Equilibrium

Question 1

Forward reaction

Answer 1

Initially reactants are used up but then slow as their concentration drops

Question 2

Dynamic equilibrium

Answer 2

Rate of forwards reaction = backwards

Conc of each substance remains constant - only in a closed system

Backward reaction - initially reactants are reformed slowly but then speed up as conc of products increases

Question 3

Le chateliers principle

Answer 3

If a reaction at equilibrium is subjected to a change in pressure, temperature or concentration, the position of equilibrium will move to counteract the change

Question 4

Change in condition resulting in shift to left

Answer 4

Make more reactants

Question 5

big value for Kc

Answer 5

higher conc of B

so, position of equilibrium is to the right (forward reaction favoured)

Question 6

increasing reactant concentration

Answer 6

equilibrium shifts to the right to use it up and reduce concentration

more products produced

Question 7

increasing pressure

Answer 7

equilibrium shifts to side with fewest number of gas particles to reduce pressure

Question 8

increasing temp

Answer 8

makes equilibrium shift to endothermic direction to reduce temp

more reactants produced

Question 9

catalysts

Answer 9

have no effect on position of equilibrium

will speed up rate of forward and backward reaction equally