1. Naming and Formula Writing of Ionic Compounds
Chapter 6

2. Ion Types Anion Cation Negative ion
Formed when an atom gains electrons.
Suffix changes to –ide when formed.
Cation
Positive ion
Formed when an atom loses electrons.
An atom cannot gain protons!
Suffix does not change when formed.

3. Example Problem
Tell whether each ion is a cation or anion or neither. Then tell the number of electrons gained or lost. Lastly name the ion.
Na+
Fe3+
P3- F-
Cation 1 e- lost Sodium Ion
Cation 3 e- lost Iron Ion
Anion 3 e- gained Phosphide Ion
Anion 1 e- gained Fluoride Ion

4. Compound Conundrum CO2 NaHCO3 CH3OH NiNO3 C12H22O11 NaCl C3H7OH KI
CaCO3
H2O

5. Types of Compounds Ionic compounds Made of a metal and a nonmetal.
Very strongly bonded
High melting point
Crystalline solid
White
Smallest particle called a formula unit

6. Types of Compounds Molecular compounds Made of two or more nonmetals
Weaker bonding
Lower melting points
Generally liquids and gases
Colorless
Smallest particle called a molecule

7. Compound Induction Lesson
Find the one that are ionic, put and I by them.
Find the ones that are molecular, put an M by them.

8. How to write names of ionic compounds
Think of ionic compounds as having a first name and a last name
Example 1
Sodium Chloride
Example 2
Ammonium Sulfide
Example 3
Potassium Nitrate

9. Compound Induction Lesson
Name the ionic compounds on the induction sheet.
Silver dihydrogen phosphate
Potassium chromate
Lithium chloride
Antimony fluoride
Magnesium nitrite
Zinc phosphite

10. 2nd Column Gold carbonate Iron nitride Mercury bromate Lead dichromate
Tin bioxalate
Strontium chlorate

11. 3rd Column Aluminum thocyanate Barium hydorixde Nickel iodate
Ammonium acetate
Sodium hypochlorite

12. How to write formulas of ionic compounds.
The first thing you must do is find the charges (oxidation numbers) of the elements or polyatomic ions in the formula.
Example i 1
Example ii 2
Example iii 3

13. Group A Elements – look on the periodic table!
Elements in group IA have a +1 charge.
Elements in group IIA have a +2 charge.
Elements in group IIIA have a +3 charge.
Elements in group IVA have a +4 or -4 charge (we won’t be using these)
Elements in group VA have a -3 charge.
Elements in group VIA have a -2 charge.
Elements in group VIIA have a -1 charge.
Elements in group VIIIA have a 0 charge.

14. Group B Elements
the name will tell you or the charge will be given and the charge will always be positive.
Examples
Iron (III) Oxide, the Fe has a +3 charge
Tin (IV) Oxide, the Sn has a +4 charge
Sn2+ = +2 charge

15. Metal Charges to know!
Ag = +1
Zn = +2
Cd = +2

16. Golden Rules
The sum of the oxidation numbers (charges) in a compound must equal zero!
Add subscripts (little numbers) to elements to increase the number of them.

17. Example 1 Put together K and Cl Find the charges.
it takes one of each to total up to zero
The formula is KCl

18. Example 2 Put together Fe3+ and O Find the charges.
it takes 2 Fe and 3 O to total up to zero
The formula is Fe2O3

19. Example 3 Put together Ca and S Find the charges.
it takes one of each to total up to zero
The formula is CaS

20. Example 4 Put together Al and S Find the charges.
it takes 2 Al and 3 S to total up to zero
The formula is Al2S3

21. Example 5 Put together Ba and C2H3O2 Find the charges.
it takes 1 Ba and 2 C2H3O2 to total up to zero
The formula is Ba(C2H3O2)2

22. Example 6 Put together Ca and OH Find the charges.
it takes 1 Ca and 2 OH to total up to zero
The formula is Ca(OH)2

23. Example 7 Put together Mg and SO4 Find the charges.
it takes 1 Mg and 1 SO4 to total up to zero
The formula is MgSO4

24. Example 1 Strontium Chloride Strontium = Sr = +2
Chloride = Chlorine = Cl = -1
it would take 1 Sr and 2 Cl to total up to zero
The formula is SrCl2

25. Example 2 Strontium Chlorite Strontium = Sr = +2 Chlorite = ClO2 = -1
it would take 1 Sr and 2 ClO2 to total up to zero
The formula is Sr(ClO2)2

26. Example 3 Iron (II) Bioxalate Iron = Fe = +2 Bioxalate = HC2O4 = -1
it would take 1 Fe and 2 HC2O4 to total up to zero
The formula is Fe(HC2O4)2

27. Example 4 Aluminum Carbonate Aluminum = Al = +3 Carbonate = CO3 = -2
it would take 2 Al and 3 CO3 to total up to zero
The formula is Al2(CO3)3