Meanings

hydrogen bromide (HBr)

nitrogen cycle

hydrogenation

alkene

hydrogen iodide

nitrogen oxide (esp. nitric oxide, but also nitrous oxide, nitrogen dioxide, dinitrogen pentoxide, etc.)

oxygen tent

synthetic element

tritium

carbon tetrachloride (CCl4)

oxyacetylene flame

reactive oxygen (i.e. free radicals, which can be destructive at high concentrations)

platinum group metals

arsenic trioxide

hydrogen fluoride

nitrogen group (group 15 of the periodic table)

nitrogen group (group 15 of the periodic table)

silicon nitride

alkane

aptitude for music