Chemical Equilibria

Question 1

What is a reversible reaction?

Answer 1

This is one of that proceeds in both the forward and reverse directions depending on the reaction conditions.

Question 2

What factors affect the position of equilibrium?

Answer 2

Temperature
Pressure
Concentration of reactants and products

Question 3

True or false
During a reversible reaction, concentration of the reactants decreases while that of the products increases with time.

Answer 3

True

Question 4

True or false
As the concentration of reactants reduces the rate of the forward reaction reduces well while the rate of the reverse reaction increases.

Answer 4

True

Question 5

What is a homologous reaction?

Answer 5

This is a reaction in which all the reactants and products are in the same physical state of matter

Question 6

How is the value of Kc of an endothermic reaction affected by increasing temperature?

Answer 6

The value of Kc increases.

Since the forward reaction is endothermic, increase in temperature would shift equilibrium from the left to the right forming more products and less reactants.

Question 7

How is the value of Kc of an exothermic reaction affected by increasing temperature?

Answer 7

The value of Kc decreases.

Since the forward reaction is exothermic, increase in temperature would shift equilibrium from the right to the left forming less products and more reactants. (Favours the reverse reaction)

Question 8

How is the value of Kc of a reaction affected by increasing the volume?

Answer 8

The value of Kc remains constant

Change in volume has no effect on the Kc value at constant temperature

Question 9

What is a heterogeneous reaction?

Answer 9

This is a reaction in which the different substances involved in the reaction are not in the same physical state of matter

Question 10

True or false
Equilibrium constant in terms of Kp of a heterogeneous reaction only applies to liquids and gases

Answer 10

False
Only gases because solids and liquids cannot be compressed