Addition or presence of a catalyst
Size of the reacting particles
The enthalpy change for the reaction
Concentration of the reactants
Temperatureat which the reaction is carried out
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The correct answer is:
C. The enthalpy change for the reaction
Explanation:
The enthalpy change (ΔH) of a reaction represents the overall heat absorbed or released but does not directly influence the rate at which a reaction occurs. The factors that do affect the rate of reaction include:
A. Addition or presence of a catalyst → Catalysts speed up reactions by providing an alternative pathway with lower activation energy.
B. Size of the reacting particles → Smaller particles have a larger surface area, leading to more frequent collisions and a faster reaction rate.
D. Concentration of the reactants → Higher concentration means more particles are available to collide, increasing the reaction rate.
E. Temperature at which the reaction is carried out → Higher temperatures increase the kinetic energy of particles, leading to more frequent and energetic collisions, thus speeding up the reaction.
Since enthalpy change describes only the energy difference between reactants and products but does not affect collision frequency or energy, it does not influence the reaction rate.
