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Notes on Compounds and mixtures

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					                    Mixtures

   Atoms of more than one type of element
    that are physically mixed but DO NOT
    chemically bond.
   Ex: trail mix, back pack, locker
   Components maintain their original
    properties
   CAN be separated by physical means.
             Compounds


Atoms of more than one type of element
that are chemically bonded together.
Ex: water, cake, table salt
Property is often different from the
properties of the elements that combine to
form them (they become something new).
CAN NOT be separated by physical means.
        Compound or Mixture?
   Water
   Air
   Muddy water
   Ice
   Sugar water
   Sand
   Sugar salt
   Salt water
   Carbon dioxide
         Compound or Mixture?
   Its components can be separated by physical
    means
   It has properties that differ from those of its
    separate elements
   It can be formed by atoms sharing electrons
   It can be formed by negative and positive ions
    joining
   It is made up of two or more compounds
   Its components keep their own properties
   It requires a chemical change to be separated
           Types of Mixtures
   Solution – a mixture of two or more
    substances that is homogeneous at the
    molecular level; a solution consists of a
    solute and a solvent.
   Homogeneous – a mixture in which every
    sample of it has the same composition
   Heterogeneous – a mixture in which every
    sample of it might have a different
    composition.
   2 or
   more
 elements
  that are
combined
     Compound vs. Mixture Lab
   On Friday, September 7, 2007, bring to
    class an example of a compound or a
    mixture. All items (edible and non-edible)
    will be labeled for lab and identified as
    compound or mixture by students. Then,
    we will “clean up” the lab. Yum! Yum!

				
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