chapter 19 - equilibrium

Question 1

mole fraction calculation

Answer 1

mole fraction x(A) = moles of A / total moles of gas

Question 2

partial pressure (p) calculation

Answer 2

p(A) = x(A) x P where P is the total pressure exerted

Question 3

Kp where aA + bB ⇋ cC + dD

Answer 3

Kp = p(C)c x p(D)d / p(A)a x p(B)b

Question 4

effect of increasing temperature on Kc (forwards reaction in endothermic)

Answer 4

equilibrium shifts to the right, so Kc increases yield of product increases and yield of reactant decreases

Question 5

effect of increaing temperature on Kc (forwards reaction is exothermic)

Answer 5

equilibirum shifts to the left so Kc decreases yield of product decreases and yield of reactant increases

Question 6

explanation of change in position of equilibrium in terms of Kc

Answer 6

• Kc is not affected by [blank] - if [blank] is increased, the ratio of [blank]/[blank] is [more/less] than Kc - the [blank] must change to maintain Kc - so [blank] gets bigger and [blank] gets smaller - so equilibrium shifts to the [left/right] but Kc remains the same