Answer: colour of the flask.
- A reaction temperature
- B presence of a catalyst
- C reactant concentration
- D colour of the flask
Correct answer: D. colour of the flask
Explanation: Temperature, catalyst and concentration affect rate; the colour of the container does not.
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.