Reversible reactions and Equilibrium

Question 1

What is a reversible reaction?

Answer 1

The products of the reaction can react to produce the original reactants.

Question 2

What are the reaction conditions for reversible reactions?

Answer 2

Temperature, Pressure and concentration.

Question 3

What happens if in a reversible reaction, one way is exothermic?

Answer 3

The opposite is endothermic and the same amount of energy is transferred.

Question 4

What is equilibrium?

Answer 4

The rate of the forward reaction is equal to the rate of the backward reaction.

Question 5

What does a catalyst do at equilibrium?

Answer 5

It does not change the position of equilibrium but speeds up the forward and reverse reaction at the same time/

Question 6

What is Le Chatelier’s Principle?

Answer 6

any change made to a reaction which is in equilibrium, will result in the equilibrium position moving to minimise the change made.

Question 7

What is the effect of changing concentration at equilibrium?

Answer 7

If concentration is increased. more products will be formed until equilibrium is reached again. If concentration is decreased more reactants will react until equilibrium is reached again.

Question 8

What is the effect of changing temperature at equilibrium?

Answer 8

Increasing temperature will favour the endothermic reaction. Decreasing temperature will favour the exothermic reaction.

Question 9

What is the effect of changing pressure at equilibrium?

Answer 9

An increase of pressure causes the equilibrium to shift towards the side with the smaller number of molecules.
A decrease of pressure causes the equilibrium to shift towards the side with the larger number of molecules.