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During an unknown process in a closed container, the properties of a substance changed, a new substance was formed, and the total mass remained unchanged. What is the most appropriate conclusion?

Answer and explanation

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

Formation of a new substance and a change in chemical properties identify a chemical reaction rather than a merely physical change. Because the container is closed, no reactant or product can escape, so the total mass before and after the reaction remains equal. This demonstrates conservation of mass. Option A combines both conclusions; option B ignores the new substance, while C and D contradict the evidence.

Related tags

ScienceClass10Chemical-ReactionsChemical-ChangeConservation-Of-MassChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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