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Chapter 17

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Chapter 17 Classification of Matter SUBSTANCE SUBSTANCE Elements contain atoms that are all alike Compounds have 2 or more elements in fixed proportion Types of ... – PowerPoint PPT presentation

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Title: Chapter 17


1
Chapter 17 Classification of Matter
2
17.1 Composition of Matter
3
SUBSTANCE
An Element
or
A Compound
4
SUBSTANCE
  • Elements contain atoms that are all alike
  • Compounds have 2 or more elements in fixed
    proportion

5
Mixtures
2 or more substances can be separated by PHYSICAL
means to form a MIXTURE
6
Types of Mixtures
  • Heterogeneous
  • Mixture of different and easily distinguishable
    materials

7
Types of Mixtures
  • Homogeneous
  • Mixture containing 2 or more gaseous, liquid or
    solids blended evenly
  • Also a solution

8
Types of Mixtures
  • Colloids
  • Heterogeneous mixture
  • Particles never settle

9
Tyndall Effect
  • Scattering of light by particles in a colloid.
  • You can see a light beam as it passes through the
    colloid.

10
Types of Mixtures
  • Suspensions
  • Heterogeneous mixture
  • Visible particles settle

11
17.2 Properties of Matter
12
Physical Property characteristic that does not
change a substances identity
  • Color
  • Shape
  • Size
  • Melting point
  • Boiling point

13
Appearance physical description
How would you describe a pumpkin or cranberry
juice?
14
Behavior how a substance acts
Magnetism
Viscosity
Ductility
15
Using physical properties to separate mixtures
Iron/Wood use a magnet or density. Wood will
float in water
Gold Sifter
16
Chromatography separating substances based on
various chemical charges Picture pigments in
plants
17
Physical Change change in size, shape, or
state not in identity
Ex Freezing or Melting
18
Distillation used to separate a mixture
Distillation tower at an oil refinery
19
Chemical Property characteristics that indicate
if a substance can undergo a chemical change
  • Flammability
  • Light sensitivity

20
Chemical Change a new substance is formed
Temperature change, smell, bubble formation, rust
formation
21
Chemical changes can be used to separate
substances, mostly in industry.
Cleaning tarnish and separating metals from their
ores are example.
22
Weathering of Earths surface includes physical
and chemical changes.
  • Physical
  • Big rocks ? small rocks
  • Streams carry particles to other locations
  • Chemical
  • Acid rain

23
Law of Conservation of Mass Mass before change
Mass after change Mass of Reactants Mass of
Products
24
Some of the logs components combine with oxygen
to form gases.
When wood burns, ashes remain. How the mass is
conserved?
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