# Is hydrogen and oxygen gas combining to form H_2O a chemical or physical change?

Apr 14, 2017

This is manifestly a chemical change............

#### Explanation:

Chemical change is characterized by the making and breaking of strong chemical bonds, and the formation of new substances.......

${H}_{2} + \frac{1}{2} {O}_{2} \rightarrow {H}_{2} O$

And this representation certainly depicts the breaking STRONG $H - H$ and $O = O$ bonds, and the making of stronger $H - O$ bonds in the water molecule.

And so, this clearly is an example of chemical change.