define reactants,product and a chemical reaction.

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Solution

A substance participating in a chemical reaction, present at the beginning of a chemical reaction or molecules before it undergoes a chemical change is called a reactant.
A chemical substance formed as a result of a chemical reaction is called a product.
A chemical reaction is a process that leads to the transformation of one set of chemical substances to other new substances.
The chemical reaction H2(g) + ½ O2(g) â†’ H2O(l) describes the formation of water from its elements.
H2(g) + ½ O2(g) â†’ H2O(l)
Reactants Product

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