Answer: Slope of the tangent at that instant.
- A Area under the curve
- B Slope of the tangent at that instant
- C Total change in concentration
- D Intercept on the time axis
Correct answer: B. Slope of the tangent at that instant
Explanation: The instantaneous rate equals the slope of the tangent drawn to the concentration-time curve at that particular moment.
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.