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6.1 Improving processes and products

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Question 54

Identical uncoated steel springs are kept for 12 days in sealed containers at the same temperature.

ContainerOxygen presentWater vapour presentSurface of spring covered by rust after 12 days
PYesNo0%
QNoYes0%
RYesYes35%
a.

Use the results to explain which two substances are needed for steel to rust.

[3]
b.

A fourth spring is kept for 12 days with oxygen and droplets of salt water present. Predict how the percentage of its surface covered by rust would compare with spring R. Explain your answer.

[2]
Markscheme

6.1 Improving processes and products Questions

  1. GCSE
  2. /Chemistry
  3. /6.1 Improving processes and products

136 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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