M3- Equilibrium

Question 1

Answer 1

D

Question 2

Answer 2

B

Question 3

If a reversible reaction is shown as:
aA + bB cC + dD
what is the Kc expression?

Answer 3

Kc = [C]^c x [D]^d / [A]^a x [B]^b

Question 4

What is Le Chatelier’s principle?

Answer 4

When a system in dynamic equilibrium is subjected to change, the equilibrium
position will shift to minimise the change (1)

Question 5

Answer 5

B

Question 6

Answer 6

B

Question 7

When does the value of Kc change?

Answer 7

If the temperature changes

Units change depending on the reaction

Question 8

Answer 8

C

Question 9

Answer 9

B

Question 10

Answer 10

D

Question 11

Write a Kc expression for this reaction:

H2 + I2 ↔ 2HI

Answer 11

Kc = [HI]2 / [H2] [I2]

Question 12

Answer 12

D

Question 13

What is the effect of a catalyst on equilibrium?

Answer 13

Does not change the position

Speeds up the rates of forward and reverse reactions equally

Question 14

Answer 14

C

Question 15

What are key features of a reaction in ‘dynamic equilibrium’?

Answer 15

Exists in a closed system (1) when the rate of the forward reaction is equal to the rate of the reverse reaction (1) and the concentrations of reactants and products do not change (1)

Question 16

Answer 16

A