The general term is "chemical reaction". There are sub-categories like "oxidation-reduction", "double (and single) replacement", and others.
Reactants.
They are reactants.
a chemist
the name given to chemicals which react together is products
it`s a precipitate
compound
Reactants (can't be any more simple now can it?)
They are reactants.
They are called monomers.
The are called PRODUCTS.
Hydrocarbons
look @ the periodic table :)