Fuels

Question 1

Alkenes are unsaturated hydrocarbons.

State what is meant by unsaturated

Answer 1

The molecule contains a double bond between

carbon atoms

Question 2

Describe what is seen when ethene is passed into bromine water

Answer 2

Colour change from orange to colourless

Question 3

Explain what is meant by cracking

Answer 3

using heat to decompose large hydrocarbon molecules into smaller, more useful molecules

Question 4

Molecules of ethene are reacted together to form poly(ethene). State the name of the type of reaction

Answer 4

Polymerisation

Question 5

Describe how the composition of the
atmosphere is affected by burning fossil
fuels

Answer 5

Adds carbon dioxide/water vapour (1) and

removes oxygen

Question 6

Describe what is meant by an homologous

series

Answer 6

A chemical group with the same general
formula, similar chemical properties, gradual
variation in physical properties

Question 7

Explain what is meant by a hydrocarbon

Answer 7

A compound of carbon and hydrogen ONLY

Question 8

Give the name of the process used to

separate crude oil into fractions

Answer 8

Fractional distillation

Question 9

What must all fuels do?

Answer 9

Produce heat energy when they burn

Question 10

Crude oil is a finite resource. What does

this mean?

Answer 10

It will run out