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When a hydrocarbon molecule and an oxygen molecule react chemically, energy breaks molecular bonds of the reactants and forms the new molecular bonds of the products. How is energy involved in bonds forming and breaking during the reaction?

Choose one.

A. Energy is released as bonds form and is released as bonds break.


B. Energy is released as bonds form and is absorbed as bonds break.


C. Energy is absorbed as bonds form and is released as bonds break.


D. Energy is absorbed as bonds form and is absorbed as bonds break.

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Answer:

C. Energy is absorbed as bonds form and is released as bonds break.

Explanation:

In chemistry, when a bond is broken energy is released, while and bond formation is a process that requires energy -meaning energy is absorbed-.

It is for this reason that reactions of the type A + B → C are endothermical, while reactions of the type C → A + B are exothermical.

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