Equillibrium

Question 1

State Lé Chateliers principle

Answer 1

If an external condition is changed the equilibrium will shift to counteract that change

Question 2

What occurs during a reversible reaction at equilibrium?

Answer 2

Forward and backwards reactions occur at equal rates

The concentrations of reactants and products stays constant

Question 3

List the factors that affect the position of equilibrium

Answer 3

Temperature
Pressure
Concentration
catalysts

Question 4

How does changing temperature affect the position of equilibrium?

Answer 4

If the temperature has been increased the equilibrium will shift to oppose this and move in the endothermic direction to reduce the temperature by absorbing the heat.

If the temperature is decreased the equilibrium will shift to oppose this and move in the exothermic reaction to increase temperature by giving out heat.

Question 5

How does change in concentration affect the position of equilibrium?

Question 6

How does the change in pressure affect the position of equilibrium?

Answer 6

Increasing pressure will cause the equilibrium to shift towards the side with fewer moles of gas to oppose the change and reduce pressure.

Decreasing pressure will cause the equilibrium to shift to the side with more moles to oppose change and increase pressure.

If the moles are equal changing pressure has no effect on the position of equilibrium

Question 7

How does adding a catalyst affect the position of equilibrium?

Answer 7

No affect on the position however it speeds up the rate at which equilibrium is reached

Question 8

What is the Kc representation?

Answer 8

Question 9

What is the unit for concentration?

Question 10

What two factors do not affect the value of the equilibrium constant?