Hydrogen Peroxide.

Hydrogen peroxide is similar in composition to water (H2O) with an additional oxygen molecule (H2O2). The usual form is liquid, though small amounts of gas can sometimes be found in the air. It is the simplest of all the peroxides and breaks down into water and oxygen upon heating as well as in the presence of salts from several metals (copper, chromium, iron, manganese, or nickel). When mixed with some compounds, most notably sodium perborate (NaBO2·H2O2·3H2O or NaBO3·4H2O), it creates mild oxidizing crystalline solids, a common component in laundry detergents and chlorine-free bleaches. Hydrogen peroxide storage containers can explode if exposed to heat or fire.