Chemistry Regents Practice Test 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 400

What principle is described by the law of conservation of mass?

Energy cannot be created or destroyed

Mass is created during chemical reactions

Mass is neither created nor destroyed in a chemical reaction

The law of conservation of mass states that in a closed system, the total mass remains constant over time, regardless of the processes acting inside the system. This principle indicates that during a chemical reaction, the mass of the reactants is equal to the mass of the products. In other words, atoms are rearranged to form new substances, but no atoms are lost or gained in the process. This means that mass is conserved; it is neither created nor destroyed.

Understanding this concept is fundamental in chemistry as it helps explain how substances change during reactions while maintaining the same total mass, which is essential for balancing chemical equations and understanding stoichiometry.

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Mass changes during physical transformations

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