equilibria

Question 1

what are reversible reactions

Answer 1

reaction that can go backwards and forwards

Question 2

what is dynamic equilibrium

Answer 2

when the rate of the forwards reaction equals rate of backwards reaction. the conc of each substance remains constant

Question 3

dynamic equilibrium only occurs in ..

Answer 3

closed systems

Question 4

what is le chateliers principle

Answer 4

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

Question 5

what happens when increasing concentration

Answer 5

if we increase conc of substance on the left then equilibrium will shift to the right and the right hand substances will be produced more
and vice versa

Question 6

what happened when increase pressure

Answer 6

if we increase pressure, equilibrium will shift to side with fewest number of gas particles, this will reduce the pressure
and vice versa

Question 7

what happens when temperature increases

Answer 7

if we increase temperature, equilibrium will shift in endothermic direction, reducing temperature

Question 8

is the forward reaction exothermic or endothermic

Answer 8

exothermic

Question 9

what happens to equilibrium with catalysts

Answer 9

catalysts will speed up rate at which equilibrium is reached but have no effect on position of equilibrium or yield. speeds up both forward and backward reaction equally

Question 10

how to work out Kc (equilibrium constant)

Answer 10

products divided by reactants - powers are the molar values

Question 11

what effects kc

Answer 11

temperature- if temp change means equilibrium shifts to right, kc will increase
temperature- if temp change means equilibrium shifts to left, kc will decrease

concentration doesn’t effect value of kc

catalyst doesn’t have effect on value of kc