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In the law of conservation of mass what are reactants?

Answer and explanation

Correct answer: Substances that start the reaction

The direct answer is A: reactants are the substances that are present at the beginning and take part in a chemical reaction. In a chemical equation, reactants are written on the left side, and products are written on the right side. During the reaction, atoms are rearranged: the reactants change into new substances called products. The law of conservation of mass says that atoms are not created or destroyed in the reaction, so the total mass of reactants equals the total mass of products in a closed system. A is correct because it identifies the starting substances. B is wrong because substances formed after the reaction are products, not reactants. C is wrong because reactants may be solids, liquids, gases or solutions; they are not only gases. D is wrong because colour is a property or observation, not a substance. A useful example is hydrogen and oxygen reacting to form water: hydrogen and oxygen are reactants, while water is the product. Memory cue: reactants react first; products are produced afterward.

Related tags

Chemistry Laws Chemical CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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