Physical properties describe the look or feel of a substance' - PowerPoint PPT Presentation

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Physical properties describe the look or feel of a substance'

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A material in which atoms of different elements are bonded to one another. chemical formula ... Most Materials are. Mixtures. Mixture. A combination of two or ... – PowerPoint PPT presentation

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Title: Physical properties describe the look or feel of a substance'


1
Physical properties describe the look or feel
of a substance.
2
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3
During a physical change a substance changes
some physical property…
…but it is still the same material with the same
chemical composition.
4
Chemical Property
The tendency of a substance to change into
another substance.
5
Chemical Change
Any change involving a rearrangement of atoms.
6
Carbon dioxide
Oxygen
Carbon
7
During a chemical reaction new materials are
formed by a change in the way atoms are bonded
together.
8
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10
2.2 Atoms Are the Fundamental Components of
Elements
11
Element
Any material consisting of only one type of atom.
12
Atomic Symbol
One or two letters used to designate an element.
13
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14
The Periodic Table
15
METALS NONMETALS
  • Left side of periodic table
  • Shiny opaque
  • Good conductors of electricity
  • Malleable
  • Usually solid at RT
  • Right side of periodic table
  • Transparent
  • Poor conductors of electricity
  • Brittle
  • Solid, liquid or gas at RT

16
  • Group (Family) Vertical column on the Periodic
    Table. Chemical and physical properties of
    elements in a group are similar.

17
  • Period Horizontal row on the Periodic Table.
    Across a row, chemical and physical properties
    change gradually.

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19
Elemental Formula
Used to show how atoms within an element are
grouped
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21
Compound
A material in which atoms of different elements
are bonded to one another.
22
chemical formula
The combination of atomic symbols of the elements
of a compound
23
Sodium chloride, NaCl
24
Ammonia,
NH
3
25
Compounds have properties that are uniquely
different from the elements from which they are
made.
26
Chemical Formula
Compound
Sodium chloride
Cl
Na
27
Na soft, silvery metal. Melts at 97.5?C. Cl2-
yellow, green gas. Very toxic. Boils at
234?C. NaCl Brittle, colorless crystal. Melts
at 800?C. Essential for life.
28
Guideline 1
Start with the element farthest to the left in
the periodic table…
…for the element farthest to the right, add the
suffix -ide
29
Example
NaCl
Sodium
ine
Chlor
30
Example
NaCl
Sodium
Chlor
ine
31
HCl MgO CaF2 KBr
32
Guideline 2
With different possible combinations of elements…

…use prefixes to remove any ambiguity.
33
mono-
1
di-
2
tri-
3
tetra-
4
34
Examples
2
dihydrogen dioxide
H O CCl4 carbon tetrachloride
2
2
35
Guideline 3
Common names are also sometimes used for
convenience.
36
2.4 Most Materials are Mixtures
37
Mixture
A combination of two or more substances…
…in which each substance retains its properties.
38
The formation of a mixture is different from the
formation of a compound.
39
Sodium chloride, NaCl
40
The formation of a mixture
41
Element, Mixture or Compound ????
42
Pure
Consisting of only a single element or a single
compound.
43
Impure
A mixture…
…containing two or more elements or compounds.
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Solution or Suspension ????
  • Solution all components are in the
  • same phase
  • Suspension components are mixed, but in
    different phases

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