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After a reaction in an open container, the measured mass appears lower because a gas produced has escaped. What is the correct scientific explanation?

Answer and explanation

Correct answer: The mass of the escaped gas was no longer included in the system being measured

The law of conservation of mass applies when the complete system is considered. In an open container, a gaseous product can leave before weighing, so the measured system contains less material and its apparent mass decreases. The gas has not been destroyed; it is simply outside the chosen system boundary. The reaction may still be chemical and has produced a product. Hence option B is correct.

Related tags

ScienceClass10Conservation Of MassChemical ReactionsOpen SystemChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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