Reactants are what you start with, and products are what you end up with.
Sun is a star, not reactant or product.
reactant
The reactant, because it is reacting to form the product of H2O.
The product is what is produced at the end of a chemical reaction. Example | H2 (Reactant) + O (Reactant) -----> H2O (Product)
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reactant + reactant = product
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
the limiting reactant is how much of a compound or solution you need to make an experiment possible. the excess reactant is the amount left over from the other compound or solution used (the other reactant that is used)