AQA A Level Chemistry : Year 1 - Alkanes

AQA A Level Chemistry : Year 1 - Alkanes
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1. What is a source of hydrocarbons? Crude oil (petroleum)

2. What is crude oil (petroleum) ? A mixture consisting mainly of alkane hydrocarbons
which can be separated by fractional distillation

3. How might blockage of the air vents Less energy given out by the fuel
in a combustion engine affect its per- Engine less powerful/efficient
formance?

4. What is fractional distillation? The continual evaporation and condensation of a mix-
ture causing the different components to separate
because they have different boiling points

5. Explain fractional distillation (4 1. Crude oil is heated to a vapour which passes into
steps) the column
2. The column is hotter at the bottom and cooler at
the top
3. Vapours rise up the column and cool, condensing
when they meet their boiling point
4. Short chain alkanes are collected near the top as
they have lower boiling points

6. Give a use of alkanes Fuels

7. What is an alkane? A saturated hydrocarbon

8. What is cracking? The proceds where long chain hydrocarbon mole-
cules are broken into shorter chain molecules which
are in high demand

9. What bond is broken during crack- C-C
ing?

10.
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