1. Chapter 9 Chemical Names and Formulas 9.1 Naming Ions
9.2 Naming and Writing Formulas for
Ionic Compounds
9.3 Naming and Writing Formulas for
Molecular Compounds
9.4 Naming and Writing Formulas for
Acids and Bases
9.5 The Laws Governing How
Compounds Form
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2. Do Now: Name the following compounds. a) FeO b) Fe2O3 c) Cu2O d) CuO
Monatomic Ions
Do Now:
Name the following compounds.
a) FeO
b) Fe2O3
c) Cu2O
d) CuO
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3. Do Now: Name the following compounds.
Monatomic Ions
Do Now:
Name the following compounds.
a) FeO Iron (II) Oxide Ferrous Oxide
b) Fe2O3 Iron (III) Oxide Ferric Oxide
c) Cu2O Copper (I) Oxide Cuprous Oxide
d) CuO Copper (II) Oxide Cupric Oxide
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4. Metals That Form More Than One Ion
Monatomic Ions
The charge of the cation is determined from the number of electrons lost.
Fe2+ is named Iron(II)
Fe3+ is named Iron(III)
Pb+2 is named Lead (II)
Pb+4 is named Lead (IV)
Metals That Form More Than One Ion
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5. Metals That Form More Than One Ion
Monatomic Ions
Metals That Form More Than One Ion
Place a Roman numeral in parentheses after the name of the element to indicate the numerical value of the charge.
Examples:
Lead (IV) is Pb+4
Iron (II) is Fe+2
Iron(III) is Fe+3
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6. Cadmium – only forms Cd2+ Zinc – only forms Zn2+
Monatomic Ions
Exceptions
Transition metals that only form one ion do not have a Roman numeral in their name.
Silver – only forms Ag+
Cadmium – only forms Cd2+
Zinc – only forms Zn2+
Group 4A elements that form multiple ions
Tin – forms Sn2+ and Sn4+
Lead – forms Pb2+ and Pb4+
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7. Binary Ionic Compounds
Naming Binary Ionic Compounds
Identify the two elements and name the cation and anion (anion ending must be –ide).
Does the cation have more than one possible charge? If no, write the compounds name. If yes, go to #3.
When the cation has more than one possible charge, a roman numeral is needed
• If subscripts present, do reverse criss-cross
to determine cation charge
• If no subscripts, verify that anion charge
and cation charge are exact opposites.
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8. Binary Ionic Compounds
Writing Formulas for Binary Ionic Compounds
Write the symbols of the elements involved.
Determine the ionic charge for each symbol.
If the sum of the charges is zero, you are done.
If the sum of the charges does not equal zero, use the criss-cross method to add subscripts to balance the charges.
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9. Do Now: Write formulas for Aluminum Fluoride Iron(II) Sulfide
Manganese(V) Oxide
Write names for
CaO
CuSe
Cr2O3
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10. Do Now: Write formulas for Aluminum Fluoride - AlF3
Iron(II) Sulfide – FeS
Manganese(V) Oxide – Mn2O5
Write names for
CaO - Calcium Oxide
CuSe – Copper(II) Selenide
Cr2O3 – Chromium(III) Oxide
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11. Compounds With Polyatomic Ions
What do you notice about the following names and formulas?
Chemical Formula Compound Name
(NH4)2S ammonium sulfide
CoSO4 cobalt(II) sulfate
Fe(OH)3 iron(III) hydroxide
Ca3(PO4)2 calcium phosphate
NH4NO3 ammonium nitrate
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12. Polyatomic Ions
Polyatomic Ions - Composed of more than one atom, behaves as a unit, and carries a charge
Ammonium ion
(NH4+)
Nitrate ion
(NO3–)
Sulfate ion
(SO42–)
Phosphate ion
(PO43–)
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13. Compounds With Polyatomic Ions
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14. -ite indicates one less oxygen atom than –ate
Polyatomic Ions
-ite indicates one less oxygen atom than –ate
SO32−, sulfite NO2–, nitrite ClO2–, chlorite
SO42–, sulfate NO3–, nitrate ClO3–, chlorate
The charge on both ions in each pair are the same.
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15. Compounds With Polyatomic Ions
Write the formula for Calcium nitrate.
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16. Compounds With Polyatomic Ions
Writing Formulas for Compounds With Polyatomic Ions
Example - Calcium nitrate
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17. Writing Formulas for Compounds With Polyatomic Ions
Sample Problem 9.4
Writing Formulas for Compounds With Polyatomic Ions
What are the formulas for these ionic compounds?
Lithium Ethanoate
Copper(I) Sulfate
Aluminum Hydroxide
Ammonium Phosphate
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18. Writing Formulas for Compounds With Polyatomic Ions
Sample Problem 9.4
Writing Formulas for Compounds With Polyatomic Ions
What are the formulas for these ionic compounds?
Lithium Ethanoate – LiC2H3O2
Copper(I) Sulfate - Cu2SO4
Aluminum Hydroxide – Al(OH)3
Ammonium Phosphate – (NH4)3PO4
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19. Compounds With Polyatomic Ions
Writing Formulas for Compounds With Polyatomic Ions
Write the symbol (or formula) for the cation followed by the symbol (or formula) for the anion.
If the charges cancel, you are done.
If the charges do not cancel, add subscripts as needed to balance the charges.
NOTE – Put the polyatomic ion in parentheses and place the subscript outside. Ex – Ca(OH)2
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20. Compounds With Polyatomic Ions
Naming Compounds With Polyatomic Ions
Identify and name the cation and polyatomic ion
If the cation only has one possible charge, write the formula.
If the cation has more than one possible charge, identify the charge of the cation.
If subscripts present, reverse criss-cross
If no subscripts, determine the charge of the polyatomic ion and the cation is the opposite
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21. Compounds With Polyatomic Ions
Naming Compounds With Polyatomic Ions
NaClO is used as a disinfectant for swimming pools and as a bleach.
Na ClO–
Sodium ion Hypochlorite ion
The name for NaClO is sodium hypochlorite.
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22. Naming Compounds With Polyatomic Ions
Sample Problem 9.5
Naming Compounds With Polyatomic Ions
Name the following ionic compounds.
BaSO4
Al(NO2)3
(NH4)2S
CaSO3
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23. Naming Compounds With Polyatomic Ions
Sample Problem 9.5
Naming Compounds With Polyatomic Ions
Name the following ionic compounds.
BaSO4 – Barium Sulfate
Al(NO2)3 – Aluminum Nitrite
(NH4)2S – Ammonium Sulfide
CaSO3 – Calcium Sulfite
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24. END OF 9.1 & 9.2
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