Chemistry Test

When limestone is heated it forms lime (calcium oxide) and carbon dioxide.

CaCO₃(s) → CaO(s) + CO₂(g)

Which statement is not correct?

• Carbon dioxide is a greenhouse gas which may contribute to climate change

• Slaked lime is used to neutralise industrial waste

• The lime can be used to treat alkaline soil

• This reaction is an example of thermal decomposition

Which process is used to make lime (calcium oxide) from limestone (calcium carbonate)?

• chromatography

• electrolysis

• fractional distillation

• thermal decomposition

A student is asked to draw a diagram showing the uses of limestone.

Which numbered lines show a correct use of limestone?

• 1, 2 and 3

• 1 and 2 only

• 1 and 3 only

• 2 and 3 only

The diagram represents a lime kiln.

What leaves the furnace at X?

• calcium carbonate

• calcium hydroxide

• calcium oxide

• calcium sulphate

The diagram shows the soil pH range over which a vegetable grows well.

The pH of the soil to be used is 5.5.

Why is lime added to the soil before planting the vegetable?

• The lime acts as a catalyst.

• The lime changes the soil acidity.

• The lime is an indicator.

• The lime supplies nitrogen.

A new planet has been discovered and its atmosphere has been analysed. The table shows the composition of its atmosphere.

Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth’s atmosphere?

• carbon dioxie and oxygen

• carbon dioxide only

• nitrogen and oxygen

• nitrogen only

Which pollutant found in air does not have an effect on respiration?

• carbon monoxide
• lead compounds
• oxides of nitrogen
• sulphur dioxide

Sulfur dioxide, carbon monoxide and oxides of nitrogen are common gaseous pollutants found in the air.

Which pollutants contribute to acid rain?

• carbon monoxide and sulphur dioxide

• oxides of nitrogen and sulphur dioxide

• oxides of nitrogen only

• sulphur dioxide only

A farmer moves his cows into a concrete shelter for protection.

There is little access for fresh air once the door is closed.

Which gases would increase in amount in the shelter?

• carbon dioxide and carbon monoxide

• carbon monoxide and oxygen

• carbon dioxide and methane

• methane and oxygen

The pollutants released into the air from car exhausts and some power stations include oxides of the type XO and YO₂.

What are X and Y?

• X = carbon only

  Y = nitrogen only

• X = carbon only

  Y = nitrogen and sulphur only

• X = carbon and nitrogen

  Y = carbon and nitrogen only

• X = carbon and nitrogen

  Y = carbon, nitrogen and sulphur