Laws of Chemical Combination: Conservation of Mass, Definite Proportions, Multiple Proportions
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Questions and Answers

What did Joseph Proust disagree with Claude Berthollet about?

  • The existence of fixed proportions (by mass) of elements in a compound (correct)
  • The distinction between chemical compounds and homogeneous mixtures
  • The use of analytical balance in chemical experiments
  • The role of impurities and experimental errors in composition analysis

    • What did Joseph Proust stress the difference between?

  • Impurities and experimental errors
  • Chemical compounds and homogeneous mixtures (correct)
  • Analytical balance and mass measurements
  • Physical properties and chemical properties

    • In a pure sodium chloride (NaCl) compound, what percentage of chlorine by mass did Joseph Proust find?

  • 25%
  • 45%
  • 80%
  • 60.66% (correct)

    • What did the law of definite proportions provide an excellent example of?

    <p>Scientific progress</p> Signup and view all the answers

    Who proposed the existence of atoms based on the mass relationships findings of Lavoisier and Proust?

    <p>John Dalton</p> Signup and view all the answers

    What did the establishment of more precise measurements after the law of definite proportions uncover?

    <p>Exceptions to the general principle</p> Signup and view all the answers

    Which French chemist was Joseph Proust battling with when his idea began?

    <p>Claude Berthollet</p> Signup and view all the answers

    What did John Dalton postulate the existence of based on mass relationships?

    <p>Atoms of various elements</p> Signup and view all the answers

    What was widely accepted and supported by the measurements of the composition of a large number of compounds?

    <p>The law of definite proportions</p> Signup and view all the answers

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