Answer: 10 min.
- A 10 min
- B 3 min
- C 15 min
- D 6.93 min
Correct answer: A. 10 min
Explanation: t = (2.303/k) × log([A]₀/[A]) = (2.303/0.231) × log(100/10) = 9.97 × 1 ≈ 10 min.
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.