Physical Science: Chapter 3 sec3

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Notes from 10/04/10

Notes from 10/04/10

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Transcript

  • 1. Chapter 3, Sec 3 Chemical Properties Page 91 10/04/10
  • 2. 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 ?
  • 3. Chemical Properties
    • Property of matter that describes a substance’s ability to participate in a chemical reaction.
  • 4. 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
  • 5. 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.
  • 6. 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)
  • 7. Irreversible
    • You can not un-burn a piece of paper, or un-rust a nail. (not easily)
  • 8. Practice
    • Chemical or Physical change?
    • ___ Iron rusts
    • ___ Sugar dissolved in water
    • ___ Burning match
    • ___ Cube of ice that melts
    • ___ Water changing into steam
    • ___ Sour milk
  • 9. Homework
    • Section Review: page 95, Numbers 1-5
      • Read Chapter 3: Section 3