   Chapter 20, Problem 102CP

Chapter
Section
Textbook Problem

# A proposed two-step mechanism for the destruction of ozone in the upper atmosphere is a. What is the overall balanced equation for the ozone destruction reaction?b. Which species is a catalyst?c. Which species is an intermediate?d. What is the rate law derived from this mechanism if the first step in the mechanism is slow and the second step is fast?e. One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the reaction CCI 2 F 2 Freon-12 → h v CF 2 Cl  +  Cl Chlorine atoms also can act as a catalyst for the destruction of ozone. The first step of a proposed mechanism for chlorine-catalyzed ozone destruction is Cl ( g ) + O 3 ( g ) → ClO ( g ) + O 2 ( g )               Slow Assuming a two-step mechanism, propose the second step in the mechanism and give the overall balanced equation.

(a)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere and the first step mechanism for the chlorine catalyzed ozone destruction are given. The answers are to be stated for the given options.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

The intermediates are the transient species that is capable to produce the desired product directly.

To determine: The overall balanced equation for the destruction of ozone.

Explanation

Explanation

The overall balanced equation is,

O3+O2O2

The given representation of destruction of ozone is,

Figure 1

In the above representation,

• Blue color represents nitrogen (N) .
• Red color represents oxygen (O) .

The chemical equations for the destruction of ozone are written using the above representation

(b)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere and the first step mechanism for the chlorine catalyzed ozone destruction are given. The answers are to be stated for the given options.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

The intermediates are the transient species that is capable to produce the desired product directly.

To determine: The catalyst in the mechanism for the destruction of ozone in upper atmosphere.

(c)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere and the first step mechanism for the chlorine catalyzed ozone destruction are given. The answers are to be stated for the given options.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

The intermediates are the transient species that is capable to produce the desired product directly.

To determine: The intermediate in the mechanism of a destruction of ozone in upper atmosphere.

(d)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere and the first step mechanism for the chlorine catalyzed ozone destruction are given. The answers are to be stated for the given options.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

The intermediates are the transient species that is capable to produce the desired product directly.

To determine: The rate law, if first step is slow and second step is fast.

(e)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere and the first step mechanism for the chlorine catalyzed ozone destruction are given. The answers are to be stated for the given options.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

The intermediates are the transient species that is capable to produce the desired product directly.

To determine: The second step in the mechanism for chlorine catalyzed ozone destruction and the overall balanced equation.

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