Combustion

Question 1

What is crude oil a mixture of?

Answer 1

Crude oil is a mixture of many different hydrocarbons

Question 2

What is a hydrocarbon?

Answer 2

A hydrocarbon is a compound containing only hydrogen and carbon

Question 3

Name 3 things crude oil is used for:

Answer 3

Petrol, diesel, heating houses

Question 4

What is combustion?

Answer 4

Burning a substance in oxygen

Question 5

What is oxidation?

Answer 5

Oxidation is when something gains oxygen

Question 6

What is incomplete combustion?

Answer 6

Incomplete combustion is burning substances in insufficient oxygen

Question 7

When a fuel burns, it reacts with oxygen from the air. What is produced?

Answer 7

Carbon dioxide gas and water vapour are produced, as well as energy.

Question 8

A test for carbon dioxide gas turns limewater what?

Answer 8

Cloudy

Question 9

How can we test for water?

Answer 9

Blue cobalt chloride paper turns pink in the presence of water.

Question 10

When does incomplete combustion occur and what does it form?

Answer 10

Incomplete combustion occurs when a fuel burns in a limited supply of oxygen. Instead of forming carbon dioxide (CO2), you form carbon monoxide or sometimes just carbon (soot).

Question 11

When a candle burns, what chemical reaction happens?

Answer 11

Candle wax + oxygen —> carbon dioxide + water (+ energy)