   Chapter 12, Problem 9RQ

Chapter
Section
Textbook Problem

# What is the premise underlying the collision model? How is the rate affected by each of the following?a. activation energyb. temperaturec. frequency of collisionsd. orientation of collisionsSketch a potential energy versus reaction progress plot for an endothermic reaction and for an exothermic reaction. Show ∆E and Ea in both plots. When concentrations and temperatures are equal, would you expect the rate of the forward reaction to be equal to, greater than, or less than the rate of the reverse reaction if the reaction is exothermic? Endothermic?

(a)

Interpretation Introduction

Interpretation: The premise underlying the collision model and the effect on the rate by the given terms is to be stated. The potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction is to be stated. The effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic is to be stated.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations. The minimum amount of energy that is required for a chemical reaction to take place is known as activation energy.

To determine: The premise underlying the collision model and the effect on the rate by the given terms; the potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction and the effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic.

Explanation

To determine: The premise underlying the collision model is to be stated and the effect of ‘activation energy’ on the reaction rate.

According to the collision theory, the molecules should collide with other molecules for a reaction to take place...

(b)

Interpretation Introduction

Interpretation: The premise underlying the collision model and the effect on the rate by the given terms is to be stated. The potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction is to be stated. The effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic is to be stated.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations. The minimum amount of energy that is required for a chemical reaction to take place is known as activation energy.

To determine: The premise underlying the collision model and the effect on the rate by the given terms; the potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction and the effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic.

(c)

Interpretation Introduction

Interpretation: The premise underlying the collision model and the effect on the rate by the given terms is to be stated. The potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction is to be stated. The effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic is to be stated.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations. The minimum amount of energy that is required for a chemical reaction to take place is known as activation energy.

To determine: The premise underlying the collision model and the effect on the rate by the given terms; the potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction and the effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic.

(d)

Interpretation Introduction

Interpretation: The premise underlying the collision model and the effect on the rate by the given terms is to be stated. The potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction is to be stated. The effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic is to be stated.

Concept introduction: The change observed in the concentration of a reactant or a product per unit time is known as the rate of the particular reaction. The differential rate law provides the rate of a reaction at specific reaction concentrations. The minimum amount of energy that is required for a chemical reaction to take place is known as activation energy.

To determine: The premise underlying the collision model and the effect on the rate by the given terms; the potential energy versus reaction progress plot for an endothermic as well as an exothermic reaction and the effect on the rate of the forward reaction if the reaction is exothermic and if the reaction is endothermic.

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