Chemical Equilibrium GCSE

In a system at equilibrium, how do the rates of the forward and reverse reactions compare?

• The rate of the forward reaction is greater

• The rate of the reverse reaction is greater

• The rates of the forwards and reverse reactions are equal

In the Contact Process, sulfur dioxide is converted into sulfur trioxide and the following equilibrium is set up:

If sulfur dioxide is added to the mixture, what happens to the position of the equilibrium?

• The equilibrium shifts to the right

• The position of the equilibrium remains unchanged

• The equilibrium shifts to the left

In the Contact Process, sulfur dioxide is converted into sulfur trioxide and the following equilibrium is set up:

If a catalyst is added to the mixture, what happens to the position of the equilibrium?

• The equilibrium shifts to the right

• The position of the equilibrium remains unchanged

• The equilibrium shifts to the left

In the Contact Process, sulfur dioxide is converted into sulfur trioxide and the following equilibrium is set up:

If the pressure was increased in the above reaction, what happens to the position of the equilibrium?

• The equilibrium shifts to the right

• The position of the equilibrium remains unchanged

• The equilibrium shifts to the left

In the Haber process, ammonia (NH₃) can be produced from nitrogen and hydrogen. How would increasing the temperature effect the position of equilibrium?

N2(g)+3H2(g)⇌2NH3(g)(ΔH= −92.22kJmol−1)

• The equilibrium shifts to the right

• The position of the equilibrium remains unchanged

• The equilibrium shifts to the left

Look at this reaction.

CO(g)+3H2(g)⇌CH4(g)+H2O(g)ΔH=−206kJmol−1

What would be the best conditions for increasing the yield of methane?

• Low temperature; low pressure

• Low temperature; high pressure

• High temperature; high pressure

If hydrochloric acid is added to the mixture, what will happen to the position of equilibrium?

• The equilibrium shifts to the right

• The position of the equilibrium remains unchanged

• The equilibrium shifts to the left

If sodium hydroxide is added to the mixture, what will happen to the position of equilibrium?

• The equilibrium shifts to the right

• The position of the equilibrium remains unchanged

• The equilibrium shifts to the left

Which of the following factors would not affect the equilibrium position for the reaction shown?

AgCl(s)⇌Ag+(aq)+Cl−(aq)

• Addition of silver nitrate

• Increasing the pressure

• Removal of chloride ions

Which of the following is true of equilibrium when a catalyst is added?

• It changes the position at equilibrium

• Equilibrium will be reached more quickly

• No effect on the reaction at all