A catalyst affects the rate of a chemical reaction by :

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decreasing the energy difference between the reactants and products.

providing an alternate reaction pathway with a lower activation energy.

increasing the number of collisions between the reactants.

increasing the average kinetic energy of the reactants.

answer is D.

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Detailed Solution

A catalyst affects the rate of a chemical reaction by providing an alternate reaction pathway with a lower activation energy.

The catalyst do not take part in the chemical reaction but change the rate of reaction. They do this by lowering the activation energy with other path. When the activation energy is lower, then more reactants will cross the barrier.

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