Ozone forms

Properties of starting substances

- Ozone forms when oxygen molecules (O2) are broken apart and recombine as three oxygen atoms (O3).

- The process of ozone formation typically occurs in the upper atmosphere, where sunlight breaks apart oxygen molecules.
- Ozone has a pungent odor and is blue in color in its pure form.
- Ozone is a highly reactive molecule and is a powerful oxidizing agent.
- Ozone has a higher density than oxygen gas, which allows it to accumulate in the stratosphere where it forms the ozone layer.