The value of the rate constant k for a given reaction changes when
Correct answer: C. the temperature is changed
- A. the concentration of the reactants is increased
- B. the volume of the vessel is changed
- C. the temperature is changed
- D. more product is removed
Explanation
The rate constant is constant only at a fixed temperature; the Arrhenius equation shows it rising sharply as temperature increases or as activation energy falls, which is also why a catalyst increases k. Changing concentration changes the rate but leaves k untouched, since the concentration term is already written separately in the rate equation. This distinction between rate and rate constant is examined frequently.
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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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