Answer: Activation energy.
- A Threshold energy
- B Activation energy
- C Bond energy
- D Gibbs energy
Correct answer: B. Activation energy
Explanation: Activation energy (Ea) is the minimum energy needed to reach the transition state.
First-order decay curve: concentration halves every t½, and that half-life is constant - a defining test for first-order kinetics.
Concept context
Study the speed of reactions and what affects it: concentration, temperature, and catalysts. Covers rate law, order of reaction, the Arrhenius equation, and reaction mechanisms step by step.