Chemical Equilibrium

Question 1

Reversible Reaction

Answer 1

A reaction is reversible when products can be converted back to reactants

Question 2

Exothermic Reaction

Answer 2

A reaction that releases energy

Question 3

Endothermic Reaction

Answer 3

A reaction that absorbs energy

Question 4

Chemical Equilibrium

Answer 4

It is the stage in a reversible chemical reaction when the rate of the forward reaction equals the rate of the reverse reaction

Question 5

Dynamic Chemical Equilibrium

Answer 5

It is the stage in a reversible chemical reaction when the rate of the forward reaction equals the rate of the reverse reaction and both the forward and reverse reactions are occurring continuously and simultaneously

Question 6

Factors that can disturb a chemical equilibrium

Answer 6

1. Change in Concentration
2. Change in Temperature
3. Change in Pressure

Question 7

Le Chatelier’s Principle

Answer 7

When the equilibrium in a closed system is disturbed, the system will re-instate a new equilibrium that will oppose the disturbance

Question 8

Which reaction is favoured for change in :

1. Temperature
2. Pressure

Answer 8

1. Increase in temperature ALWAYS favours the ENDOTHERMIC reaction
2. Increase in pressure will ALWAYS favour the reaction FORMING THE SMALLER NUMBER OF MOLES

Question 9

What is the effect of adding a catalyst?

Answer 9

A catalyst will increase the rates of both the forward and reverse reactions equally and will therefore not disturb the equilibrium

Question 10

What is the Equilibrium Constant

Answer 10

The equilibrium constant for any reaction in equilibrium is the ratio of the concentration of products to the concentration of the reactants at equilibrium

Question 11

What is :

1. Left out of the Kc equation
2. What affects Kc

Answer 11

1. Solids and Liquids
2. Temperature
   (Kc values are temperature-specific)