(i) elements
(ii) compounds
(iii) reactants
(iv) products
(v) metals
(vi) non-metals
H2 + CuO Cu + H20
(i) H2 and Cu are elements in the reaction.
(ii) The compounds are CuO and H20
(iii) The reactants are H2 and CuO
(iv) The Products are Cu and H20
(v) Metal involved in reaction Cu
(vi) The Non-metal involved in reaction H2.