Loading…
Loading…
GCSE Combined Science · key term
A finite resource found in rocks, formed from ancient biomass consisting mainly of plankton buried in mud. It is a mixture of a very large number of compounds, most of which are hydrocarbons.
Used by AQA and Edexcel
Specification 5.7.1.1, 5.9.1.4 · Paper 4
Revise: Crude Oil and AlkanesCrude oil is found within rocks in the Earth’s crust, both beneath land and beneath the seabed. It occupies spaces in porous rock rather than forming an underground lake.
A liquid mixture of hydrocarbons formed over millions of years from buried remains of plankton.
Distinguish the starting materials: coal forms from plants, whereas crude oil and natural gas form from plankton.
Create a free account to read GCSE Combined Science revision notes for your exam board and track your progress.
Specification Fuels · Paper 3, Paper 4
A complex, finite mixture of hydrocarbons whose carbon atoms are arranged in chains or rings.
Revise: Crude oil, fractional distillation and crackingCrude oil is not one hydrocarbon: it is a complex mixture of many different hydrocarbons. Their molecules vary in size, and their carbon atoms can be arranged in chains or rings.