compounds molecules

							                         Atoms
• The basic component of all
  matter.
• The atom is the smallest
  particle of an element that has
  all of the chemical properties
  of that element.
• Atoms consist of a nucleus of
  protons and neutrons
  surrounded by electrons.
                                    http://www.ktf-split.hr/glossary/image/atom.gif
                    Elements
• A substance
  consisting of a single
  type of atom.
• It cannot be broken
  down into different
  kinds of matter.

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                                                      xperiments/agesubject/lessons/handout
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         Combinations of Elements:
                Mixtures
• A substance consisting of
  two or more substances
  mixed together.
• Mixtures can usually be
  separated by mechanical
  means.
• Two or more substances
  mixed together in such a
  way that each remains
  unchanged.
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       Combinations of Elements:
             Compounds
• A substance formed
  from two or more
  elements, with a
  fixed ratio
  determining the
  composition.
• The elements lose
  their individual        http://www.awwu.biz
  chemical properties
  and the compound
  has new properties.
                      Molecules
• Compound of two or
  more atoms, the
  smallest unit of
  chemical
  compounds.
• The smallest particle
  of a substance that
  has all of the
  physical and
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  chemical properties
  of that substance.
                   Formulas
• The formula which

                             Glucose -
  identifies the atoms and
  the number of each kind

                             C6H12O6
  in the molecules of a
  compound.
• The number and types of
  atoms in a molecule.
         Formulas

6C6H12O6
Elements in the compound:
Carbon
Hydrogen
Oxygen
                      Formulas:
                      Subscripts

                6C6H12O6
# of atoms of each element in a molecule of the compound:
Carbon - 6
Hydrogen - 12
Oxygen - 6
      Formulas:
      Coefficients

6C6H12O6

# of molecules:
6 molecules of glucose