A student makes four statements about collision theory.
Statement 1: increasing the temperature increases the rate only because the particles collide more often
Statement 2: doubling the concentration of an acid doubles the number of acid particles in the same volume, so collisions happen more often
Statement 3: increasing the pressure of a gas reaction increases the proportion of collisions that have at least the activation energy
Statement 4: using a powder instead of lumps increases the rate because more reactant particles are exposed and can collide
Which statements are correct?
2 only
2 and 4 only
1, 2 and 4 only
2, 3 and 4 only
54 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.