1.1. Limestone is a rock which consists mostly of calcium carbonate. The diagram shows a cycle of reactions involving limestone.

i) When limestone is heated, calcium carbonate is converted to calcium oxide and carbon dioxide.

I. State the name for this type of reaction.

[1]

II. Write a balanced symbol equation for the reaction.

[2]

......................................... → ........................................... + .........................................

ii) State what must be added to calcium oxide to form calcium hydroxide.

[1]

1.2. Give one use of limestone in the construction industry