Why does a reaction slow down with time?
O A. The rate constant decreases over time.
B. The reactant concentrations decrease.
C. Molecules stop reacting when they collide.
D. The exponents in the equation change.

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Answer:

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Explanation:

Reaction rate, in chemistry, the speed at which a chemical reaction proceeds. It is often expressed in terms of either the concentration (amount per unit volume) of a product that is formed in a unit of time or the concentration of a reactant that is consumed in a unit of time. Alternatively, it may be defined in terms of the amounts of the reactants consumed or products formed in a unit of time. For example, suppose that the balanced chemical equation for a reaction is of the form

A + 3B → 2Z.

The reactant concentrations decrease.

a p e x