
(a)
Interpretation:
The effect on the equilibrium position when more concentration of
Concept introduction:
Equilibrium is the state in which there is no variation in the concentration of reactants and products with time.

Answer to Problem 55A
When more concentration of reactants is added to the reaction then number of collision increases between the particles. Thus the
Explanation of Solution
When more concentration of
(b)
Interpretation:
The effect on the equilibrium position when the system is cooled needs to be explained.
Concept introduction:
Equilibrium is the state in which there is no variation in the concentration of reactants and products with time.
(b)

Answer to Problem 55A
When system is cooled or the temperature is decreased, then the equilibrium is shifts towards the right side or product side and vice versa.
Explanation of Solution
The system is cooled down in an exothermic reaction by decreasing in temperature.
If temperature decreases, then equilibrium shifts towards the right side because the forward reaction releases the heat and relieves the stress.
(c)
Interpretation:
The effect on the equilibrium position when a catalyst is added needs to be explained.
Concept introduction:
Equilibrium is the state in which there is no variation in the concentration of reactants and products with time.
(c)

Answer to Problem 55A
A catalyst increases the rate of forward as well as backward reaction to the equal extent. So, the equilibrium is not altered.
Explanation of Solution
A catalyst increases the rate of forward as well as backward reaction to the equal extent. So, the equilibrium is not altered. However, the equilibrium may be attained earlier in the presence of a catalyst.
(d)
Interpretation:
The effect on the equilibrium position by removing the product needs to be explained.
Concept introduction:
Equilibrium is the state in which there is no variation in the concentration of reactants and products with time.
(d)

Answer to Problem 55A
The equilibrium will respond to a decrease in the concentration of a product. The equilibrium shifts in the direction that will tend to bring the concentration of product back up, according to Le Chatelier’s principle.
Explanation of Solution
In any equilibrium, the removal of a product results in a shift to the right and the production of more products. The Le Chatelier’s principle predicts the equilibrium will respond to a decrease in the concentration of a product. The equilibrium shifts in the direction that will tend to bring the concentration of product back up
(e)
Interpretation:
The effect on the equilibrium position by decreasing the volume needs to be explained.
Concept introduction:
Equilibrium is the state in which there is no variation in the concentration of reactants and products with time.
(e)

Answer to Problem 55A
When there is a decrease in volume, the equilibrium will shifts towards the side of the reaction with fewer moles.
Explanation of Solution
When there is a decrease in volume, the equilibrium will shifts towards the side of the reaction with fewer moles. There are few moles of reactants and so the equilibrium will favor the reactants and shift to the left.
Chapter 17 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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