Classifying Matter: Pure Substances and Mixtures
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Questions and Answers

What is a pure substance?

  • A mixture that appears the same throughout.
  • A method used to separate a mixture.
  • Contains only one type of matter, chemically connected. (correct)
  • Contains two or more different types of matter.

    • What is a mixture?

  • A compound formed by chemical bonds.
  • Contains two or more different types of matter. (correct)
  • Homogeneous mixture.
  • Contains only one type of matter.

    • What is a solution?

    A homogeneous mixture throughout which two or more substances are uniformly dispersed.

    Soluble means a substance can be dissolved in another substance.

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

    Insoluble means able to dissolve in another substance.

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

    What is a homogeneous mixture?

    <p>A mixture that appears the same throughout.</p> Signup and view all the answers

    What is a heterogeneous mixture?

    <p>A mixture in which the parts are not evenly mixed or distributed.</p> Signup and view all the answers

    What is filtering?

    <p>A procedure used to separate a mixture of a solid and a liquid by particle size.</p> Signup and view all the answers

    What is chromatography?

    <p>A method used to separate a mixture due to differences in mass.</p> Signup and view all the answers

    What is distillation?

    <p>Separation of a mixture using differences in boiling point.</p> Signup and view all the answers

    How does distillation work?

    <p>The liquid with the lowest boiling point turns to gas first, then condenses back into a liquid.</p> Signup and view all the answers

    Hot tea is a heterogeneous mixture.

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

    Flat pop is a homogeneous mixture.

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

    Carbonated pop is a homogeneous mixture.

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

    Windex is a homogeneous mixture.

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

    Raisin bran is a homogeneous mixture.

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

    Tacos are a homogeneous mixture.

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

    Vanilla ice cream is a homogeneous mixture.

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

    Alloys, or metal mixtures, are homogeneous.

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

    Lithium (Li) is a pure substance.

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

    Lithium Chloride (LiCl) is a mixture.

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

    Rubbing alcohol is a pure substance.

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

    Glucose is a pure substance.

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

    Distilled water is a mixture.

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

    Tap water is a pure substance.

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

    Coffee is a pure substance.

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

    Steel is a pure substance.

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

    Air is a pure substance.

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

    Soda pop is a pure substance.

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

    Salt water is a pure substance.

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

    Cake batter is a homogeneous mixture.

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

    Kool-aide is a homogeneous mixture.

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

    Pretzel mix is a homogeneous mixture.

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

    Fruit salad is a homogeneous mixture.

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

    Gold (Au) is a pure substance.

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

    Trail mix is a pure substance.

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

    Helium (He) is an element.

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

    Silver (Ag) is a compound.

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

    Silver chloride is an element.

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

    Propene is a compound.

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

    Study Notes

    Pure Substances

    • Defined as matter containing only one type of material chemically bonded together.
    • Common examples include gold, iron, water, and oxygen.

    Mixtures

    • Composed of two or more different types of matter that can be separated by physical means.
    • Examples include sea water, Coca-Cola, and wine.

    Solutions

    • A type of homogeneous mixture where two or more substances are uniformly dispersed.

    Solubility

    • Refers to a substance’s ability to dissolve in another substance, commonly water.

    Insolubility

    • Indicates the inability of a substance to dissolve in another substance, such as water.

    Mixture Types

    • Homogeneous Mixtures: Appear uniform throughout, such as sweet tea, air, and alloys.
    • Heterogeneous Mixtures: Components are not evenly mixed, exemplified by chocolate chip cookies, smoothies, and salads.

    Separation Techniques

    • Filtering: A method to separate solids from liquids using filter paper based on particle size (e.g., sand from water).
    • Chromatography: Separates mixtures based on differences in mass, such as separating different ink pigments.
    • Distillation: Utilizes differences in boiling points for separation, followed by condensation into liquid (e.g., salt from water).

    Homogeneous vs. Heterogeneous

    • Hot tea and flat soda are homogeneous, implying uniformity.
    • Carbonated soda, carbonated pop, raisin bran, tacos, and fruit salad are classified as heterogeneous due to visible differences in components.

    Examples of Substances

    • Pure Substances: Lithium (Li), lithium chloride (LiCl), rubbing alcohol, glucose, and distilled water.
    • Mixtures: Tap water, coffee, steel, air, soda pop, and salt water.
    • Cake batter and Kool-Aid are examples of homogeneous mixtures, while pretzel mix and fruit salad are heterogeneous.

    Elements and Compounds

    • Elements are pure substances like helium (He) and silver (Ag).
    • Compounds include silver chloride and propene, which are formed from combinations of elements.

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    Description

    Test your understanding of pure substances and mixtures with these flashcards. Learn the definitions and examples of each category, including solutions and heterogeneous mixtures. This quiz will help reinforce key concepts in chemistry.

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