Mixtures and Pure Substances Quiz
24 Questions
100 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

An example of a heterogeneous mixture is:

  • Brass
  • Bronze
  • Water
  • Concrete (correct)
  • Which of the following is an intensive property?

  • Mass
  • Number of molecules
  • Weight
  • Volume
  • Density (correct)
  • Which is NOT a pure substance?

  • Water
  • Brass (correct)
  • Chlorine
  • Copper
  • Which of the following is classified as a mixture?

    <p>Tap water</p> Signup and view all the answers

    Which is NOT a mixture?

    <p>Sodium chloride</p> Signup and view all the answers

    A sugar cube dissolved in water is an example of a ______ change.

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

    Substances produced when atoms chemically combine with each other are called _____

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

    Water is an example of a _____

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

    Which of the following properties of a substance does not change when the amount of the substance changes? What type of property is it?

    <p>Temperature; intensive</p> Signup and view all the answers

    All changes in phase (or state of matter) are:

    <p>Physical changes</p> Signup and view all the answers

    You can easily compress a gas because:

    <p>There is a lot of empty space between its particles</p> Signup and view all the answers

    Solids have a ______ shape, a ______ volume, and ______ be compressed.

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

    Liquids have a ______ shape, a ______ volume, and ______ be compressed.

    <p>indefinite, definite, can</p> Signup and view all the answers

    Gases have a ______ shape, a ______ volume, and ______ be compressed.

    <p>indefinite, indefinite, can</p> Signup and view all the answers

    How is a mixture different from a compound?

    <p>Components of a mixture can be separated by physical means.</p> Signup and view all the answers

    Compounds are:

    <p>Pure substances that are made of more than one element</p> Signup and view all the answers

    Which of the following is an extensive physical property?

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

    One way of telling whether a mixture is a solution or a suspension is by:

    <p>Letting the mixture stand for a while</p> Signup and view all the answers

    An example of a homogeneous mixture is:

    <p>Salt water</p> Signup and view all the answers

    The Tyndall effect is a method used to tell apart _____ and ______.

    <p>colloids; solutions</p> Signup and view all the answers

    Colloids _____ a Tyndall effect.

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

    Solutions _______ a Tyndall effect.

    <p>do not have</p> Signup and view all the answers

    Describe the Tyndall effect.

    <p>The Tyndall effect uses the reflection of light off of particles that are too small to be seen with the naked eye. If one can shine a laser light on a substance (known to be a mixture) and the light shines through it, then the substance has a Tyndall effect and is therefore a colloid. If the light does not shine through then the substance does not have a Tyndall effect and is a solution.</p> Signup and view all the answers

    List the 6 ways to separate matter physically:

    <ol> <li>Separation by difference in density (ie. water and oil) 2. Filtration: separation of insoluble solids from a liquid 3. Chromatography: (the pen ink lab) 4. Distillation: separation of substances by difference in boiling points 5. Evaporation (you know this one I hope) 6. Magnetism</li> </ol> Signup and view all the answers

    Study Notes

    Mixtures and Pure Substances

    • Heterogeneous mixtures contain visibly different substances, e.g., concrete.
    • Intensive properties, such as density, remain unchanged regardless of the amount of substance.
    • Brass is not a pure substance; it is a mixture of metals.
    • Tap water is classified as a mixture, while distilled water is a pure substance.
    • Sodium chloride (table salt) is a pure substance and not a mixture.

    Properties of Matter

    • A sugar cube dissolving in water is an example of a physical change, not a chemical one.
    • Compounds are substances formed when atoms chemically combine and consist of more than one element.
    • Water is a classic example of a compound, specifically distilled water.
    • Temperature is an intensive property that does not change with the quantity of substance, unlike mass which is extensive.

    Changes in State

    • Changes in phase or state of matter, such as melting or boiling, are considered physical changes.
    • Gases can be compressed due to the significant empty space between particles.
    • Solids have a definite shape and volume and cannot be compressed, while liquids have a definite volume but an indefinite shape and can be slightly compressed. Gases have neither a definite shape nor volume and can be compressed easily.

    Characteristics of Mixtures vs. Compounds

    • Mixtures can be separated by physical means; compounds cannot.
    • Compounds are pure substances made up of more than one element and cannot be physically separated.

    Physical Properties

    • Extensive properties, like mass, depend on the amount of substance present.
    • The Tyndall effect distinguishes between colloids and solutions by observing light scattering: colloids show this effect, while solutions do not.
    • The Tyndall effect occurs when light is reflected by particles too small to be seen, helping to identify the nature of the mixture.

    Methods of Separating Matter

    • Matter can be separated physically through various methods:
      • Density difference (e.g., separating water and oil).
      • Filtration to remove insoluble solids from liquids.
      • Chromatography, as demonstrated in ink experiments.
      • Distillation, based on varying boiling points.
      • Evaporation to leave solids behind.
      • Magnetism to attract certain materials from a mixture.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on mixtures, pure substances, and the properties of matter. This quiz covers key concepts such as homogeneous and heterogeneous mixtures, intensive and extensive properties, and physical changes. Challenge yourself with questions about compounds and changes in state.

    More Like This

    Science Quiz on Pure Substances
    40 questions
    Unit 1: Matter and Mixtures Quiz
    27 questions
    Use Quizgecko on...
    Browser
    Browser