In the equation 2 H2 + O2 → 2 H2O, the H2 molecules are and the H2O molecules are .

H2 molecules are reactants and H2O molecules are products.

Explanation:

The molecules that react to form a compound or any product is called reactants and the thing we get after the chemical reaction is product. Another definition is that the molecules or compounds that are present on the left side of the chemical equation is reactants and the molecules or compounds on the right side are products.

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