Topic 10 and 11

Question 1

Dynamic equilibrium

Answer 1

State in which the rates of the forward and backward reactions are equal and the concentrations of the reactants and the products remain constant.

Question 2

Yield

Answer 2

The concentration of the desired product at equilibrium

Question 3

To check whether an experiment is long enough to reach equilibrium

Answer 3

Repeat
Leave for longer than that time
The titre value/Kc value/concentration of reactants and products should remain unchanged

Question 4

Expression for Kc

Answer 4

products / reactants to power of balancing numbers

Question 5

Position of equilibrium and Kc

Answer 5

Larger Kc, eqm more right

Smaller value of Kc, eqm more left

Question 6

Factors that affect Kc value

Answer 6

Only temperature!!

Question 7

Kc value when you reverse the reaction

Answer 7

1/Kc

Question 8

Kc value when you x2 the reaction

Answer 8

Kc squared

Question 9

Kc value when you add a different equation

Answer 9

Kc1 x Kc2

Question 10

Mole fraction of gas A equation

Answer 10

number of moles of gas A / total number of moles of gasses

Question 11

Partial pressure definition

Answer 11

The pressure the gas would exert if it occupied the container alone (same units as the eqm pressure given in question)

Question 12

Total pressure equation

Answer 12

Sum of individual partial pressures

Question 13

Partial pressure of A equation

Answer 13

mole fraction of A x total pressure

Question 14

Expression for Kp

Answer 14

Partial pressures of products multiplied / partial pressures of reactants multiplied to the power of the balancing numbers

Question 15

What happens when the initial concentration of a substance of in a reaction is changed?

Answer 15

The Kp/Kc values do not change, because they are only affected by a change in temperature
But the concentrations of other reactants and products change to keep the Kp/Kc value constant (to restore the ratio)