The most difficult oxygen riddlesChemistry quiz
What color is singlet oxygen glowing?
Singlet oxygen glows red as it decays from the singlet excited state to the triplet ground state : Singlet oxygen is utilised in organic syntheses, eg. Diels-Alder reaction. Ozone has a bluish colour.
What is St. Elmo's Fire?
form of plasma.
St. Elmo's fire is a form of plasma. The electric field around the object in question causes ionization of the air molecules, producing a faint glow easily visible in low-light conditions. Conditions that can generate St. Elmo's fire are present during thunderstorms, when high voltage differentials are present between clouds and the ground underneath. The nitrogen and oxygen in the Earth's atmosphere cause St. Elmo's fire to fluoresce with blue or violet light; this is similar to the mechanism that causes neon lights to glow
What is elemental oxygen used for?
Oxy-fuel welding was invented in 1903 by French engineers Edmond Fouché and Charles Picard. Pure oxygen, instead of air, is used to increase the flame temperature: a common propane/air flame burns at about 2,000 °C (3,630 °F), a propane/oxygen flame burns at about 2,500 °C (4,530 °F), and an acetylene/oxygen flame burns at about 3,500 °C (6,330 °F).