Law of Conservation of Mass
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Questions and Answers

What is the main idea behind the Law of Definite Proportions?

  • The ratio of the masses of the elements in a compound varies depending on the source of the original substance.
  • The masses of the constituents of a compound always have the same proportions. (correct)
  • The total mass of matter after a chemical reaction is less than the total mass of matter before the reaction.
  • Matter cannot be created or destroyed, only converted from one form to another.

    • What is the carbon-to-hydrogen mass ratio in isooctane?

  • 5.33:1 (correct)
  • 3:1
  • 5:1
  • 10:1

    • What is the main idea behind the Law of Multiple Proportions?

  • The weights of one element that combine with a fixed weight of another element are integer multiples of one another. (correct)
  • The ratios of the masses of the elements in a compound are always whole numbers.
  • The total mass of matter after a chemical reaction is always equal to the total mass of matter before the reaction.
  • The masses of the elements in a compound always have the same proportions.

    • What is an example of an element that forms multiple oxides?

    <p>Nitrogen</p> Signup and view all the answers

    Who formulated the Law of Definite Proportions?

    <p>Joseph Proust</p> Signup and view all the answers

    What is the fundamental principle behind the law of conservation of matter?

    <p>Matter cannot be created or destroyed, only transformed.</p> Signup and view all the answers

    What is the condition required for the law of conservation of matter to apply?

    <p>The system must be closed to the transfer of matter.</p> Signup and view all the answers

    What is the result of a physical or chemical change according to the law of conservation of matter?

    <p>The total mass of the products remains equal to the total mass of the reactants.</p> Signup and view all the answers

    What is the concept that argues that what exists now has always existed?

    <p>The concept of 'nothing comes from nothing'.</p> Signup and view all the answers

    Who restated the principle of 'nothing comes from nothing' for chemistry?

    <p>Antoine Lavoisier.</p> Signup and view all the answers

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