Chemical Equilibrium

Question 1

A Reversible Reaction

Answer 1

Can go in either the forward or reverse directions

Question 2

Chemical Equilibrium

Answer 2

A state of dynamic balance where the rate of the forward reaction is equal to the rate of the reverse reaction

Question 3

Le Chataliers Principle

Answer 3

If a stress is applied to a system at equilibrium, the system adjusts to reduce the stress.

Question 4

Change Concentration

Answer 4

Increase- shifts to opposite side
Decrease- Shifts to same side

Question 5

Change Pressure

Answer 5

Increase- Shifts to side with the least amount of molecules
Decrease- shifts to the side with the most molecules
NOTE: Change in pressure only effects gaseous equilibrium reactions
NOTE: If molecules on both sides are equal, change in pressure has NO effect.

Question 6

Change Temperature

Answer 6

Heat Up- will want to cool down so favours the endothermic direction
Cool down- will want to heat up so favours the exothermic direction

Question 7

Change Catalyst

Answer 7

Catalyst will not change the position of equilibrium but will help reach equilibrium sooner

Question 8

Ammonia is produced using

Answer 8

The Haber process
Catalyst - Iron catalyst

Question 9

Sulphuric acid produced using

Answer 9

The contact process
Catalyst- vanadium pentoxide

Question 10

Kc only effected by

Answer 10

temperature

Question 11

Kc =

Answer 11

[LHS]