A student investigates the rate of reaction between a fixed mass of magnesium ribbon and an excess of 1.0 mol dm-3 ethanoic acid.
Which of the following modifications to the procedure would increase the initial rate of this reaction?
Replacing the 1.0 mol dm−31.0\text{ mol dm}^{-3}1.0 mol dm−3 ethanoic acid with 1.0 mol dm−31.0\text{ mol dm}^{-3}1.0 mol dm−3 hydrochloric acid
Doubling the volume of the 1.0 mol dm−31.0\text{ mol dm}^{-3}1.0 mol dm−3 ethanoic acid
Performing the reaction in a larger conical flask to increase the headspace volume
Using a thicker magnesium ribbon of the same mass
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.