Chemistry Class Concepts Quiz
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Questions and Answers

What type of change is described by evaporating alcohol?

  • Biological change
  • Environmental change
  • Chemical change
  • Physical change (correct)

    • Which of the following substances is classified as a pure element?

  • Water ($H_2O$)
  • Formaldehyde ($CH_2O$)
  • Air
  • Helium (He) (correct)

    • What type of change occurs when gasoline is burned?

  • Thermal change
  • Mechanical change
  • Chemical change (correct)
  • Physical change

    • Which of the following best describes distilled water?

    <p>A pure substance and a compound</p> Signup and view all the answers

    What classification applies to the air in the room?

    <p>Mixture and both element and compound</p> Signup and view all the answers

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