Question 1

Which of the following best describes the rate of a chemical reaction?

Accepted Answer

The rate of change of concentration of a reactant or product per unit time.

Question 2

For the reaction $$2NO_2 + F_2$ \rightarrow 2NO_2F$$, the rate of reaction can be measured by:

Accepted Answer

The decrease in concentration of $$F_2.$$

Question 3

Which of the following factors does NOT affect the rate constant ($$k) of a $$reaction?

Accepted Answer

Concentration of reactant

Question 4

The rate law for a reaction is given by $$	ext{Rate} = k[A]^2[B]. If $$the concentration of $$A is $$doubled and $$B is $$kept constant, the rate will:

Accepted Answer

Increase by a factor of 4

Question 5

Which of the following statements about molecularity is correct?

Accepted Answer

Molecularity is always a whole number.

Question 6

A reaction is found to be first order with respect to $$A$$ and zero order with respect to $$B. $$The rate law is:

Accepted Answer

$$	ext{Rate} = k[A]$$

Question 7

The half-life of a first-order reaction is given by:

Accepted Answer

$$t_{1/2} = \frac{0.693}{k}$$

Question 8

Which of the following is a feature of a zero-order reaction?

Accepted Answer

The rate is constant and independent of concentration.

Question 9

The Arrhenius equation is used to relate the rate constant $$k to$$:

Accepted Answer

The activation energy and temperature.

Question 10

For a reaction with rate law $$	ext{Rate} = k[A][B]^2$$, what is the overall order of the reaction?

Accepted Answer

3

Question 11

Which of the following best explains why coal dust burns faster than a large piece of coal?

Accepted Answer

Coal dust has a greater surface area, increasing the rate of reaction.

Question 12

A reaction has a rate constant with units $$	ext{mol L}^{-1} 	ext{s}^{-1}. $$What is the order of the reaction?

Accepted Answer

Zero order

Question 13

Which of the following is NOT a correct statement about the order of a reaction?

Accepted Answer

Order of reaction is always a whole number.

Question 14

The activation energy ($$E_a) of a $$reaction can be calculated from the Arrhenius equation using:

Accepted Answer

The rate constants at two different temperatures.

Question 15

Which of the following statements about catalysts is correct?

Accepted Answer

A catalyst provides an alternative pathway with lower activation energy.

Question 16

In a photochemical reaction, the rate depends primarily on:

Accepted Answer

The intensity of light absorbed.

Question 17

For the reaction $$A \rightarrow B$$, the rate becomes 27 times when the concentration of $$A is $$increased 3 times. What is the order of the reaction?

Accepted Answer

3

Question 18

Which of the following is a pseudo first-order reaction?

Accepted Answer

Hydrolysis of ethyl acetate in excess water

Question 19

The minimum energy required for a reaction to occur is called:

Accepted Answer

Activation energy

Question 20

Which of the following is true for a reaction at dynamic equilibrium?

Accepted Answer

The net rate of reaction is zero.

Comprehensive Study Notes on Chemical Kinetics

Guida di studio - Domande di pratica

Study guide - Flashcard