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Physical Or Chemical Change Qz
 

Physical Or Chemical Change Qz

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    Physical Or Chemical Change Qz Physical Or Chemical Change Qz Presentation Transcript

    • Chemical Properties & Physical and Chemical Changes
    • Physical changes are those changes that do not result in the production of a new substance.  If you melt a block of ice, you still have H 2 O at the end of the change.   
    • If you break a bottle, you still have glass.  Painting your nails will not stop them from being fingernails.  Some common examples of physical changes are: melting, freezing, condensing, breaking, crushing, cutting, and bending.
    • Some, but not all physical changes can be reversed. You could refreeze the water into ice, but you cannot put your hair back together if you don’t like your haircut!
    • Special types of physical changes where any object changes state, such as when water freezes or evaporates, are sometimes called change of state operations .
    • CHEMICAL PROPERTIES Chemical properties can ONLY be observed AS the substances are changing into different substances.
    • Chemical changes , or chemical reactions, are changes that result in the production of another substance. 
    • FLAMMABILITY: A material’s ability to BURN in the presence of OXYGEN
    • REACTIVITY: How readily (easily) a substance combines chemically with other substances.
    • Which has higher reactivity? A 14 karat gold ring or a cheap metal ring from the vending machine at the grocery store? What is your evidence?
    • Recognizing Chemical Changes: Please read 56-57 in your book and take notes on the 3 types of chemical change.
    • When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon.  When you light your Bunsen burner in lab, you are carrying out a chemical reaction that produces water and carbon dioxide. 
    • Common examples of chemical changes that you may be somewhat familiar with are; digestion, respiration, photosynthesis, burning, and decomposition. 
    • Physical or Chemical Change?
      • Painting Wood
      • PHYSICAL
    • Physical or Chemical Change?
      • Burning Paper
      • CHEMICAL
    • Physical or Chemical Change?
      • Digestion of food
      • CHEMICAL
    • Physical or Chemical Change?
      • Sugar dissolving in water
      • PHYSICAL
    • Physical or Chemical Change?
      • Iron turning red when heated
      • PHYSICAL
    • Physical or Chemical Change?
      • Evaporation
      • PHYSICAL
    • Physical or Chemical Change?
      • A pond freezing in winter
      • PHYSICAL
    • Physical or Chemical Change?
      • Melting ice
      • PHYSICAL
    • Physical or Chemical Change?
      • Cutting wire
      • PHYSICAL
    • Physical or Chemical Change?
      • Painting fingernails
      • PHYSICAL
    • Physical or Chemical Change?
      • Cutting fabric
      • PHYSICAL
    • Physical or Chemical Change?
      • Baking muffins
      • CHEMICAL
    • Physical or Chemical Change?
      • Shattering glass
      • PHYSICAL
    • Physical or Chemical Change?
      • Decomposition of old leaves
      • CHEMICAL
    • Physical or Chemical Change?
      • Wrinkling a shirt
      • PHYSICAL
    • Physical or Chemical Change?
      • An old nail rusting
      • CHEMICAL