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.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer