Topic 5 - Reversible Reactions (Paper 2)

Question 1

what is equilibrium?

Answer 1

the concentrations of reactants and products reaching a balance

Question 2

what is a closed system?

Answer 2

a system where no reactants or products can be released

Question 3

what does dynamic equilibrium mean?

Answer 3

reactions are still taking place in both directions, but there is no overall effect as the reactions cancel each other out

Question 4

what does the position of equilibrium mean?

Answer 4

the relative amounts of reactants and products

Question 5

what happens if you change the temperature of a reversible reaction?

Answer 5

if you raise the temperature, the endothermic reaction will increase to use up the extra heat
if you reduce the temperature, the exothermic reaction will increase to give out more heat

Question 6

what happens if you change the pressure of a reversible reaction?

Answer 6

if you raise the pressure it will encourage the reaction which produces fewer moles of gas
if you lower the pressure it will encourage the reaction which produces more moles of gas

Question 7

what happens if you add a catalyst to a reversible reaction?

Answer 7

nothing changes, as it speeds up the forward and backward reaction by the same amount