Quiz | Chemical Kinetics: Mechanisms

1

How do we call the minimum amount of energy needed to start a reaction?

The energy of reaction

The Arrhenius energy

The activation energy

The catalyst energy

2

What is the relationship between the rate constant k and the temperature as predicted by the Arrhenius equation?

A plot of ln k in function of T is linear

A plot of k in function of T is linear

A plot of k in function of 1/T is linear

A plot of ln k in function of 1/T is linear

3

The activation energy in the forward direction of an elementary step is 40 kJ. The activation energy in the reverse direction is 55 kJ. What is ΔHrxn for this step?

- 15 kJ

+ 15 kJ

+ 40 kJ

+ 95 kJ

4

Suppose the reaction: 2 NO2 + F2 → 2 NO2F occurs by the following mechanism:
(1) NO2 + F2 → NO2F + F (slow)
(2) NO2 + F → NO2F (fast)
What is the rate law of this reaction?

k [NO2][F]

k [NO2][F2]

k [NO2]2[F2]

k [NO2]2[F2][F]

5

Suppose the reaction: 2 NOCl 2 NO + Cl2 occurs by the following mechanism:
(1) NOCl NO + Cl (fast, equilibrium)
(2) NOCl + Cl → NO + Cl2 (slow)
What is the rate law of this reaction?

k1 [NOCl][Cl]

k2 [NO][Cl]2

k[NOCl]2/[NO]

All of the above

6

Which of the following statements concerning a catalyst is incorrect?

It decreases ΔHrxn for the reaction

It provides a new path for the reaction

It lowers the activation energy

It is not consumed in the reaction

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