# Breaking bonds such as those in Hydrogen peroxide gives off energy What was some proof that energy was released during this experiment?

Jun 21, 2017

You have not specified the experiment.......

#### Explanation:

And in addition, BREAKING BONDS requires energy. Whereas making bonds releases energy.

We know that hydrogen peroxide decomposes according to the equation......

${H}_{2} {O}_{2} \left(l\right) \stackrel{M n {O}_{2}}{\rightarrow} {H}_{2} O \left(l\right) + \frac{1}{2} {O}_{2} \left(g\right) \uparrow + \Delta$

And that's the experimental result.......i.e. evolution of heat. While it does require energy to break the the $H - O$ and (less $\Delta$) $O - O$ bonds, heat is released upon formation of strong $H - O$ and $O = O$ bonds. The balance of enthalpy change is negative, and the reaction gives an exotherm.

Often a little $M {n}^{I V +}$ salt is added to catalyze this reaction.

And please note that scientists do not deal in $\text{proof}$, they deal in $\text{evidence}$; and the evidence of such heat transfer is a rise in temperature of the reaction solvent.