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In an unknown process, a substance with new properties was formed, and the total mass in a closed container was the same before and after the process. What is the most appropriate conclusion?

Answer and explanation

Correct answer: A chemical reaction occurred, and the law of conservation of mass applied.

The formation of a substance with new properties shows that a new substance was produced; therefore, the process is a chemical reaction. The equality of total mass before and after the reaction in a closed container is consistent with the law of conservation of mass. Options A and D describe physical changes, which do not produce a new substance, while option B contradicts the observation.

Related tags

Class 10 ScienceChemical ReactionsChemical ChangeConservation Of MassClosed ContainerPhysical Change

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