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Rates of reaction

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Question 80

An industrial chemist investigates the rate of reaction between hydrogen gas and iodine vapor:

H2(g)+I2(g)→2HI(g) \text{H}_2\text{(g)} + \text{I}_2\text{(g)} \rightarrow 2\text{HI(g)} H2​(g)+I2​(g)→2HI(g)

The chemist repeats the reaction at a significantly higher pressure, while keeping the temperature and the initial quantities of the reactants constant.

Explain, in terms of collision theory, why increasing the pressure increases the rate of this reaction.

[2]

Rates of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /Rates of reaction

Practise Edexcel GCSE Chemistry Rates of reaction with exam-style questions for Foundation and Higher tier. 166 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank