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Chemical and Physical Changes

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Chemical and Physical Changes Physical Changes Only changes physical properties, does not become a new substance (usually reversible). Phase changes Dissolving ... – PowerPoint PPT presentation

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Title: Chemical and Physical Changes


1
Chemical and Physical Changes
2
Physical Changes
  • Only changes physical properties, does not become
    a new substance (usually reversible).
  • Phase changes
  • Dissolving
  • Breaking

3
Chemical Changes
  • When 1 or more substances form a new substance.
  • Evidence
  • Production of a gas (not phase change)
  • Formation of a precipitate
  • Change in color
  • Change in temperature (without
  • heat being added or taken
  • away)
  • Emission of light or odor

4
Is it a chemical or physical change?
  • Sugar dissolving in tea
  • Chemical Change
  • Physical Change

5
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

6
Correct!
7
Is it a chemical or physical change?
  • Logs burning
  • Chemical Change
  • Physical Change

8
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

9
Correct!
10
Is it a chemical or physical change?
  • Cutting paper
  • Chemical Change
  • Physical Change

11
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

12
Correct!
13
Is it a chemical or physical change?
  • Crushing an aspirin
  • Chemical Change
  • Physical Change

14
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

15
Correct!
16
Is it a chemical or physical change?
  • Metal rusting
  • Chemical Change
  • Physical Change

17
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

18
Correct!
19
Is it a chemical or physical change?
  • Lighter fluid burning
  • Chemical Change
  • Physical Change

20
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

21
Correct!
22
Is it a chemical or physical change?
  • An egg rotting
  • Chemical Change
  • Physical Change

23
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

24
Correct!
25
Is it a chemical or physical change?
  • An egg breaking
  • Chemical Change
  • Physical Change

26
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

27
Correct!
28
Law of Conservation of Mass
  • No matter what change occurs
  • mass before mass after
  • of atoms before of atoms after

29
Images Cited
  • http//www.learner.org/channel/courses/essential/p
    hysicalsci/session4/closer1.html
  • http//www.hcbe.net/itc/powerpoints/science/files/
    CF61DBA93ED44B4B8A5C75E1A1AEB2CC.ppt
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