Answer: Adding a catalyst.
- A Temperature
- B Concentration of reactants
- C Pressure for gas reactions
- D Adding a catalyst
Correct answer: D. Adding a catalyst
Explanation: A catalyst does not change K since it speeds up both forward and reverse reactions equally.
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.