Answer: 10 min.
- A 5 min
- B 10 min
- C 20 min
- D 100 min
Correct answer: B. 10 min
Explanation: t½ = 0.693/k = 0.693/0.0693 = 10 minutes.
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.