Answer: Its molecularity.
- A Its half-life value
- B The number of products
- C Twice the molecularity
- D Its molecularity
Correct answer: D. Its molecularity
Explanation: For an elementary (single-step) reaction, the experimentally observed order equals the molecularity, i.e. the number of species colliding in that step.
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.