperature

Answer

Increase in the reaction temperature

Answer

Increase in the concentration of X and Y

Answer

Decrease in the concentration of X and Y

Question 15

Which combination shows a second-order rate expression with the correct rate constant units?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 16

Which graph best represents a second-order reaction?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 17

Experimental data shows that a reaction in which Y is a reactant is first order with respect to Y. Which graph shows this first-order relationship?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 18

Which statement about a reaction best describes the relationship between the temperature, T, and the rate constant, k?

Accepted Answer

As T increases, k increases non-linearly.

Answer

As T increases, k decreases linearly.

Answer

As T increases, k decreases non-linearly.

Answer

As T increases, k increases linearly.

Question 19

Which graph represents a reaction that is first order with respect to reactant A.

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 20

Which step is the rate-determining step of a reaction?

Accepted Answer

The step with the highest activation energy

Answer

The step with the lowest activation energy

Answer

The final step

Answer

The first step

Question 21

The rate expression for a reaction is:

rate=k[X][Y]

Which statement is correct?

Accepted Answer

As the temperature increases the rate constant increases.

Answer

As the temperature increases the rate constant decreases.

Answer

The rate constant increases with increased temperature but eventually reaches a constant value.

Answer

The rate constant is not affected by a change in temperature.

Question 22

What is the intercept on the y-axis when a graph of lnk is plotted against 1T on the x-axis?

Accepted Answer

lnA

Answer

B.

Answer

C.

Answer

Ea

Question 23

What is the effect of increasing temperature on the rate constant, k?

Accepted Answer

The rate constant increases exponentially.

Answer

The rate constant does not change.

Answer

The rate constant decreases linearly.

Answer

The rate constant increases proportionally with temperature.

Question 24

Which is true of an Arrhenius plot of lnk (y-axis) against 1/T?

Accepted Answer

The activation energy can be determined from the gradient.

Answer

The graph goes through the origin.

Answer

The intercept on the x-axis is the activation energy.

Answer

The intercept on the y-axis is the frequency factor, A.

Question 25

Which of the terms in the Arrhenius equation takes into account the orientation of the molecules?`

Accepted Answer

A

Answer

Ea

Answer

R

Answer

T

Question 26

What happens to the rate constant, k, and the activation energy, Ea, as the temperature of a chemical reaction is increased?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 27

The rate constant for a reaction is determined at different temperatures. Which diagram represents the relationship between the rate constant, k , and temperature, T , in K ?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 28

What happens when the temperature of a reaction increases?

Accepted Answer

The rate constant increases.

Answer

The activation energy increases.

Answer

The enthalpy change increases

Question 29

The activation energy of a reaction may be determined by studying the effect of a particular variable on the reaction rate. Which variable must be changed?

Accepted Answer

Temperature

Answer

pH

Answer

Concentration

Answer

Surface area

Create a free account and access millions of resources

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science