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Properties used to describe matter can be classified as extensive or intensive.

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Describing Matter Properties used to describe matter can be classified as extensive or intensive. An extensive property is a property that depends on the amount of ... – PowerPoint PPT presentation

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Title: Properties used to describe matter can be classified as extensive or intensive.


1
Describing Matter
  • Properties used to describe matter can be
    classified as extensive or intensive.
  • An extensive property is a property that depends
    on the amount of matter in a sample.
  • An intensive property is a property that depends
    on the type of matter in a sample, not the amount
    of matter.

2
Describing Matter
2.1
  • Extensive properties depend on amount.
  • The mass of an object is a measure of the amount
    of matter the object contains.
  • The volume of an object is a measure of the space
    occupied by the object.

The big ball has more mass and volume than the
little ball.
3
Describing Matter
2.1
  • Intensive Properties
  • The hardness of a bowling ball is an example of
    an intensive property.

4
Is flammability an extensive or intensive
property?
5
Identifying Substances
2.1
  • Matter that has a uniform and definite
    composition is called a substance.
  • A substance is pure.

6
Identifying Substances
2.1
  • Every sample of a given substance has identical
    intensive properties because every sample has the
    same composition.
  • Example- Every sample of pure water is a clear,
    odorless, liquid at room temperature. The water
    will boil at 100ºC and freeze at 0ºC. These
    properties are intensive because they do not
    depend on how big the sample is.

7
Identifying Substances
2.1
  • A physical property is a quality or condition of
    a substance that can be observed or measured
    without changing the substances composition.
  • Hardness, color, conductivity, and malleability
    are examples of physical properties.

8
Identifying Substances
2.1
9
States of Matter
2.1
  • What are three states of matter?
  • Three states of matter are solid, liquid, and
    gas.

10
States of Matter
2.1
  • Solids
  • A solid is a form of matter that has a definite
    shape and volume.

11
States of Matter
2.1
  • Liquid
  • A liquid is a form of matter that has an
    indefinite shape, flows, yet has a fixed volume.

12
States of Matter
2.1
  • Gases
  • A gas is a form of matter that takes both the
    shape and volume of its container.
  • The gas state is the only state of matter that is
    compressible.

13
States of Matter
2.1
  • Vapor describes the gaseous state of a substance
    that is generally a liquid or solid at room
    temperature, as in water vapor.

14
States of Matter
  • Macroscopic qualities- volume, shape, and
    compressibility
  • Microscopic properties- Relate the states of
    matter to the arrangements of their particles.

15
States of matter- the 3 forms at which matter
exists
Solid- particles are tightly packed in a rigid
structure. Has a shape and a fixed volume!
Liquid- particles are very close but can move
around each other. Takes the shape of its
container, but has a fixed volume.
Gas- particles are far apart and have little
effect on each other. Has no fixed shape or
volume.  
16
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17
Substances go from solid to liquid to gas as
energy increases.
18
Physical Changes
2.1
  • During a physical change, some properties of a
    material change, but the composition of the
    material does not change.
  • As gallium melts in a persons hand, the shape of
    the sample changes, but the composition of the
    material does not change.

19
Physical Changes
2.1
  • Physical changes can be classified as reversible
    or irreversible.
  • All physical changes that involve a change from
    one state to another are reversible.
  • Cutting hair, filing nails, and cracking an egg
    are examples of irreversible physical changes.

20
2.1 Section Quiz.
  • 1.Which of the following would be described as an
    extensive property of matter?
  • temperature
  • color
  • mass
  • hardness

21
2.1 Section Quiz.
  • 2. Which properties can be observed without
    changing the composition of a substance?
  • all properties of a substance
  • intensive properties
  • chemical properties
  • physical properties

22
2.1 Section Quiz.
  • 3. Match the states of matter with the following
    descriptions
  • (1) takes the volume and shape of its container
  • (2) has a definite shape and volume
  • (3) has a definite volume but an indefinite shape
  • (1) liquid, (2) solid and (3) gas
  • (1) gas, (2) solid, and (3) liquid
  • (1) gas, (2) liquid, and (3) solid
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