WJEC GCSE Science Double Award Organic and industrial chemistry (Unit 5) overview quiz quiz

A single pure compound

A type of metal

A mixture of hydrocarbons

A mixture of metals

By a chemical reaction

By fractional distillation based on boiling point

By adding acid

By electrolysis

It decreases

It stays the same

It increases

It becomes zero

A hydrocarbon with a carbon-carbon double bond

A type of polymer

A metal compound

A saturated hydrocarbon with only single bonds

It stays orange

It turns from orange to colourless

It turns blue

It turns black

To join small molecules into large ones

To break large molecules into smaller, more useful ones

To remove sulfur from oil

To make crude oil

Metals

Polymers (plastics)

Acids

Salts

A single arrow

A double arrow

An equals sign

A plus sign

The reaction has stopped

The forward and backward reactions go at the same rate

There are equal amounts of reactants and products

Only the forward reaction happens

Carbon and oxygen

Sodium and chlorine

Iron and water

Nitrogen and hydrogen

Platinum

Iron

Nickel

Copper

A high temperature would give more ammonia

It is a compromise between a good yield and a fast enough rate

Ammonia only forms above 450 C

To stop the catalyst working

Plastics

Fertilisers

Fuels

Glass

They dissolve in water

They are not biodegradable, so they last a long time

They react with air

They are radioactive