Answer: -k/2.303.
- A -k/2.303
- B -k
- C +k/2.303
- D -2.303 k
Correct answer: A. -k/2.303
Explanation: The integrated first-order equation gives log[A] = log[A]<sub>0</sub> - (k/2.303)t, so the slope of log[A] versus t is -k/2.303.
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.