Compound : pure substance made up of two or more different
elements chemically bonded together. They are hard
to separate. ( exs – salt, water and iron sulfide )
Chemical Formula: a representation of a molecule consisting of
chemical symbols, subscripts and coefficients.
( ex CO2 , N2 , 2NaSO3 )
Chemical Reaction: Is a process in which one substance or set of
substances, known as reactants are changed
into another substance or set of substances known as products.
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