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In an unknown process, a new substance was formed, the colour changed, and the total mass remained the same in a closed container. What is the most appropriate conclusion?

Answer and explanation

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

Formation of a new substance is a key indicator of a chemical reaction. The equality of total mass of reactants and products in a closed container demonstrates the law of conservation of mass. Colour change alone can sometimes occur in a physical change, but the formation of a new substance here confirms a chemical change.

Related tags

ScienceClass-10Chemical-ReactionsConservation-Of-MassClosed-System

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