Chemistry Class 10: Matter, Elements, and Compounds
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Questions and Answers

What is the primary difference between a pure substance and a mixture?

  • The presence of different elements
  • The ability to be separated into components
  • The uniform composition throughout (correct)
  • The presence of metalloids

    • Which of the following elements is most abundant in the Earth's atmosphere?

  • Helium (He)
  • Oxygen (O2)
  • Nitrogen (N2) (correct)
  • Argon (Ar)

    • What is the characteristic that distinguishes a metal from a non-metal?

  • The presence of electrons in the outermost energy level
  • The ability to conduct electricity (correct)
  • The ability to form ions
  • The presence of a noble gas configuration

    • Which type of mixture is characterized by a uniform composition throughout?

    <p>Homogeneous mixture</p> Signup and view all the answers

    What is the term for an element that exhibits some properties of metals and some properties of non-metals?

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

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