Limestone

1. Slaked lime is a common name for which one of the following?

Calcium carbonate Calcium oxide Calcium hydroxide

2. How do you produce calcium oxide from calcium carbonate?

By heating it By adding water to it By neutralising excess acidity

3. Limestone is mostly made of what?

Calcium carbonate Calcium oxide Calcium hydroxide

4. Water is one of the ingredients of concrete. What are the other ingredients?

Clay, sand and crushed rock Soda, sand and crushed rock Cement, sand and crushed rock

5. What is an advantage of using concrete to make building foundations?

It is strong when stretched. It is strong when squashed. It is worn away by acid rain.

6. What is a benefit of a limestone quarry?

There is a lot of dust and noise. There is employment for local people. It causes acid rain.

7. Which of the following is a disadvantage of using glass for windows?

It is transparent. It is tough and difficult to break. It can trap too much heat in a building in the summer.