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GCSE Chemistry · key term
A naturally occurring mixture made mainly of many different hydrocarbons.
Used by Edexcel and OCR
Specification 8.2, 8.15 · Paper 2
A naturally occurring fossil fuel that is a complex mixture of hydrocarbons.
Revise: Crude OilCrude oil is not one pure substance with a single chemical formula. It is a complex mixture, meaning that it contains a large number of different substances mixed together. Its precise composition can therefore vary.
A finite fossil-fuel resource made from a complex mixture of hydrocarbons.
Specification C6.2j, C6.2m, C6.2n · Paper 2 (Foundation), Paper 4 (Higher)
A mixture of hydrocarbons extracted from the Earth.
Revise: Crude Oil SeparationCrude oil is not one substance. It is a mixture of many hydrocarbons, which are compounds made only of carbon and hydrogen. These hydrocarbons have different boiling points, so they can be separated into useful groups called fractions.
An unrefined mixture made up mainly of different hydrocarbons.
A naturally occurring mixture containing many different hydrocarbons.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Crude oil as a sourceCrude oil is one of our main sources of hydrocarbons. A hydrocarbon is a compound made of carbon and hydrogen only. Crude oil is not one pure compound: it is a mixture of many different hydrocarbons, whose molecules vary in size.
A naturally occurring mixture of hydrocarbons extracted from underground or beneath the sea.
A mixture of many different hydrocarbons found beneath the Earth's surface.
Do not call crude oil a single compound: describe it as a complex mixture of hydrocarbons.
“Finite” means the supply is limited; it does not simply mean that crude oil is expensive or difficult to obtain.
Keep the origins separate: petrol, kerosene and diesel oil are obtained from crude oil, whereas methane is found in natural gas.
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