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Matter: anything that has mass and volume

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Reviewing MATTER Matter: anything that has mass and volume Mass the amount of matter in something Volume the amount of space something occupies – PowerPoint PPT presentation

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Title: Matter: anything that has mass and volume


1
Reviewing MATTER
  • Matter anything that has mass and volume
  • Mass the amount of matter in something
  • Volume the amount of space something occupies

2
Physical and Chemical Properties of Matter
  • Why do I care? Understanding the different
    properties of matter will help you to better
    classify and describe the world around you.

3
What is a property?
  • Property a characteristic of a substance that
    can be observed
  • It can be a physical or chemical property.

4
Physical Property
- A property that can be observed and measured
without changing the materials composition.
5
  • EXTENSIVE Physical Property
  • Extensive - Properties that depend on the amount
    of matter present.
  • Mass - A measurement of the amount of matter in
    a object (grams).
  • Weight - A measurement of the gravitational
    force of attraction of the Earth acting on an
    object.
  • Volume - A measurement of the amount of space a
    substance occupies.
  • Length

6
Extensive Physical Properties
  • Look at your pencil or pen, if you break it in
    half, the extensive properties will be different.
  • The pieces will have a different mass, weight,
    volume, and length.
  • Extensive properties depend on size

7
INTENSIVE Physical Property
  • Intensive - Properties that do not depend on the
    amount of the matter present.
  • Color
  • Odor
  • Luster
  • Malleability
  • Ductility
  • Electrical Conductivity
  • Hardness
  • Melting/Freezing/Boiling Points
  • Density
  • State of Matter

8
Intensive Physical Properties
  • Look at your pencil or pen, if you break it in
    half, the intensive properties will be the same.
  • Its still yellow, the graphite still has a
    hardness of 2, the density of each piece hasnt
    changed, and its still a solid.
  • Intensive properties DONT depend on size

9
Chemical Properties
  • Chemical property a property that can only be
    observed by changing the composition of the
    material.
  • Does it have the potential to change into a new
    substance?
  • Examples
  • Will it burn?
  • Will it rust?
  • Will it react with vinegar (acids) or other
    chemicals?

10
Physical and Chemical Properties can be used to
identify matter
  • Gold or fools gold?
  • Diamond or quartz?
  • Oak or Maple?
  • Metamorphic or Igneous?
  • Zinc or Aluminum?

http//www.youtube.com/watch?vuJOGy0dgmUU Propert
ies song
11
PHYSICAL CHEMICAL CHANGES
12
Changes in Matter
  • Change the act of altering a substance
  • In science, we talk of two types of changes
  • physical
  • chemical

13
Physical Change
  • Physical change a change that occurs that does
    not change the identity or make up of the
    substance
  • Change in state or phase (Freezing, boiling,
    melting, sublimating)
  • Changing shape (cutting, folding, twisting,
    bending)
  • Dissolving

14
Physical Changes
  • Physical changes are changes that alter the size,
    shape, location or physical state of a substance
    but not its chemical state.
  • Its still H2O- frozen in snowflakes, as liquid in
    raindrops, or as a gaseous water vapor, its
    chemical formula has not changed.

15
Examples
  • A physical change in a substance doesn't change
    what the substance is.
  • Cutting, folding, or crumpling paper
  • A physical change in the shape and size of the
    paper. However, it is still paper!
  • Dissolving sugar in iced tea-
  • Sugar is still C6H12O6 but now it is spread out
    in the liquid, it still tastes just as sweet!

16
What Other Kinds of Changes Are Physical?
  • Cutting
  • Tearing
  • Shredding
  • Shrinking
  • Enlarging
  • Change in Phase
  • Relocating
  • Rotating
  • Molding (shaping)

17
Chemical Changes
  • Chemical change a change that occurs causing
    the identity of the substance to change
  • Burning
  • Chemically digesting food (acid and bile)
  • Reacting with other substances
  • A chemical change is also called a chemical
    reaction

18
Chemical Changes
  • Chemical changes are changes that alter the
    chemical make up of the substance.
  • New matter is formed with properties that are
    different than those of the original matter.

19
Chemical Changes
  • If you end up with a chemical or chemicals that
    you did not start with. . .
  • It is a chemical change!

20
Chemical Changes
  • A chemical change is not easily reversed.

Difficult to reverse/change back
Easy to reverse/change back
21
Signs That a Chemical Change has occurred
  • Creation of a gas (bubbles)
  • Creation or loss of heat
  • Fire
  • Rotting/molding
  • Breaking down (decomposition)
  • Precipitation (Sour milk clumps)
  • Cooking
  • Rusting (oxidation)

22
Chemical Change
Heat and light are often evidence of a chemical
change.
23
The strike of a match is a chemical change due to
the reaction of the chemicals with oxygen.
24
Burning wood turns to charcoal and ashes. This is
a chemical change.
25
Is it Physical or Chemical?
Change Physical Chemical
Melting cheese
Burning wood
Milk souring
Folding up paper
Bicycle rusting
26
Why do I care?
  • Physical and Chemical changes occur around us
    everyday! Understanding them will help us better
    understand our world.

27
  • Start physical changes challenge Powerpoint
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