Question

When is energy released during a chemical reaction?

when chemical bonds break and form

when chemical bonds form

when chemical bonds break

Answer 1

The answer is B. energy is only realesed when chemical bonds form.

Answer 2

The correct option ls B.
During chemical reactions, energy is needed to break the chemical bonds which hold the molecules of the reactants together so that new bonds that yield products can be made. When new products are made in a chemical reaction, energy is always released. Thus energy is needed to break existing bonds and energy is released when new bonds are formed.