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Physical and Chemical Changes

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Physical and Chemical Changes Objective 4 TEKS 8A Marivel Macias Chemical Change The elements and/or compounds at the start of the reaction are rearranged into new ... – PowerPoint PPT presentation

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Title: Physical and Chemical Changes


1
Physical and ChemicalChanges
  • Objective 4
  • TEKS 8A

Marivel Macias
2
Chemical Change
  • The elements and/or compounds at the start of the
    reaction are rearranged into new product(s) (i.e.
    compounds or elements).

3
Oxidation of Iron - a chemical change
  • For example iron has the potential to rust given
    the right conditions. This is a chemical
    property.
  • If iron does rust, this is a slow chemical change
    since rust is an iron oxide with different
    properties than iron metal.

Iron oxygen water ? Iron rust.
4
Physical Change
  • A physical change takes place without any changes
    in molecular composition.
  • The same element or compound is present before,
    during and after the change.

5
Changes in States - a physical change
  • The three states of matter are solid, liquid,
    and gas.

6
Digestion Physical or Chemical Change?
  • Identify the following
  • Biting an apple
  • Chewing
  • Swallowing
  • Break down of carbohydrates in stomach, small
    intestine and large intestine.

7
Rock Cycle Physical or Chemical Changes?
8
Physical or Chemical Change?
9
Physical or Chemical Change?
  • Phase Change
  • From liquid water to gas vapor
  • Boiling Point
  • 100 degrees Celsius at 1 atm

10
Physical or Chemical Change?
  • Dry Ice Sublimation
  • carbon dioxide (s) ? carbon dioxide (g)

11
Physical or Chemical Change?
Plus Heat Energy
12
Physical or Chemical Change?
Iodine Zinc ? Zinc Iodide
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