(physics, chemistry) The identities, and relative numbers, of the elements that make up any particular compound

the study of the effects of chemical compounds on the interactions of living organisms

(chemistry) any process in which reactants are changed into products by the breaking or creation of chemical bonds

any hazard that results from the accidental, deliberate or potential release of a noxious substance into the environment

any cosmetic preparation designed to remove hair from the skin

(chemistry) the unique combination of analytical results from a number of techniques that identifies a particular compound in a sample

(chemistry) Any mixture of compounds whose relative concentrations oscillate, and in which such change is marked by a visible rhythmic change in colour.

(chemistry) the study of the reaction rates of chemical reactions, especially as a means of elucidating reaction pathways or mechanisms

any laser that obtains its energy from a chemical reaction

(chemistry) any group of elements whose chemical and physical properties have similarities, and that vary progressively through the series; evident within the periodic table