How are the concentration of the reactants and reaction rate related?
a. increasing concentration decreases all reaction rates the same.
b. the concentration of reactants is a result of the reaction rate.
c. a change in concentration results in a change in the rate of a
reaction
d. increasing concentration increases all reaction rates the same,

C. A change in concentration results in a change in the rate of a

reaction

Explanation:

We first need to know what is the rate of a reaction;

The rate of a reaction refers to the speed at which reactants are converted to products.

Secondly we need to identify several factors that affect the rate of reactions.

The rate of reactions depends on a number of factors which include, surface area of reactants, concentration of both reactants and products, temperature, presence of a catalyst, etc.

Thirdly, understand the effect of concentration of reactants and products on the rate of reaction.

If we consider the concentration of reactants and products;An increase in the concentration of reactants increases the number of collisions which results to an increase in the rate of reaction.On the other hand, when the concentration of products is increased, the rate of reverse reactions increases for reversible reactions while a decrease in the concentration of reactants favors forward reaction.

Therefore, in our case, we can say that, a change in the concentration of either reactants or products results in a change in the rate of a reaction.