Question

Which of the following statements is(are) true? Correct the false statement(s).

a. When a reactant is added to a system at equilibrium at a given temperature, the reaction will shift right to reestablish equilibrium.

b. When a product is added to a system at equilibrium at a given temperature, the value of K for the reaction will increase when equilibrium is reestablished.

c. When temperature is increased for a reaction at equilibrium, the value of K for the reaction will increase.

d. Addition of a catalyst (a substance that increases the speed of the reaction) has no effect on the equilibrium position.

Short answer

a. False.

b. False

c. False

d. True

Step-by-step solution

Explanation for a

The reaction has no effect when a reactant is added to a system at equilibrium at a given temperature because the addition of more pure liquids or solids (reactants) does not affect the equilibrium. Hence, it is a false statement.

Explanation for b

The value of K for the equilibrium reaction is independent of the products/reactants but dependent on the reaction temperature only. Therefore, it is a false statement.

Explanation for c

For the endothermic reaction, the value of K will decrease with increasing temperature, whereas the value of K for the endothermic reaction will increase. Hence, this statement is false for exothermic reactions.

Explanation for d

The addition of a catalyst has no influence on the equilibrium position; it just causes the process to achieve equilibrium faster. Hence, It is a true statement.