Limestone [GCSE Chemistry only] test questions - WJEC - GCSE Chemistry (Single Science) Revision

1

What is the main chemical compound in limestone?

Silicon oxide

Iron oxide

Calcium carbonate

2

What is the correct chemical name for the substance more commonly known as ‘quicklime’?

Calcium oxide

Calcium hydroxide

Calcium carbonate

3

What is the correct balanced symbol equation for the formation of solid slaked lime?

CaO(s) + H₂O(l) → 2CaOH₂(s)

CaO(s) + H₂O(l) → Ca(OH)₂(aq)

CaO(s) + H₂O(l) → Ca(OH)₂(s)

4

Which of the following is a use of limestone?

Removal of impurities from the blast furnace

Heating with cement to make clay

Neutralising alkaline soil for agriculture

5

Which of the following is an economic advantage of limestone quarrying?

Improved transport links

New jobs created for the local population

An artificial barrier from natural materials around the quarry to minimise noise pollution

6

Which of the following effects of quarrying is an environmental disadvantage?

The extra traffic and noise pollution would make nearby settlements less desirable to live in

Quarrying destroys the natural landscape and any wildlife habitats within the area

The dust and the pollution from the extra traffic could cause health problems

7

Copper carbonate is a green solid which can be thermally decomposed easily by heating it with a Bunsen burner. The green colour disappears and a black solid is formed. A colourless gas is also formed. What is the black solid that is formed?

Copper hydroxide

Copper oxide

Copper carboxylate

8

Place the flame of a lighted splint into a test tube of this gas - the gas will ignite with a squeaky pop

Put a glowing splint into a test tube filled with this gas - the glowing part of the splint will re-ignite

Bubble the gas through limewater - the limewater will turn milky

9

Why does copper carbonate decompose at a much lower temperature than potassium carbonate?

Potassium is a less reactive metal than copper

There are twice as many potassium atoms than there are copper atoms, so twice as much heat energy is required

Potassium is more reactive than copper

10

When a small amount of water is added to a solid piece of calcium oxide, it crumbles to form a powdery white solid of calcium hydroxide. During the reaction it fizzes, and it appears that a small amount of white ‘smoke’ rises from the reaction whenever you add a drop of water. How would you explain these observations?

This is a highly exothermic reaction so the heat energy released boils the water from steam

This is a highly endothermic reaction and so the heat energy absorbed causes water vapour in the air to condense

This reaction also forms a white gas as part of the reaction and looks like smoke