In the chemical equation 2H₂ + O₂ → 2H₂O, what does the small number ₂ in H₂ represent?, coefficient, subscript, In the equation 2H₂ + O₂ → 2H₂O, what does the number 2 before H₂ represent?, coefficient, subscript, What do we call the substances present before the arrow (→) in a chemical equation?, products, reactants, What do we call the substances formed after the arrow (→) in a chemical equation?, products, reactants, What principle explains why the total mass of the reactants is equal to the total mass of the products?, Law of Definite Proportion, Law of Conservation of Mass

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