Science Class on Mixtures and Changes in Matter
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Questions and Answers

Is iron ore homogeneous or heterogeneous?

  • Heterogeneous (correct)
  • Homogeneous

    • Is quartz homogeneous or heterogeneous?

  • Heterogeneous
  • Homogeneous (correct)

    • Is granite homogeneous or heterogeneous?

  • Heterogeneous (correct)
  • Homogeneous

    • Is an energy drink homogeneous or heterogeneous?

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

    Is oil and vinegar salad dressing homogeneous or heterogeneous?

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

    Is salt homogeneous or heterogeneous?

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

    Is rainwater homogeneous or heterogeneous?

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

    Is nitrogen homogeneous or heterogeneous?

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

    Is ice melting a physical or chemical change?

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

    Is paper burning a physical or chemical change?

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

    Is metal rusting a physical or chemical change?

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

    Is gas pressure increasing a physical or chemical change?

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

    Is liquid evaporating a physical or chemical change?

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

    Is food digesting a physical or chemical change?

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

    What is the difference between a chemical and a physical change?

    <p>A chemical change involves rearranging atoms and forming new substances; a physical change does not affect composition.</p> Signup and view all the answers

    What is a homogeneous mixture?

    <p>A mixture in which the composition is uniform throughout.</p> Signup and view all the answers

    What is a heterogeneous mixture?

    <p>A mixture that is not uniform in composition; components are not evenly distributed.</p> Signup and view all the answers

    What is mass?

    <p>A measure of the amount of matter in an object.</p> Signup and view all the answers

    What is matter?

    <p>Anything that has mass and takes up space.</p> Signup and view all the answers

    What is an atom?

    <p>The basic unit of matter.</p> Signup and view all the answers

    What is a compound?

    <p>A substance made up of atoms of two or more different elements joined by chemical bonds.</p> Signup and view all the answers

    What is a physical property?

    <p>A characteristic of a pure substance that can be observed without changing it into another substance.</p> Signup and view all the answers

    What is a chemical property?

    <p>A characteristic of a pure substance that describes its ability to change into different substances.</p> Signup and view all the answers

    How is energy involved in chemical and physical changes?

    <p>Energy is absorbed or released, changing form or location but never created or destroyed.</p> Signup and view all the answers

    What is a period in the periodic table?

    <p>A horizontal row of elements.</p> Signup and view all the answers

    What are metals?

    <p>Elements that are good conductors of heat and electricity.</p> Signup and view all the answers

    What are non-metals?

    <p>Elements that are poor conductors of heat and electricity.</p> Signup and view all the answers

    What is a family or group in the periodic table?

    <p>A vertical column of elements.</p> Signup and view all the answers

    What is malleability?

    <p>A substance's ability to deform under pressure; can be hammered or rolled.</p> Signup and view all the answers

    At room temperature, most metals are...

    <p>Solid.</p> Signup and view all the answers

    What do elements in the same group have in common?

    <p>Similar chemical properties.</p> Signup and view all the answers

    What is the scientific method?

    <p>A logical, systematic approach to the solution of a scientific problem.</p> Signup and view all the answers

    What is a hypothesis?

    <p>A testable prediction, often implied by a theory.</p> Signup and view all the answers

    What should you wear when you are in any laboratory?

    <p>Goggles.</p> Signup and view all the answers

    What kind of shoes should you wear in a lab?

    <p>Close-toed shoes.</p> Signup and view all the answers

    What should you wear during labs to protect your clothes?

    <p>Apron.</p> Signup and view all the answers

    When should you wear rubber gloves?

    <p>When dealing with corrosive chemicals.</p> Signup and view all the answers

    What order should you do when mixing acid and water?

    <p>Acid then water.</p> Signup and view all the answers

    What is the procedure for using a fire extinguisher?

    <p>Pull pin, aim, squeeze, and pass over fire.</p> Signup and view all the answers

    What does corrosive mean?

    <p>Eating away gradually.</p> Signup and view all the answers

    What does toxic mean?

    <p>Poisonous.</p> Signup and view all the answers

    What does irritant mean?

    <p>Causing rash/allergic reactions.</p> Signup and view all the answers

    What does carcinogenic mean?

    <p>Causing cancer.</p> Signup and view all the answers

    What is flammability?

    <p>The ability to burn.</p> Signup and view all the answers

    What is radioactivity?

    <p>Emit particles/high energy waves.</p> Signup and view all the answers

    What does the hazard diamond indicate?

    <p>Right: Yellow, Reactivity Hazard</p> Signup and view all the answers

    What do the numbers mean on the hazard diamond?

    <p>~0= no hazard, ~1= slight hazard, ~2= hazard, ~3= extreme hazard, ~4= deadly.</p> Signup and view all the answers

    Study Notes

    Mixtures

    • Iron ore is classified as heterogeneous.
    • Quartz is a homogeneous mixture.
    • Granite is considered heterogeneous.
    • Energy drinks are homogeneous mixtures.
    • Oil and vinegar salad dressing is heterogenous.

    Changes in Matter

    • Melting ice represents a physical change.
    • Burning paper is a chemical change.
    • Rusting metal is a chemical change.
    • Increasing gas pressure is a physical change.
    • Evaporating liquid is a physical change.
    • Digesting food is a chemical change.

    Types of Changes

    • Chemical changes rearrange atoms, forming new substances with different properties.
    • Physical changes alter properties such as state or shape, but the substance's composition remains unchanged.

    Definitions

    • Homogeneous mixture: Uniform composition throughout.
    • Heterogeneous mixture: Non-uniform composition; components are not evenly distributed.
    • Mass: Measure of the amount of matter in an object.
    • Matter: Anything with mass and volume.
    • Atom: Basic unit of matter.
    • Compound: Substance made of two or more different elements bonded chemically.
    • Physical property: Observed without changing the substance.
    • Chemical property: Describes the ability to transform into different substances.

    Energy in Changes

    • Energy is absorbed or released during both chemical and physical changes but is not created or destroyed; it changes forms or location.

    Periodic Table

    • A horizontal row of elements is called a period.
    • Metals are good conductors of heat and electricity.
    • Non-metals conduct poorly.
    • A vertical column of elements is known as a family or group.
    • Elements in the same group exhibit similar chemical properties.

    Malleability

    • Malleability refers to the ability of a substance to deform under pressure, often observed when hammered or rolled.

    Laboratory Safety

    • Always wear goggles in the lab for eye protection.
    • Use close-toed shoes for foot safety.
    • Wear an apron to protect clothing from spills.
    • Use rubber gloves when handling corrosive chemicals.
    • When mixing acids and water, always add acid first.

    Fire Safety

    • Fire extinguishers should be used by pulling the pin, aiming, squeezing, and sweeping across the fire.

    Hazardous Substances

    • Corrosive substances gradually eat away materials.
    • Toxic substances are poisonous.
    • Irritants can cause rashes or allergic reactions.
    • Carcinogenic substances are linked to cancer risks.
    • Flammability indicates the ability to burn.
    • Radioactivity refers to the emission of particles or high-energy waves.

    Hazard Identification

    • Hazard diamonds indicate dangers:
      • Red (top): Flammable
      • Blue (left): Health hazard
      • White (bottom): Special information
      • Yellow (right): Reactivity hazard
    • Numbers on hazard diamonds signify the level of hazard, ranging from 0 (no hazard) to 4 (deadly hazard).

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    Description

    This quiz covers essential concepts related to mixtures and changes in matter. You'll explore the differences between homogeneous and heterogeneous mixtures, as well as physical and chemical changes. Test your understanding of these fundamental science principles.

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