Mixtures and Compounds by 7ROYwz6

VIEWS: 5 PAGES: 9

									Mixtures and Compounds

  HS Physical Science
Mixture

  A mixture is a PHYSICAL combination of
   two or more kinds of matter.
  Each kind of matter in a mixture keeps
   its own chemical identities.
Heterogeneous Mixtures

    The parts are still visible.
Homogeneous Mixture

  Look the same throughout because their
   components are uniformly mixed
   together.
  Also called SOLUTIONS
  Can be either solids, liquids, or gases
  Examples are: salt water, Kool-Aid, air
HOMOGENEOUS MIXTURE   HETEROGENEOUS MIXTURE
Compounds vs. Mixtures

  Compounds are
   substances made by
   CHEMICALLY
   combining two or
   more elements
  Water is an example.
Alloys

  Mixtures of metals that are melted
   together and cooled to form a solid.
  Example: copper and zinc are melted
   together to form brass
  Alloys are often used because they can
   be harder than pure metals, have a lower
   melting point, and can be made more
   resistant to corrosion.
Law of Definite Composition
  Compounds have a definite composition of the
   elements that make them up.
  For example, water ALWAYS is made of:
   1 Oxygen and 2 hydrogen
  Hydrogen peroxide is ALWAYS made of:
   2 Oxygen and 2 hydrogen

 ** If you add or subtract an atom, it will NO
    LONGER be that compound.
Chemical Formulas

   Provides information about the composition of
    a compound, using shorthand notation
  For example, the formula for water is H2O
  The number 2 following the hydrogen is called
    a SUBSCRIPT
  The subscript is used to tell how many of that
    type of atom is in that compound.
 (Instead of writing HHO-it’s shorter top write H2O

								
To top