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In general, the substances on the left-hand side of the equation are called the reactants, while the substances on the right-hand side are called the products. In the reaction 2 H2 + O2 ----> 2 H2O, the

reactant(s) is/are {1}_________________. The product(s) is/are {2}___________________.

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Final answer:

In the reaction 2 H2 + O2 ----> 2 H2O, hydrogen (H2) and oxygen (O2) are the reactants, and water (H2O) is the product.

Step-by-step explanation:

In the chemical reaction 2 H2 + O2 ----> 2 H2O, the reactant(s) are hydrogen (H2) and oxygen (O2). The reactants are substances that exist before the chemical reaction takes place and are typically listed on the left-hand side of the equation. In this case, the 2 H2 represents two molecules of hydrogen, and the O2 represents one molecule of oxygen.

The product(s) of this reaction is water (H2O), which is formed as a result of the chemical reaction between the reactants. The products are the new substances formed and are listed on the right-hand side of the chemical equation. In this particular equation, the presence of the coefficient 2 before H2O indicates that there are two molecules of water produced.

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