Answer: [A₀]/2k.
- A [A₀]/2k
- B 0.693/k
- C 2k/[A₀]
- D k/[A₀]
Correct answer: A. [A₀]/2k
Explanation: For a zero-order reaction t½ = [A₀]/2k, so it is directly proportional to the initial concentration.
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.