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What is a fuel?

A substance which is burned to produce energy.

Give another word for burning?

Combustion

When a substance burns what is it reacting with?

Oxygen

Name the type of compound found in oil and natural gas.

Hydrocarbons

What is a hydrocarbon?

A compound which

contains hydrogen and carbon only.

Name the two products formed when a hydrocarbon burns in a plentiful

supply of oxygen(complete combustion)

Carbon dioxide and water

What is the test for carbon dioxide?

Limewater turns milky

Name the poisonous gas produced when a hydrocarbon burns in a

limited supply of oxygen (incomplete combustion).

Carbon monoxide

What is produced when nitrogen and oxygen from the air react inside a

petrol engine?

Oxides of nitrogen which are poisonous

What causes nitrogen and oxygen from the air to react inside a petrol

car engine?

Spark

Why is it dangerous to burn fuels containing sulphur compounds?

Sulphur dioxide is produced

(a poisonous gas)

Name the harmful particles produced by the incomplete

combustion of diesel.

Soot

What does a catalytic converter do?

Converts pollutant gases into

harmless gases.

Carbon monoxide into carbon dioxide

Oxides of nitrogen into nitrogen

Name the type of chemicals compounds found in crude oil.

Hydrocarbons

Name the process used to separate crude oil into fractions.

Fractional distillation

What is a fraction?

A mixture of hydrocarbons with similar boiling points

What property allows the hydrocarbons to be separated by

fractional distillation?

They have different boiling points

Which size of hydrocarbon molecules have the largest

boiling point?

largest molecules - as the molecules become

larger the boiling point increases.

Describe what happens to ease of evaporation, viscosity and

flammability as the molecular size increases.

As the molecular size increases

- ease of evaporation decreases

- more viscous(thicker)

- less flammable

Why is lubricating oil more viscous than petrol?

Lubricating oil contains longer hydrocarbons than petrol.

Is air a mixture of gases or a compound?

A mixture of gases

Name the gas which turns lime water milky?

Carbon dioxide

What is the test for oxygen gas?

Relights a glowing splint

Why should sulphur dioxide not be released into the atmosphere?

It causes acid rain

Give a use for the residue fraction.

Tar for roads/roofing

Approximately how many carbon atoms are in the hydrocarbon

molecules used to make petrel?

8 carbons

C8H18

Carbon Compounds 2a Int 2

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