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Physical and Chemical Changes

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Physical and Chemical Changes Is it a chemical or physical change? Lighter fluid burning Chemical Change Physical Change OOPS! Did it change size, color, shape ... – PowerPoint PPT presentation

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Title: Physical and Chemical Changes


1
Physical and Chemical Changes
2
Everything that has mass and volume is called
matter.Everything is made of matter
What is matter?
3
Matter has properties
  • Two basic types of properties that we can
    associate with matter.
  • Physical properties
  • Chemical properties

4
What are properties?
  • h
  • Characteristics used to identify, describe and
    classify matter
  • Two basic types of properties of matter are
    Physical properties and Chemical properties

5
Physical Properties
  • Characteristic of a substance that can be
    measured/observed (using your senses) without
    changing the substance into something else.

Hardness Texture Color
Odor Taste Temperature
6
More EXAMPLES - Physical
  • size, shape, freezing point, boiling point,
    melting point, density, mass, volume, Physical
    State (solid, liquid or gas) magnetism,
    viscosity, density, luster and many more.
  • Viscosity - The resistance of a liquid to
    flowing.
  • Examples
  • Low viscosity-water, rubbing alcohol
  • High viscosity-honey

7
Chemical Properties
  • Chemical properties are characteristics involved
    when a substance interacts with another substance
    to change its chemical make-up.

Flammability Rusting Creating gas bubbles
Creating a new chemical product Reactivity with water pH
8
Alike? Different?
  • Draw a double bubble map in your notes to compare
    and contrast physical and chemical properties.

9
Matter
  • Matter is everywhere.
  • Matter is anything that takes up space and has
    mass.
  • Matter is constantly experiencing both chemical
    and physical changes.

10
Physical Change
  • Physical changes occur when matter changes its
    property but not its chemical nature.
  • Physical property changes could include a change
    in texture, shape, size, color, volume, mass,
    weight, and density.

11
Examples of Physical Changes
  • Boiling
  • Freezing
  • Dissolving
  • Breaking
  • Making a mixture
  • 2 or more types of matter (substances) mixed
    together
  • Not in specific amounts
  • Can be separated physically

12
Chemical Change
  • Chemical changes are changes matter undergoes
    when it becomes new or different matter.
  • To identify a chemical change look for signs such
    as, bubbling and fizzing, light production, color
    change with an odor, smoke, and presence of heat.

13
Evidence of a Chemical Change
  • Formation of gas
  • Formation of precipitate (a solid that results
    from two liquids reacting)
  • Change in color
  • Change in energy
  • Endothermic Absorbs heat energy (gets cold)
  • Exothermic Releases heat energy (gets hot)

14
What kind of changes does matter undergo?
  • The type of change that occurs in matter depends
    on the type of properties that are changed.
  • Physical changes change physical properties only
  • Chemical changes change chemical properties and
    physical properties

15
Chemical Changes
  • The composition of the substance changes.
  • The substances present at the beginning of the
    change are not present at the end new substances
    are formed. The change cannot be undone.

16
Is it a chemical or physical change?
  • Sugar dissolving in tea
  • 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?
  • Logs 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?
  • Breaking water up by separating it into hydrogen
    and oxygen
  • 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?
  • Cutting paper
  • 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
Is it a chemical or physical change?
  • Crushing an aspirin
  • Chemical Change
  • Physical Change

29
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

30
Correct!
31
Is it a chemical or physical change?
  • Metal rusting
  • Chemical Change
  • Physical Change

32
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

33
Correct!
34
Is it a chemical or physical change?
  • Lighter fluid burning
  • Chemical Change
  • Physical Change

35
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

36
Correct!
37
Is it a chemical or physical change?
  • An egg rotting
  • Chemical Change
  • Physical Change

38
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

39
Correct!
40
Is it a chemical or physical change?
  • An egg breaking
  • Chemical Change
  • Physical Change

41
OOPS!
  • Did it change size, color, shape (Physical
    Change)?
  • or
  • Did it become different matter (Chemical Change)?

42
Correct!
43
Writing Activity
  • Write a paragraph about the difference between a
    chemical and physical change. Give examples of
    each.
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