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Improving processes and products

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Question 26

This question is about the extraction and recycling of magnesium.

a.

Magnesium is extracted by electrolysis from its ore, magnesium chloride. Use the reactivity series shown below to explain why magnesium cannot be extracted from its ore by heating with carbon.

  • Potassium (most reactive)
  • Sodium
  • Magnesium
  • Aluminium
  • Carbon
  • Zinc
  • Iron
  • Copper (least reactive)
[2]
b.

Consider the following data on magnesium production:

  • 5.0 kg5.0\text{ kg}5.0 kg of magnesium chloride ore makes 1.0 kg1.0\text{ kg}1.0 kg of magnesium.
  • 320,000 kJ320,000\text{ kJ}320,000 kJ of energy is needed to make 1.0 kg1.0\text{ kg}1.0 kg of magnesium from the ore.
  • 5.0 kg5.0\text{ kg}5.0 kg of scrap magnesium makes 4.5 kg4.5\text{ kg}4.5 kg of recycled magnesium.
  • 16,000 kJ16,000\text{ kJ}16,000 kJ of energy is needed to produce 1.0 kg1.0\text{ kg}1.0 kg of magnesium from recycled magnesium.

Calculate how many times more energy is required to extract 1.0 kg1.0\text{ kg}1.0 kg of magnesium from ore compared to recycling it.

[2]
c.

Describe and explain two advantages of recycling magnesium. Use the information provided to support your answer.

[2]
Markscheme

Improving processes and products Questions

  1. GCSE
  2. /Chemistry
  3. /Improving processes and products

81 exam-style questions on OCR GCSE Chemistry Improving processes and products. Each one has a worked solution and a mark scheme showing where the marks go.

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