1. Chapter 9: Chemical Names and Formulas
Naming and Writing Formulas for Ionic Compounds

2. Learning Targets
You will learn to name and write ionic compounds. (**different than LT sheet**)
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

3. You will learn to name and write ionic compounds.
Nomenclature
We are learning how to name and write chemical compounds and formulas.
Remember rules for writing formulas:
Compounds contain the types of atoms (element symbols) and the number of each type of atom in a formula
The number of each atom is indicated by a subscript written to the right of the element symbol (with the exception of 1)
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

4. You will learn to name and write ionic compounds.
Nomenclature
Binary ionic compound – metal and nonmetal bonded together
Metals have a positive charge (cation) and non-metals have a negative charge (anion).
Metals can be Type I or Type II cations
Type I – only one charge (groups 1, 2, and 3)
Type II – more than one charge (NOT groups 1-3, denoted by a roman numeral)
*we will not test over Type II
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

5. Polyatomic Ions
Polyatomic Ions - charged particles composed of several atoms bonded together.
Polyatomic ions containing oxygen are called oxyanions.
There are several series of polyatomic ions where there are different numbers of oxygen atoms.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

6. Compounds with polyatomic ions
Compounds with polyatomic ions are NOT binary (this should be your hint!)
We needed to memorize polyatomic ions because we cannot get their names or formulas from the periodic table!
Remember polyatomic ions are a group of many atoms and CANNOT be broken up.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

7. Rules for writing formulas for Ionic compounds
Write the symbols
Assign the charges
-KNOW YOUR ION CHARGES
-Roman numeral = charge on cation
Sum the charges to zero (a MUST for ionic compounds).
IF a subscript is needed for the polyatomic ion, put the polyatomic ion in PARENTHESES with the subscript outside of it.
We’ve been over these charges before!
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

8. Rules for naming Ionic compounds
The cation is named first and comes from its element or polyatomic ion name.
If your cation is type II, use a roman numeral after it to indicate the charge.
The anion is named second and is named by taking the root of its element name and adding –ide or from the polyatomic ion name .
Common Anions:
Hydrogen - hydride
Fluorine - fluoride
Chlorine - chloride
Bromine - bromide
Iodine - iodide
Oxygen - oxide
Sulfur - sulfide
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

9. Examples Name or write the formula for each ionic compound: CsF AlCl3
Magnesium iodide
Sodium chloride
Na2SO4
KH2PO4
Calcium hydroxide
Sodium phosphate
Answers:
Cesium fluoride
Aluminum chloride
Magnesium iodide
NaCl
Sodium sulfate
Potassium dihydrogen phosphate
Ca(OH)2
Na3PO4
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

10. Try on your own Rubidium oxide Strontium iodide K2S MgBr2 NaCN
Name or write the formula for each ionic compound:
Rb2O
SrI2
Potassium sulfide
Magnesium bromide
Sodium cyanide
Calcium hydrogen carbonate
KHSO4
NH4I
Potassium permanganate
Answers:
Rubidium oxide
Strontium iodide
K2S
MgBr2
NaCN
Ca(HCO3)2
Potassium hydrogen sulfate
Ammonium iodide
KMnO4
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

11. Type II Examples (not on test)
Name or write the formula for each ionic compound:
CuCl
Fe2O3
Lead (IV) chloride
Tin (IV) oxide
PbBr2
FeS
PbCO3
Iron (II) hydroxide
Answers:
Copper (I) chloride
Iron (III) oxide
PbCl4
SnO2
Lead (II) bromide
Iron (II) sulfide
Lead (II) carbonate
Fe(OH)2
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.

12. Type II Try on your own (not on test)
Name or write the formula for each ionic compound:
Cobalt (III) chloride
Mercury (II) oxide
Fe(NO3)3
Mn(OH)2
Cobalt (II) perchlorate
Copper (II) nitrite
Cu(NO3)2
Answers:
CoCl3
HgO
Iron (III) nitrate
Manganese (II) hydroxide
Co(ClO4)2
Cu(NO2)2
Copper (II) nitrate
You will learn to name and write ionic compounds.
You will learn the names for common polyatomic ions and how to use them in naming and writing compounds.