AQA GCSE Chemistry

Topic Questions

7.1 Hydrocarbons: Fuel & Feedstock

11 mark

Heptane is an alkane with seven carbons.

What is the chemical formula of heptane?

  • C7H10

  • C7H12

  • C7H14

  • C7H16

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21 mark

A laboratory experiment to separate crude oil is shown below.

gV0sXTRL_q2

Which row is correct? 

  The process taking place at X The process taking place at Y
A decomposition condensation
B evaporation reduction
C distillation reduction
D evaporation condensation

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31 mark

The complete combustion of pentane, C5H12, takes place in the following unbalanced equation:

_C5H12   +   _O2 →   _CO2   +  _H2O

What numbers will balance the reaction?

  • 1,4,5,3

  • 1,8,5,6

  • 2,8,5,6

  • 2,4,5,6

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41 mark

Which molecule can be cracked to produce hexane, C6H14?

  • C4H8

  • C4H10

  • C6H12

  • C10H22

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51 mark

Which of the following is true about the properties of hydrocarbons and increasing molecular size? 

  Boiling Point Viscosity Flammability
A decreases decreases increases
B increases decreases increases
C increases increases decreases
D decreases increases increases

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