Edexcel GCSE Chemistry Topic 8 Fuels and Earth science overview quiz quiz

A single pure compound made of one type of molecule

A renewable mixture of alcohols that can be quickly replaced

A finite mixture of hydrocarbons, mostly alkanes

A pure sample of the gas methane on its own

$C_nH_{2n}$

$C_nH_{2n-2}$

$C_nH_n$

$C_nH_{2n+2}$

They contain larger molecules with stronger intermolecular forces

They contain much smaller molecules with weaker forces between them

They are heated far more strongly than the higher fractions are

They are much more flammable than the other fractions collected

Carbon monoxide and water

Carbon dioxide and water

Carbon and hydrogen

Sulfur dioxide and water

Only carbon dioxide and nothing else

Two even longer alkane molecules

A shorter alkane and an alkene

Just water and hydrogen gas

Carbon dioxide and leftover oxygen gas

Nitrogen and oxygen from the air

Only sulfur dioxide and water vapour

Carbon monoxide and carbon (soot)

Sulfur impurities in the fuel

Nitrogen drawn in from the air

Carbon atoms within the fuel itself

Water vapour in the surrounding air

The greenhouse effect

Acid rain

Ozone depletion

Global dimming only

Mostly oxygen, just like the air today

Hydrogen and helium gas, with no other gases

Carbon dioxide with little or no oxygen

Pure nitrogen and nothing else at all

Volcanoes released oxygen

Carbon dioxide turned into oxygen in the oceans

Oxygen leaked from rocks

Plants and algae carried out photosynthesis

78 percent nitrogen, 21 percent oxygen

78 percent oxygen, 21 percent nitrogen

50 percent carbon dioxide, 50 percent oxygen

100 percent nitrogen

Burning fossil fuels in power stations

Farming livestock and growing rice

Planting large numbers of new trees

Generating electricity using solar power