The specific rate constant of a first order reaction depends on the________________?
Correct answer: C. Temperature
- A. Time
- B. Concentration of the reactant
- C. Temperature
- D. Concentration of the product
Explanation
For a given reaction, the first-order rate constant remains independent of reactant concentration and changes mainly with temperature according to the Arrhenius relationship. Changing concentration changes the rate, but not the value of k at the same temperature. Students often choose b because concentration appears in the rate equation, but that equation contains both k and concentration as separate factors.
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About Rate Constant
The rate constant, k, connects reaction rate with reactant concentrations in a rate law and has a value fixed for a particular reaction at a given temperature. Questions involve determining k from rate data, identifying its units for different reaction orders, and applying the Arrhenius equation to temperature changes.
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