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Physical Properties Physical Changes Chemical Properties Chemical Changes

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Physical Properties Physical Changes Chemical Properties Chemical Changes Physical Properties Can be observed without changing the identity of the matter. – PowerPoint PPT presentation

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Title: Physical Properties Physical Changes Chemical Properties Chemical Changes


1
Physical Properties Physical Changes Chemical
Properties Chemical Changes
2
Physical Properties
  • Can be observed without changing the identity of
    the matter.

3
Physical Properties
  • What are some physical properties?
  • color
  • melting and boiling point
  • odor

4
Physical Changes
  • Alters the form or appearance of a material but
    does not convert the material into new substance.

5
Physical Changes
  • can be observed without changing the identity of
    the substance
  • Some physical changes would be
  • boiling of a liquid
  • melting of a solid
  • dissolving a solid in a liquid to give a
    homogeneous mixture a SOLUTION.

6
Chemical Properties
  • Is a property of matter that describes a
    substance based on its ability to change into a
    new substance.
  • This property becomes apparent during a chemical
    reaction, and can only be observed by changing a
    substance's chemical identity.

7
Examples of Chemical Properties
  • Reactivity
  • Flammability (the ability to catch on fire)
  • Toxicity (the ability to be poisonous),
  • Oxidation (the ability to react with oxygen,
    which causes apple slices to turn brown and iron
    to rust),
  • Sensitivity to light

8
Chemical Changes
  • A change in matter that forms one or more new
    substances with different properties.

9
Oxygen is highly reactive and can combine with
almost any element.
Hydrogen is highly flammable.
Hydrogen
Oxygen
Hydrogen and Oxygen are both gasses.
10
The reactants H2 and 02
H
H
O
O
H
H
11
Combine to form H2O
H
H
Energy
The Products
O
O
H
H
12
Water has completely different properties than
the reactants that make it up.
13
Hydrogen
Oxygen
Water
14
Physical property or chemical Property?
  • When considering properties to help decide ask
    yourself does observing the property cause a new
    substance to form?.

15
Signs of a Chemical Change
  • Heat (Exothermic)
  • Cooling (Endothermic)
  • Bubbles
  • Light
  • Precipitation
  • Color change

16
Physical vs. Chemical
  • physical
  • chemical
  • physical
  • physical
  • chemical
  • Examples
  • melting point
  • flammable
  • density
  • magnetic
  • tarnishes in air

17
Chemical or Physical Change
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