Unit 1 Section 6: Equilibria And Redox Reactions

Question 1

State Le Chatelier’s principle.

Answer 1

If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change

Question 2

State the meaning of the term “catalyst” and explain how they work

Answer 2

A catalyst is a substance that increases reaction rate without being used up. They provide an alternate route for reaction that has lower activation energy

Question 3

What effect does a catalyst have on time taken to reach equilibrium?

Answer 3

Increase

Question 4

State the effect, if any, of a catalyst on the position of equilibrium.

Answer 4

None

Question 5

State the effect of a decrease in temperature on yield in an exothermic reaction.

Answer 5

The forward reaction gives out heat. This means the position of equilibrium shifts to the right to oppose the decrease.

Question 6

Give 2 features of a reaction at equilibrium.

Answer 6

The forward and reverse rates are the same

Concentrations of reactions and products remain the same