Chemical equilibrium

A reaction that can go in both directions is called:

• 1 Irreversible
• 2 Reversible
• 3 Slow
• 4 Explosive

At equilibrium, the rates of the forward and backward reactions are:

• 1 Different
• 2 Zero
• 3 Infinite
• 4 Equal

In the Haber process, the product is:

• 1 Ammonia
• 2 Methane
• 3 Nitric acid
• 4 Sulphuric acid

Increasing the pressure on N2 + 3H2 giving 2NH3 shifts the equilibrium:

• 1 To the left
• 2 To the right
• 3 It stops
• 4 It does not shift

A catalyst in an equilibrium reaction:

• 1 Changes the equilibrium position
• 2 Speeds up reaching equilibrium
• 3 Increases the yield
• 4 Is used up

An equilibrium that has the same rates in both directions at constant conditions is called:

• 1 Equilibrium of forces
• 2 Boiling
• 3 Dynamic equilibrium
• 4 Static equilibrium

Adding more reactant to a system at equilibrium shifts it towards the:

• 1 Catalyst
• 2 Reactants
• 3 Products
• 4 No shift

The Haber process uses a temperature of about 450 degrees C because:

• 1 It makes ammonia solid
• 2 It is the lowest temperature possible
• 3 It stops the reaction
• 4 It balances rate and yield

A reaction that goes to completion in one direction is:

• 1 At equilibrium
• 2 Reversible
• 3 Catalysed
• 4 Irreversible