Molecules

Document Sample
Molecules Powered By Docstoc
					Naming Compounds
          Combining Capacity
 We need to know how atoms ________ with
  each other in order to be able to write a _______
____________ or draw a ________ of a molecule.
 Atoms can make a specific number of
  _____________ with other atoms.
 The number of connections that an atom can
  make is called its ___________________.
 When atoms combine, it is called a _______.
  Example1: Building a Molecule
The combining capacity of Hydrogen is _.
  This means that a Hydrogen atom can make only
   ____ bond
The combining capacity of Oxygen is ___.
  This means that oxygen can make ____ bonds.
We simply _____ the numbers and write
 them as __________ on the other element
 (note that 1’s are ____ _______)

                   H2O
H          O                H
           two bonds
one bond               one bond
       H        O H
All of the atoms involved in making the
 molecule are “happy” because they are
 making the correct number of connections.
A diagram like the one above is called a
 ___________ ___________.
  Example 2: Building a Molecule

The combining capacity of Calcium is _.
  This means that Calcium can make ___ bonds.
The combining capacity of Chlorine is _.
  This means that Chlorine can make ____


Ca = 2        Cl = 1      Ca1Cl2 What is
                             wrong?
Ca1Cl2  What is wrong with this?

We ________ write the 1’s

Therefore,  ______ is the correct answer
                  Try

Silver and Bromine
-

Calcium and Iodine
-
The Criss-Cross Rule
                                 Criss-Cross Rule

     Example: Aluminum Chloride
           Step 1:                              Aluminum         Chloride
  write out name with space

                                                    3                  1
           Step 2:                             Al                 Cl
write symbols & combining capacity


           Step 3:                             Al 1               Cl 3
 criss-cross combining capcity as subsrcipts

           Step 4:                                      AlCl 3
   combine as formula unit
     (“1” is never shown)
            Criss-Cross Rule
Example: Aluminum Chloride

  Step 1:   Aluminum          Chloride


  Step 2:     Al3             Cl1
  Step 3:     Al 1            Cl 3
  Step 4:            AlCl 3
            Criss-Cross Rule
Example: Aluminum Oxide

  Step 1:   Aluminum       Oxide

  Step 2:

  Step 3:

  Step 4:
         Naming Compounds

 Rules
1) ______ combine with ________ in many
   compounds
2) Write the name of the _____ first then
   the ________
3) Change the ending of the nonmetal to
   _____
   Naming Compound Concluded
E.g. Aluminum (metal) and Oxygen
 (nonmetal)


E.g. Chorine (metal or nonmetal) and
Magnesium (metal or nonmetal)

				
DOCUMENT INFO