Chemistry · May / June 2023 · Paper 11 · Question 12

Which statements about the energy changes during a chemical reaction are correct? 1 The activation energy, $E_a$, is the maximum energy the colliding particles must have in order to react. 2 During an endothermic reaction, thermal energy is taken in from the surroundings leading to a decrease in the temperature of the surroundings. 3 The making of chemical bonds is an exothermic process.

1. A1 and 2 only
2. B1 and 3 only
3. C2 and 3 only
4. D1, 2 and 3

As printed in the paper