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Class 11ChemistrySome Basic Concepts of ChemistryLaws of chemical combinationEasy
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Which statement uses conservation of mass correctly?

Answer and explanation

Correct answer: In a closed system, the total mass of reactants and products is equal.

According to the law of conservation of mass, the total mass in a closed system remains the same before and after a chemical reaction. Hence, the total mass of reactants equals the total mass of products. In an open system, measured mass may appear lower if a gas escapes, but mass is still conserved when the escaped gas is included. Exam tip: look carefully for the terms “total mass” and “closed system.”

Related tags

Conservation Of MassChemical CombinationClosed SystemReactants And ProductsClass 11 ChemistryLaws 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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