None of both: it is a mixture, not reactive at all: look at the sea!
Sugar can be both a reactant and a product.
Sun is a star, not reactant or product.
reactant
This depends on the reaction involved.
sulfur is a reactant
Reactant
reactant
The reactant, because it is reacting to form the product of H2O.
Oxygen is a reactant
product
Reactant- glucose and product- carbon dioxide.
The product is what is produced at the end of a chemical reaction. Example | H2 (Reactant) + O (Reactant) -----> H2O (Product)