Chemistry · May / June 2021 · Paper 11 · Question 18

Which changes will speed up a chemical reaction? 1 decreasing the pressure in a reaction between gases 2 increasing the size of the solid particles in a reaction involving solids 3 increasing the temperature of any reaction 4 increasing the concentration of a solution

1. A1 and 3
2. B2, 3 and 4
3. C3 and 4 only
4. D4 only

As printed in the paper