Download Ionic Compounds Na Cl Naming of Ionic Compounds Ionic

9.2.6a_ChemicalCompounds.notebook
January 06, 2014
Ionic Compounds
When atoms transfer electrons to other
atoms when they form a compound.
Na
Cl
1 Electron is transferred
Therefore:
Sodium becomes positive (+1)
Chlorine becomes negative (-1)
Naming of Ionic Compounds
1) Name of the metallic element comes first
Sodium + Chlorine (which is metallic?)
2) Non-metallic element comes second.
Change its ending to "ide"
Chlorine
Chloride
3) Put the names together.
Sodium chloride
No capital!!!
Ionic Compounds
1
9.2.6a_ChemicalCompounds.notebook
January 06, 2014
Molecular Compounds
1) When atoms share electrons when they
form a compound.
2) Atoms stay linked regardless of changes
of state (freezing, boiling, melting).
3) Though bonding is strong the
attraction is weak between molecules.
(Therefore low melting and boiling points)
Ionic stronger bonding than Molecular
Therefore:
Ionic are usually solids*
Molecular are usually liquids or gases*
*At room temperature*
Diatomic Molecules
1) Made up of two atoms of the same element.
2) Type of Molecular Compound because the
atoms share electrons.
O2
N2
H2
2
9.2.6a_ChemicalCompounds.notebook
C
O
January 06, 2014
O
H
H
O
O
Molecular Compounds
N
Binary Compounds
N
H
H
H
O
These are all binary compounds as there are only 2 elements present in each compound
H
Binary Compounds
1) Type of Molecular Compound
2) Compound made up of two elements
CO2 = Carbon Dioxide
Naming of Binary Compounds
1) Write the entire name of the first
element
Carbon + Oxygen
Carbon
2) Change the ending of the second element
to "ide"
Oxygen
Oxide
3) Use a prefix to indicate the number of
each atom in the formula.
***mono is only used for the second element***
Mono
One Tri Three Di
Two Tetra Four 3
9.2.6a_ChemicalCompounds.notebook
January 06, 2014
Molecular Compounds
Chemical Formula
Contain the symbols of the elements and
numbers representing the number of atoms.
H2 O
Symbol for element
Number of atoms
Prefixes used for Molecular Compounds
4
9.2.6a_ChemicalCompounds.notebook
January 06, 2014
IUPAC
International Union of Pure
and Applied Chemistry
The organization of scientists responsible for setting standards in chemistry.
From a Formula ie) NaCl
Ionic Compound
Molecular Compound
1) Look for a metal ie) something on the left side of the staircase on the periodic table. **not hydrogen**
Yes ­ Ionic
No ­ Molecular
2) List the name of the first element.
2) List the name of the first element.
3) List the name of the second element.
3) List the name of the second element.
4) Change the ending of the second element to "ide".
4) Change the ending of the second element to "ide".
**Remember no capitals**
5) Put a prefix in front of both elements to indicate how many atoms there are of each.
ie) mono, di, tri, tetra.....
**Remember no captials**
From a name ie) sodium chloride or carbon dioxide
Ionic Compound
Molecular Compound
1) Look for a metal ie) something on the left side of the staircase on the periodic table. **not hydrogen**
Yes ­ Ionic
No ­ Molecular
2) List the symbol of the first element.
2) List the symbol of the first element.
3) List the symbol of the second element, (remembering it will be ending with "ide")
3) List the symbol of the second element (remembering it will be ending with "ide")
4) Look at where each element falls on the periodic table.
Alkali Metal = "+1"
Alkali Earth Metal = "+2"
Halogen = "­1"
4) Look for the prefix in front of each element ie) mono, di, tri, tetra etc.
**Can you see a trend?**
You can determine the number of atoms by the charge they have.
**Remember that if there is only one of the first element there will not be a "mono" in front**
5) Put the number associated with each prefix by the bottom right hand
corner of each element
5) Put the number of atoms by the bottom right hand corner of the element symbol.
5
9.2.6a_ChemicalCompounds.notebook
January 06, 2014
Finding the names of chemical compounds
from formulas.
KCl ->
MgS ->
CS2 ->
H2 O ->
**Is it Ionic or Molecular???**
Finding the formula of chemical compounds
from their names.
carbon tetrafluoride ->
lithium bromide ->
calcium sulphide ->
diphosphorus trioxide ->
sulphur dihydride ->
**Is it Ionic or Molecular???**
6