Answer: catalyst.
- A reactant
- B catalyst
- C product
- D solvent
Correct answer: B. catalyst
Explanation: A catalyst provides a lower-energy pathway and is regenerated, so it is not consumed overall.
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.