Diagnosis test: EdexcelCORE Science Crude oil (15 marks)

  1. What is an alkane? (circle the correct answer)
  1. A saturated hydrocarbon with single C-C bonds.
  2. An unsaturated hydrocarbon with double C=C bonds.
  3. A saturated hydrocarbon with double C=C bonds.
  4. An unsaturated hydrocarbon with single C-C bonds.

(1mark)

  1. Use some of the words below to fill in the gaps.

Crude oil is a mixture consisting of different elements and compounds that are not

chemicallybondedtogether. Crude oil is primarily made up of molecules containing

carbonand hydrogen. The mixture can be separated by fractionaldistillation.

(3 mark)

  1. Explain how fractional distillation separates crude oil.

Crude oil is heated in a fractionating column.

As it reaches its boiling point it evaporates.

The vapour condenses at different temperatures.

(3 marks)

  1. Name the products of complete combustion.

Carbon dioxide

Water

(2 marks)

  1. QWC: Discuss the types of pollution caused by burning fossil fuels.

QWC Suggested marking guidance (Total 6 marks)
Marks awarded for this answer will be determined by the Quality of Written Communication (QWC) as well as the standard of the scientific response. Teachers should and apply a ‘best-fit’ approach to the marking.
0 marks / Level 1 (1-2 marks) / Level 2 (3-4 marks) / Level 3 (5-6 marks)
No relevant content. / At least one type of pollution is mentioned.
The spelling, punctuation and grammar are very weak. / Two types of pollution are mentioned and at least one is discussed.
There is reasonable accuracy in spelling, punctuation and grammar, although there may still be some errors / All three types of pollution are mentioned and fully discussed.
The answer shows almost faultless spelling, punctuation and grammar.
  • Burning fossil fuels such as coal, gas or oil
  • Can produce carbon dioxide
  • Which causes climate change and global warming
  • Some fuels like coal contain sulphur so it can also produce sulphur dioxide
  • Which causes acid rain
  • Carbon particle
  • Which cause soot in the air can lead to breathing problems
  • Carbon monoxide
  • This is a toxic gas

(6 marks)

1

© Copyright The PiXL Club Ltd, 2016