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6.1 Improving processes and products

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Question 19

Compound AB\mathrm{AB}AB is manufactured from the gaseous elements A2\mathrm{A_2}A2​ and B2\mathrm{B_2}B2​.

A2(g)+B2(g)⇌2AB(g) \mathrm{A_2(g) + B_2(g) \rightleftharpoons 2AB(g)} A2​(g)+B2​(g)⇌2AB(g)

The forward reaction is exothermic. The reaction is carried out at a constant pressure.

Temperature (°C)A2\mathrm{A_2}A2​ converted at equilibrium (%)Relative rate of reaction
320682
4204315
5202562

The reactor operates at 420 °C.

Explain why 420 °C is a suitable operating temperature. Use values from the table.

[3]
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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