Answer: lower activation energy.
- A higher activation energy
- B lower activation energy
- C higher temperature
- D greater concentration
Correct answer: B. lower activation energy
Explanation: A catalyst offers an alternative route with a lower activation energy, so more molecules can react.
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.