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2009 Compounds2
 

2009 Compounds2

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    2009 Compounds2 2009 Compounds2 Presentation Transcript

      • Notes: Compounds
      • CW: Counting Atoms
      • H: Chemical Compounds
    • Compounds January 15, 2009
    • Objectives
      • Define compound, molecule, chemical formula, diatomic molecule
      • Write and decipher a chemical formula
      • Atoms combine together to form most of the substances we observe in the world around us.
      • Compounds - two or more atoms chemically joined together to form a new substance with very different properties than the elements of which it is formed.
    • +
      • Sodium + Chlorine = Salt
      =
    • Molecule
      • The smallest piece of a compound is that still has all of the properties of the compound.
      • Chemical Formulas:
      • The subscripts to the right of the letters tell you HOW MANY ATOMS of each element. If there isn’t one, it means that there is one atom of that element.
      • H 2 O
      • If there is a number in front of the formula, it tells you how many MOLECULES of that substance:
        • 4H 2 O
      • This number is called the coefficient.
      • C 6 H 12 O 6
      • 3CO 2
      • Ba(NO 3 ) 2
      2Al 2 (SO 4 ) 3
    • diatomic molecule When an element consists of two identical atoms it is called DIATOMIC molecule. O 2 7 elements are always found as diatomic molecules - I odine, H ydrogen, N itrogen, B romine, O xygen, C hlorine, F luorine I H ave N o Br ight O r Cl ever F riends
    •