C1 4 Crude oil & fuels - answers
Across
6. Gaseous pollutants given off from motor vehicles, a cause of acid rain. Nitrogen
oxides
8. A way to distil liquids from a mixture of liquids by boiling off the substances at
different temperatures, then condensing and collecting the liquids. fractional
12. The reflection of sunlight by tiny solid particles in the air. Global dimming
16. Easily ignited and capable of burning rapidly. flammable
17. A saturated hydrocarbon with the general formula CnH2n+2. alkane
18. When some elements or compounds are mixed together and intermingle but do not
react together (i.e. no new substance is made). mixture
21. A toxic gas whose formula is CO. Carbon monoxide
Down
1. Fitted to exhausts of vehicles to reduce pollutants released. Catalytic converter
2. A toxic gas whose formula is SO2. It causes acid rain. Sulphur dioxide
3. Small solid particle given off from motor vehicles as a result of incomplete
combustion of its fuel. particulate
4. A compound containing only hydrogen and carbon. hydrocarbon
5. Hydrocarbons with similar boiling points separated from crude oil. fraction
7. Combustion when a fuel burns in insufficient oxygen, producing carbon monoxide as a
toxic product. incomplete
9. A reaction where oxygen is added to a substance (or when electrons are lost from a
substance). oxidised
10. The process of burning. combustion
11. Separation of a liquid from a mixture by evaporation followed by condensation.
distillation
13. Fuel made from animal or plant products. biofuel
14. The increasing of the average temperature of the Earth. Global warming
15. Describes a hydrocarbon that contains as many hydrogen molecules as possible in
each molecule. saturated
19. The resistance of a liquid to flowing or the ‘thickness’ or resistance of a liquid to
pouring. viscosity
20. Fuels for cars made from plant oils. biodiesel
Dr Barker 2011