Pure Substances Quiz
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Questions and Answers

How are pure substances defined?

  • Materials with varying kinds of particles
  • Materials made up of the same kind of particles (correct)
  • Materials with unique properties
  • Materials with no chemical properties
  • Why are different elements/compounds classified together?

  • Due to their physical state
  • Due to their different properties
  • Due to their similar properties (correct)
  • Due to their atomic weight
  • How many elements are currently known?

  • 118 (correct)
  • 92
  • 150
  • 63
  • What is the basis for the classification of elements into metals and nonmetals?

    <p>Differences in physical and chemical properties</p> Signup and view all the answers

    Why are elements grouped together for classification?

    <p>To study their general characteristics</p> Signup and view all the answers

    Which metal is the most abundant in the earth's crust?

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

    In what form are highly reactive metals like sodium and potassium found in nature?

    <p>Elemental form</p> Signup and view all the answers

    Which non-metal is found in its free state in the atmosphere?

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

    In what state does carbon exist as diamond and graphite?

    <p>Elemental state</p> Signup and view all the answers

    Which metal is an example of a less reactive metal found in nature in its elemental state?

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

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