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In a closed system, the total mass before and after a reaction remains the same, but the properties of the substances change. What is the correct conclusion?

Answer and explanation

Correct answer: New substances have formed, and the law of conservation of mass applies.

A change in the properties of substances indicates that new substances have formed, so a chemical reaction has occurred. In a closed system, equal total mass before and after the reaction demonstrates the law of conservation of mass. Option B is incorrect because no reaction, or merely a change of position, would not produce substances with new properties.

Related tags

Chemical ReactionsConservation Of MassClosed SystemClass 10 ScienceChemical Change

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