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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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A student performed a reaction in an open beaker and found lower mass because gas escaped. What is the correct conclusion?

Answer and explanation

Correct answer: The experiment should have been done in a closed system

According to the law of conservation of mass, total mass remains constant in a chemical reaction. In the open beaker, the gas produced escaped, so the measured mass of the beaker and remaining contents appeared lower. Gases do have mass; if the escaped gas were included, the total mass would remain the same. Therefore, the experiment should have been performed in a closed system. Exam tip: mention a closed container when testing conservation of mass in a gas-producing reaction.

Related tags

Conservation Of MassChemical ReactionsClosed SystemOpen BeakerGaseous ProductsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistry
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10 more MCQs
  1. 1Who is commonly credited with formulating the law of conservation of mass?
  2. 2Which statement correctly describes the law of conservation of mass for a chemical reaction in a closed system?
  3. 3In which type of system can the total mass of a reacting sample be measured as remaining constant without accounting for matter exchanged with the surroundings?
  4. 4Who proposed the law of definite proportions, also known as the law of constant composition?
  5. 5What does the law of definite proportions state about a pure compound?
  6. 6In a pure sample of water, what happens to the mass ratio of hydrogen to oxygen?
  7. 7The law of multiple proportions is associated with which scientist?
  8. 8When does the law of multiple proportions apply?
  9. 9According to the law of multiple proportions, what is the ratio of the masses of one element that combine with a fixed mass of another element in different compounds?
  10. 10Who proposed the law of reciprocal proportions?
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