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In which situation will checking conservation of mass be most reliable?

Answer and explanation

Correct answer: Measuring total mass before and after reaction in a closed container

The law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction, provided the complete system is considered. A closed container prevents gases, vapours, or solids from leaving, so measuring the total mass before and after gives a reliable comparison. In an open vessel, escaping gas makes the remaining material appear lighter. Colour and smell are observations, not measurements of total mass; therefore option A is correct.

Related tags

ScienceClass 10Conservation Of MassChemical ReactionsExperimentChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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