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6.1 Improving processes and products

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Question 56

A steel flood barrier is in contact with salt water. Magnesium blocks are attached to the steel. The steel must remain protected at all times.

The blocks are inspected every two years. Measurements show that each block loses mass at a constant rate.

Time after fitting (years)Mass of each magnesium block (kg)
08.0
25.2
42.4

Explain how the magnesium blocks prevent the steel from rusting and use the data to decide at which scheduled inspection the blocks should first be replaced.

[4]
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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