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.
87 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.