Which description explains the role of activation energy in a chemical reaction?
a .it provides useful energy that is released in an exothermic reaction.
b. it stops the products from being formed from the intermediate state.
c. it slows down the overall chemical reaction so it does not happen too quickly.
d. it provides reactants with sufficient energy for bonds to break and reform.

The description it provides reactants with sufficient energy for bonds to break and reform best explains the role of activation energy in a chemical reaction.

Explanation:

Activation energy is defined as the minimum amount of required energy so that a chemical reaction can initiate.

As a result, it provides the reactants with certain amount of energy so that they will get the necessary amount of energy to break their bond and then  form new bonds.

Thus, we can conclude that the description it provides reactants with sufficient energy for bonds to break and reform best explains the role of activation energy in a chemical reaction.

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.