Explain why most collisions do not lead to reaction.

In the subtopic Collision theory, this AQA A-Level Chemistry 7405 learning objective focuses on explain why most collisions do not lead to reaction. It belongs to Kinetics, so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include most, collisions, lead, reaction. Collision frequency. means the number of collisions that occur per unit time between reacting particles Avoid the mistake of students often state that most collisions do not lead to a reaction without explaining why; instead, to correct this, students should explain that the cause is insufficient energy in most collisions. The mechanism is that only collisions with energy equal to or greater than the activation energy can overcome the energy barrier for reaction. The effect is that these collisions do not result in a reaction, leading to the consequence that reaction rates remain low For exam answers, focus on how activation energy influences reaction outcomes