* Physical properties: A mixture of hydrogen and oxygen is a colorless, odorless, and tasteless gas. It is lighter than air and has a density of 0.0899 g/L at room temperature and pressure.

* Chemical properties: A mixture of hydrogen and oxygen is not a compound, but rather a physical mixture of the two gases. The two gases do not react with each other at room temperature and pressure, but they can react to form water vapor when heated or sparked.

* Uses: A mixture of hydrogen and oxygen is used in a variety of applications, including:

* Fuel for rockets and other spacecraft

* Welding and cutting metals

* Producing glass

* Creating hydrogen peroxide

Compound Oxygen

* Physical properties: Compound oxygen, also known as ozone, is a pale blue, pungent-smelling gas. It is heavier than air and has a density of 2.144 g/L at room temperature and pressure.

* Chemical properties: Compound oxygen is a compound of oxygen that consists of three oxygen atoms bonded together. It is a very reactive gas and can react with a variety of other substances, including metals, organic compounds, and rubber.

* Uses: Compound oxygen is used in a variety of applications, including:

* Bleaching paper and textiles

* Disinfecting water

* Deodorizing air

* Treating medical conditions such as asthma and bronchitis