Respiration is the chemical process by which energy is released from organic compounds (food) by living cells.

A salt is a substance formed when metal ions or the ammonium ion take the place of the hydrogen ion(s) of an acid.

A base is a proton acceptor. As was discussed in this previous post on acids, a proton is an H⁺ ion. Many bases are metal oxides/hydroxides

hese 'functions' are ways of communication in certain contexts (in which you will be expected to respond correspondingly).

The limiting reagent is the reactant which produces the smallest yield of products. In the first case, oxygen is the limiting reagent...