6.Equilibria

Question 1

Define dynamic equilibrium

Answer 1

When a the forward and reverse reactions of a reversible reaction (in an closed system) proceed at an equal rate so the concentration of the reactants and the products stays the same

Question 2

State La Chatelier’s principle

Answer 2

If a system at equilibrium is disturbed, the equilibrium moves in the direction that tend to reduce the disturbance (disturbance must be specified within context of question)

Question 3

Write the equation for Kc for the equation 2A+B –> C

Answer 3

[A]^2 [B]

Question 4

If equilibria shifts to the left, what effect does it have on Kc? (temperature)

Answer 4

Decreases

Question 5

If equilibria shifts to the right, what effect does it have on Kc? (temperature)

Answer 5

Increases

Question 6

Does concentration have an effect on Kc

Answer 6

No. Kc is a constant provided the temperature stays the same so concertation does not effect Kc. The relationship between the products and the reactants always remains contstant.

Question 7

What effect do catalysts have on the position of equilibrium

Answer 7

No effect. They affect the forward and backward reaction equally