Unit 2- Fuels: Combustion

Question 0

What is combustion?

Answer 0

Another word for burning

Question 1

What is a fuel?

Answer 1

A chemical which is burned to produce energy

Question 2

What happens when a substance burns?

Answer 2

It reacts with oxygen

Question 3

What mainly makes up oil and natural gases?

Answer 3

Chemical compounds called hydrocarbons

Question 4

What are hydrocarbons made of?

Answer 4

Hydrogen and carbon only

Question 5

What conditions do hydrocarbons burn?

Answer 5

When there is a plentiful supply of oxygen

Question 6

What do hydrocarbon produce when they burn?

Answer 6

Carbon dioxide and water

Question 7

What is the test for carbon dioxide?

Answer 7

It turns limewater from colourless to milky

Question 8

What happens when a hydrocarbon burns in an insufficient supply of oxygen?

Answer 8

Poisonous carbon monoxide gas and carbon soot is formed

Question 9

What are nitrogen oxides?

Answer 9

Poisonous gases

Question 10

How are nitrogen oxides formed?

Answer 10

When nitrogen and oxygen from the air react inside a petrol engine

Question 11

How is sulphur dioxide formed?

Answer 11

When some fuels containing traces of sulphur burn

Question 12

What is sulphur dioxide?

Answer 12

A poisonous gas which is released into the atmosphere

Question 13

How are soot particles formed?

Answer 13

In he incomplete combustion of diesel

Question 14

Is soot harmful?

Answer 14

Yes

Question 15

How can the air pollution from combustion of hydrocarbons be reduced?

Answer 15

The use if catalytic converters which speed up the conversion of pollutant gases to harmless gases