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Questions and Answers

A mixture is a chemical combining of substances.

False

In a compound, the ______ are chemically combined so that the elements that make up the compound ______ their identities and ______ take on a new set of properties.

  • molecules, lose, do not
  • molecules, retain, do
  • atoms, lose, do not (correct)
  • atoms, retain, do (correct)

    • The smallest identifiable unit of a compound is a(n) _____ which is made up of _____ which are chemically bonded.

    molecule, atoms

    A mixture is always made up of a combination of elements.

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

    In a mixture, the substances ______ their identities.

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

    In a mixture, the substances involved ______ be separated by a simple physical process because the elements are ______.

    <p>cannot, chemically bonded</p> Signup and view all the answers

    An element can be broken down into a simpler substance.

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

    The smallest identifiable unit of an element is a(n) _____

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

    From the following list of substances, which ones are elements?: silver, water, oxygen, air, carbon dioxide, hydrogen, gold, sulfur, wood alcohol, carbon, sugar, magnesium, chromium, nitrogen, salt, nickel

    <p>silver, oxygen, hydrogen, gold, sulfur, carbon, magnesium, chromium, nitrogen, nickel</p> Signup and view all the answers

    Explain how to separate the sugar and water in a solution of sugar and water.

    <p>Dissolve the sugar by stirring it in water. Then let it sit until the water evaporates.</p> Signup and view all the answers

    How would you separate a mixture of alcohol and water?

    <p>Heat it. Alcohol vaporizes at 78 degrees Celsius before water so the water will be left.</p> Signup and view all the answers

    How would you separate sand and water?

    <p>Filter out the water.</p> Signup and view all the answers

    Is air classified as a pure substance or a mixture?

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

    Is water classified as a pure substance or a mixture?

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

    Is mercury classified as a pure substance or a mixture?

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

    Is gasoline classified as a pure substance or a mixture?

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

    Is sugar classified as a pure substance or a mixture?

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

    Is oxygen classified as a pure substance or a mixture?

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

    Is grain alcohol classified as a pure substance or a mixture?

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

    Is salt water classified as a pure substance or a mixture?

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

    Is a sand and salt mixture classified as heterogeneous or homogeneous?

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

    Is salt water classified as a heterogeneous or homogeneous?

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

    Is pure water classified as a heterogeneous or homogeneous?

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

    Is tossed salad classified as a heterogeneous or homogeneous?

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

    Is hydrogen classified as a heterogeneous or homogeneous?

    <p>neither</p> Signup and view all the answers

    Is air classified as a heterogeneous or homogeneous?

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

    Is an apple classified as a heterogeneous or homogeneous?

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

    Is granite classified as a heterogeneous or homogeneous?

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

    Is iron classified as a heterogeneous or homogeneous?

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

    Is iron with rust classified as a heterogeneous or homogeneous?

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

    Is nitric acid classified as a heterogeneous or homogeneous?

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

    Is wood classified as a heterogeneous or homogeneous?

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

    Is freshly-brewed black coffee classified as a heterogeneous or homogeneous?

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

    Is water classified as a heterogeneous or homogeneous?

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

    Is Lucky Charms classified as a heterogeneous or homogeneous?

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

    Is salt classified as a heterogeneous or homogeneous?

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

    Is dirt classified as a heterogeneous or homogeneous?

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

    Study Notes

    Mixtures and Compounds

    • A mixture is not a chemical combining of substances; components retain their individual identities.
    • In compounds, atoms are chemically combined, causing them to lose their original identities and acquire new properties.
    • The smallest unit of a compound is a molecule, which consists of chemically bonded atoms.

    Elements and Mixtures

    • A mixture can include substances other than just elements; it is false that a mixture is always made up of elements.
    • Elements cannot be broken down into simpler substances.
    • The smallest identifiable unit of an element is an atom.

    Identification of Elements

    • Elements from a specified list include: silver, oxygen, hydrogen, gold, sulfur, carbon, magnesium, chromium, nitrogen, nickel. Other substances on the list are compounds or mixtures.

    Separation Techniques

    • Sugar can be separated from water by dissolving it, stirring, and then allowing the water to evaporate.
    • Alcohol can be separated from water by heating, as it vaporizes before water at 78°C.
    • Sand can be separated from water through filtration.

    Classification of Substances

    • Air is classified as a mixture, while water, mercury, oxygen, sugar, and grain alcohol are considered pure substances.
    • Gasoline and salt water are deemed mixtures.

    Heterogeneous and Homogeneous Mixtures

    • A sand and salt mixture is classified as heterogeneous, while salt water is homogeneous.
    • Pure water is homogeneous, as are nitric acid and freshly brewed black coffee.
    • Tossed salad, an apple, granite, and dirt are classified as heterogeneous mixtures.
    • Iron is homogeneous, but iron with rust is heterogeneous.

    General Properties

    • Sugar, salt, and pure water are homogeneous substances.
    • Heterogeneous mixtures vary in composition and appearance, exemplified by items like Lucky Charms, sausage-and-mushroom pizza, and wood.

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    Description

    This quiz focuses on the fundamental concepts of matter, including mixtures and compounds. It will test your understanding of how substances combine and the properties of these combinations. Perfect for students studying chemistry at any level.

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