Which of the following factors does NOT affect the rate of a chemical reaction?
ATemperature of the reactants
BConcentration of the reactants
CEnthalpy change of the reactionCORRECT
DPresence of a catalyst
GCEChemistryEnergetics and Kinetics2023
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Why the answer is C, and why the others tempt you.
The rate of a chemical reaction is influenced by temperature, concentration, surface area, and catalysts — all of which affect the frequency or energy of effective collisions. The enthalpy change (ΔH) is a thermodynamic quantity that indicates energy released or absorbed but does not determine how fast the reaction proceeds.
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