Chemistry Class Quiz: Elements, Compounds, Mixtures
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Questions and Answers

What is an element?

  • A pure substance containing only one kind of atom (correct)
  • A mixture of different substances
  • A compound with multiple atoms
  • None of the above

    • What defines a compound?

  • Contains two or more kinds of atoms combined chemically (correct)
  • A mixture that can be separated by physical means
  • Made up of only one kind of atom
  • Only contains gases

    • Which of the following is a mixture?

  • Air (correct)
  • Sugar (C6H12O6)
  • Water (H2O)
  • Diamond (C)

    • What is the definition of a mixture?

    <p>A substance containing two or more elements or compounds that are not chemically combined.</p> Signup and view all the answers

    What is the formula for water?

    <p>H2O</p> Signup and view all the answers

    ______ is a compound with the formula NH3.

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

    Match the following substances to their type:

    <p>Diamond (C) = Element Air = Mixture Sodium chloride (NaCl) = Compound Gold (Au) = Element</p> Signup and view all the answers

    A compound can be separated by physical means.

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

    Krypton (K) is an element.

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

    Which of the following is a compound?

    <p>Salt (NaCl)</p> Signup and view all the answers

    Which of the following are classified as mixtures?

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

    Study Notes

    Elements

    • Pure substances containing only one kind of atom.
    • Always homogeneous and cannot be separated into simpler materials except during nuclear reactions.
    • Over 109 elements are classified on the periodic table.
    • Examples include Diamond (C), Krypton (K), Bismuth (Bi), Uranium (U), Iron (Fe), Gold (Au), and Titanium (Ti).

    Compounds

    • Pure substances made of two or more kinds of atoms that are chemically combined.
    • Always homogeneous and cannot be separated by physical means; requires a chemical reaction for separation.
    • Properties of compounds differ from the properties of the individual elements they contain.
    • Examples include Water (H2O), Ammonia (NH3), Dry Ice (CO2), Sugar (C6H12O6), Sulfuric Acid (H2SO4), Baking Soda (NaHCO3), and Alcohol (CH3OH).

    Mixtures

    • Composed of two or more elements or compounds that are not chemically combined, with no reaction occurring between substances.
    • Can be homogeneous (solutions) or heterogeneous (non-uniform).
    • Mixtures can be separated into components through physical or chemical means.
    • Properties of mixtures reflect the properties of their components.
    • Examples include Air, Wood, Bronze, Milk, Gasoline, Pails of Garbage, Ink, Popcorn, Dogs, Pizza, and Concrete.

    Non-Classified

    • Energy and Electricity do not fall into the categories of elements, compounds, or mixtures.

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    Description

    Test your knowledge on the fundamental concepts of elements, compounds, and mixtures. This quiz covers definitions, examples, and characteristics of these essential chemical categories. See how well you understand the building blocks of chemistry!

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