Chemistry Regents Practice Test 2025 - Free Chemistry Regents Practice Questions and Study Guide

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What does the law of conservation of mass state?

Mass can be created during a reaction

Mass is not created or destroyed in a chemical reaction

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. This fundamental principle means that the total mass of the reactants (the substances that undergo the reaction) will always equal the total mass of the products (the substances formed as a result of the reaction). This law is crucial in chemistry because it allows scientists to predict the outcomes of reactions and to balance chemical equations.

For example, if you start with 10 grams of reactants in a closed system, after the reaction, the total mass of the products will also be 10 grams, regardless of the changes that occur during the process. This principle underpins stoichiometry, which involves calculating the amounts of reactants and products in a chemical reaction, ensuring that mass is conserved throughout.

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Mass can only be destroyed

Mass changes state in a chemical reaction

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