Pure Substance in Chemistry
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Questions and Answers

Which of the following is considered a pure substance?

  • Gold containing only gold elements (correct)
  • Water with added minerals
  • Baking soda with impurities
  • Table salt mixed with other substances
  • What is the melting point characteristic of pure substances?

  • Multiple melting points
  • Melts at different temperatures
  • Sharp, single melting point (correct)
  • No distinct melting point
  • Which substance is NOT a pure substance?

  • Diamonds found deep within earth's surface
  • Copper with high conductivity
  • Oxygen gas made up of two oxygen atoms
  • Water found in nature with minerals (correct)
  • What is the ability of a pure substance to transfer electricity known as?

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

    In chemistry, substances can be described by their physical and chemical properties. Which is NOT a physical property of pure substances?

    <p>Ability to react with other substances</p> Signup and view all the answers

    What is a pure substance in chemistry?

    <p>A substance with a fixed structure and definite properties</p> Signup and view all the answers

    What is the concept of purity for a substance to be considered pure?

    <p>Purity of 100%</p> Signup and view all the answers

    How are impurities removed from liquid substances during refining?

    <p>By using distillation or fractionation</p> Signup and view all the answers

    What is the reality regarding the purity rating of most pure substances in our lives?

    <p>99%</p> Signup and view all the answers

    What process helps remove impurities from solid substances during refining?

    <p>Putting them in a solution to grow crystals</p> Signup and view all the answers

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