Edexcel GCSE Combined Science CC8 Fuels and Earth science overview quiz quiz

A compound made of only hydrogen and oxygen

A mixture of two or more different metals

A compound of hydrogen and carbon only

A type of strong corrosive acid

Different colours

Different densities only

Different charges

Different boiling points

Carbon dioxide and water

Carbon monoxide and water

Soot and hydrogen

Sulfur dioxide and water

Carbon dioxide gas

Carbon monoxide

Oxygen gas

Nitrogen gas

Carbon dioxide gas and water vapour

Oxygen and nitrogen from the air

Sulfur dioxide and nitrogen oxides

Carbon monoxide and tiny soot particles

More flammable and much more volatile than before

Lighter in colour and runnier than the smaller fractions

A gas at room temperature with a very low boiling point

More viscous with a higher boiling point

Volcanoes

Photosynthesis

Burning fossil fuels

Meteorites only

Volcanoes released large amounts of oxygen gas

Algae and plants carried out photosynthesis

Oxygen slowly leaked out from deep inside the rocks

Carbon dioxide gas gradually turned itself into oxygen

78% oxygen, 21% nitrogen

50% nitrogen, 50% oxygen

78% nitrogen, 21% oxygen

90% carbon dioxide, 10% oxygen

They block all of the incoming sunlight from ever reaching the Earth's surface

They produce heat directly by reacting chemically with one another

They cool the upper atmosphere and trap the cold air near the ground

They absorb heat radiated by the Earth and re-emit some back to the surface

Methane

Nitrogen

Oxygen

Argon

It slowly escaped from the atmosphere out into outer space

It dissolved in the oceans and was used in photosynthesis

It gradually turned itself into nitrogen gas over time

Volcanoes absorbed it back down beneath the surface again