Physical Science: Chapter 3 sec3
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Physical Science: Chapter 3 sec3

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Notes from 10/04/10

Notes from 10/04/10

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    Physical Science: Chapter 3 sec3 Physical Science: Chapter 3 sec3 Presentation Transcript

    • Chapter 3, Sec 3 Chemical Properties Page 91 10/04/10
    • Warm Up 10/01/10
      • An object is measured using the displacement method.
      • The graduated cylinder measures 25mL of water before the object is added.
      • The cylinder measures 50mL after the object is added.
      • What is the volume of the object in cm 3 ?
    • Chemical Properties
      • Property of matter that describes a substance’s ability to participate in a chemical reaction.
    • Reactivity
      • The ability of a substance to change into one or more new substances.
        • Flammability
          • Wood has flammability (ability to burn)
          • Ash does not have flammability
    • Comparing Physical and Chemical Properties
      • Physical property – can be observed without changing substance.
        • Density, thermal conductivity
      • Chemical property – substance needs to change to observe a chemical property.
        • Wood needs to burn to know its flammable.
    • Signs of a chemical change:
      • If there is a change in the following it is most likely a chemical reaction:
        • Color
        • Odor
        • Fizz and foam (creating gas)
        • Sound
        • Light
        • Sudden heat (or cold)
    • Irreversible
      • You can not un-burn a piece of paper, or un-rust a nail. (not easily)
    • Practice
      • Chemical or Physical change?
      • ___ Iron rusts
      • ___ Sugar dissolved in water
      • ___ Burning match
      • ___ Cube of ice that melts
      • ___ Water changing into steam
      • ___ Sour milk
    • Homework
      • Section Review: page 95, Numbers 1-5
        • Read Chapter 3: Section 3