4.2 Equilibria

Question 1

Kc=

Answer 1

[products]^x /[reactants]^y

Question 2

A + B 2C

Initial Moles: 1.0 1.0 0

Equilibrium Moles: 0.4 X Y

What is the value of X and Y?

Answer 2

X = 0.4
Y = 1.2

Question 3

How does a catalyst affect the Kc?

Answer 3

No effect, because it increases both sides of the equilibrium by the same amount, so it have no effect on the Kc

Question 4

How does the concentration affect the Kc?

Answer 4

(At a constant temperature) has no effect on the Kc. If you increase the concentration of a substance the Kc will theoretically be affected. But the Kc must remain the same at constant temperature, so the concentrations change to keep the equilibrium constant the same.

Question 5

How does an increase in temperature affect an exothermic reaction?

Answer 5

It reduces the Kc

Question 6

How does an decrease in temperature affect an exothermic reactions?

Answer 6

It increases the Kc

Question 7

How does an increase in temperature affect an endothermic reaction?

Answer 7

It increases the Kc

Question 8

How does an decrease in temperature affect an endothermic reaction

Answer 8

It reduces the Kc

Question 9

What is Kc?

Answer 9

The equilibrium, constant calculated for equilibrium concentrations for a system at constant temperature.