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Representing matter
Representing matter
Representing matter
Representing matter
Representing matter
Representing matter
Representing matter
Representing matter
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Representing matter

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  • 1. Representing Matter
    The fundamental unit of matter is the atom.
    Greek-”unbreakable”
    A neutral group of atoms held together by chemical bonds is called a molecule
  • 2. Matter cont.
    Elements are the simplest pure substances.
    Contain only one kind of atom.
    Each has their own set of physical and chemical properties
    Diatomic
  • 3. Matter cont.
    If a molecule has at least two different kinds of atoms present then it is a compound
  • 4. Classifying Matter
    Use the symbols of the elements
    Ag, Na, H2, NaCl, H2O, etc
    Subscripts tell how many of an atom is in the molecule
    H2O, H2SO4, CaCl2
    Coefficientstell how many of the atom/molecule
    Ag, 2Na, 3H2, 4NaCl, 5H2O, etc
  • 5. Pure Substances
    Fixed composition
    Cannot be separated into simpler substances by physical methods (physical changes)
    Can only be changed in identity and properties by chemical methods
    Properties do not vary
  • 6. Mixtures
    Variable composition
    Components retain their characteristic properties
    May be separated into pure substances by physical methods
    Mixtures of different compositions may have widely different properties
  • 7. Homogeneous Mixtures
    Homogenous mixtures look the same throughout but can be separated by physical means (dissolution, centrifuge, gravimetric filtering, etc.). Examples: milk, yogurt, solutions
  • 8. Heterogeneous Mixtures
    Heterogeneous mixtures are composed of large pieces that are easily separated by physical means (ie. density, polarity, metallic properties).

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