dioksid-e karbon, gâz karbonik (#)
Fr.: dioxyde de carbone
CO2, also called carbonic acid gas. A colorless gas which occurs in
the atmosphere playing an essential part in animal respiration and the
growth of green plants. → photosynthesis,
→ carbon cycle. It is formed by the
→ oxidation of carbon and carbon compounds. Carbon dioxide is the most
important → greenhouse gas produced by human activities, primarily
through the combustion of fossil fuels. Its concentration in the
Earth's atmosphere has risen by more than 30% since the Industrial
Revolution. CO2 forms a solid at -78.5 °C at atmospheric pressure, and
is used as a refrigerant in this form as a dry ice for the
preservation of frozen foods. As carbon dioxide gas is heavier than
air and does not support combustion, it is used in fire
carbon monoxide (CO)
monoksid-e karbon (#)
Fr.: monoxyde de carbone
A colorless, odorless, very poisonous gas which burns in air with a
bright blue flame to form → carbon dioxide.
CO gives rise to a violent explosion when ignited in air in certain proportions. It
occurs in coal gas and in the exhaust fumes of motor engines. Melting point -207 °C;
boiling point -191.1 °C.
A diatomic ion containing one oxygen and one hydrogen atom with chemical formula OH-.
titanium oxide, TiO
Fr.: oxide de titane
Fr.: dioxyde d'uranium
A black crystalline solid (UO2pitchblende, carnotite, and autunite and is used chiefly as a source of nuclear energy by fission of the radioisotope uranium-235. After the → uranium hexafluoride is enriched, a fuel fabricator converts it into uranium dioxide powder and presses the powder into fuel pellets.
Fr.: oxyde d'uranium
A chemical compound made up of → uranium and → oxygen. The most common forms of uranium oxide are U3O8 and UO2. Both oxide forms are solids that have low solubility in water and are relatively stable over a wide range of environmental conditions. Triuranium octaoxide (U3O8) is the most stable form of uranium and is the form most commonly found in nature. → Uranium dioxide (UO2) is the form in which uranium is most commonly used as a → nuclear reactor fuel. At ambient temperatures, UO2 will gradually convert to U3O8.
zirconium oxide, ZrO
Fr.: oxide de zirconium