Classification of Matter

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Classification of Matter
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Pure Substances

• Have specific properties that identify it
  (physical or chemical)
• Can be elements or compounds

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Elements

• Substances with only one kind of atom
• Can be monatomic or in molecules
• O2 or O3 or N2
• May have more than one form called allotropes ex
  O2 and O3

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Allotropes of C
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Periodic Table
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Pure Substances contd

• Compounds- composed of more than one kind of atom
• Have definite composition
• Properties are different than those of the
  individual elements
• Are represented by formulas
• Ex H2O2, symbols represent the elements and
  subscripts give the number of atoms of that
  element in the compound

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Mixtures

• Composed of two or more pure substances
• Each component retains its properties
• Can use those properties to separate components
• Homogenous- substances evenly distributed
• Solution, alloy
• Heterogeneous- not evenly distributed
• Suspension, colloid

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