An aqueous reaction is carried out between sodium thiosulfate solution and a limiting volume of hydrochloric acid. As the reaction proceeds, the rate of sulfur precipitation decreases.
Explain, in terms of collision theory and particles, why the rate of this reaction decreases as the reactants are consumed.
127 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.