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Properties and Changes in Matter

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Title: Properties and Changes in Matter Author: Stephanie Last modified by: Stephanie Created Date: 9/22/2010 2:54:35 AM Document presentation format – PowerPoint PPT presentation

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Title: Properties and Changes in Matter


1
Properties and Changes in Matter
  • Ch. 20

2
Physical Property
  • A characteristic that you can observe without
    changing or trying to change the composition of
    the substances.

3
Physical Property
  • How something looks, smells, or tastes are all
    examples of physical properties.

4
Physical Properties
  • You can detect many physical properties with your
    senses.

5
Mass
  • Mass is a measurement of how much matter an
    object contains.

6
Weight
  • Weight is a measurement of force.
  • Weight depends on the mass of the object and on
    gravity.
  • No matter where you are in the universe your mass
    never changes, but your weight can.

7
Density
  • Density measures the amount of mass in a given
    volume.
  • Density mass/volume
  • Dm/v

8
Solubility
  • Solubility is the ability of one substance to
    dissolve into another substance.

9
Melting Point
  • The temperature at which a solid changes into a
    liquid is its melting point.

10
Boiling Point
  • The temperature at which a liquid changes into a
    gas is called its boiling point.

11
Magnetism
  • Magnetism is a physical property.

12
Chemical Property
  • A chemical property is a characteristic that
    cannot be observed without altering the substance.

13
Chemical Properties
  • Examples of chemical properties
  • Flammability, rusting, reacting with other
    substances.

14
Physical Changes
  • A physical change in one in which the form or
    appearance of matter changes, but not its
    composition.

15
Changing State
  • Vaporization is the process by which matter from
    a liquid to a gas.

16
Changing State
  • Condensation is the process where a gas changes
    into a liquid.

17
Changing State
  • Sublimation is the process in which a solid
    changes directly into a gas
  • EX dry ice

18
Changing State
  • Deposition is the process in which a gas changes
    into a solid.

19
Chemical Changes
  • Chemical Changes occur when substances are
    changed into different substances.

20
Clues to Chemical Changes
  • Color change is an example of a chemical change.

21
Clues to Chemical Changes
  • Another sign of a chemical change is the release
    or gain of energy by an object.

22
Clues to Chemical Changes
  • The change in odor is a clue to a chemical change.

23
Signs of Chemical Change
  • The production of bubbles is a sign that a
    chemical change has taken place.

24
Clues to Chemical Change
  • Another clue to chemical change is the formation
    of a solid.

25
Chemical Changes
  • The substances produced during a chemical change
    cannot be changed back into the original
    substances by physical means.

26
Chemical vs. Physical
  • During a physical change the composition of the
    substance does not change, but during a chemical
    change the composition of the substance does
    change.

27
Conservation of Mass
  • Law of conservation of mass states that mass is
    neither created nor destroyed. As a result the
    mass of the substances before a physical or
    chemical change is equal to the mass of the
    substances present after the change.

28
Chemical vs. Physical
  • Chemical and Physical changes game.
  • http//reviewgamezone.com/game.php?id49
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