10

Question 1

Dynamic equilibrium

Answer 1

Dynamic equilibrium is set up when the rate of the forward reaction is equal to the rate of the reverse reaction.

The relative concentrations of the reactants and products remain CONSTANT

Only occurs in a fixed system.

Question 2

Le chateliers principle

Answer 2

If the conditions of dynamic equilibrium in a closed system are changed, the equilibrium shifts to oppose that change

Question 3

Effect of catalyst on equilibrium

Answer 3

A catalyst has NO EFFECT on the position of equilibrium

However, a system will reach equilibrium more quickly

Question 4

Changes in concentration

Answer 4

Shifts right (favours products):

• If reactant is increased
• If product is decreased

Shifts left: (favours reactants):

• If reactant is decreased
• If product is increased

Question 5

Changes in pressure

Answer 5

Only affects dynamic equilibria that contains at least ONE GAS

An increase in pressure favours the side with the fewest moles of gas.

A decrease in pressure favours the side with the GREATEST no of moles

Question 6

Changes in temperature

Answer 6

An INCREASE in temp favours the ENDOTHERMIC reaction

A DECREASE in temp favours the exothermic