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: Write formulas for Aluminum Fluoride Iron(II) Sulfide
Manganese(V) Oxide
Write names for
CaO
CuSe
Cr2O3
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3. 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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4. 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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5. Use () to keep the atoms together
Polyatomic Ions
Polyatomic Ions - Composed of more than one atom, behaves as a unit, and carries a charge
Use () to keep the atoms together
Do NOT change the subscripts inside the ()
Ammonium ion
(NH4)+
Nitrate ion
(NO3) –
Sulfate ion
(SO4) 2 –
Phosphate ion
(PO4)3 –
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6. Compounds With Polyatomic Ions
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7. BE CAREFUL OF –IDE, -ITE, and –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.
BE CAREFUL OF –IDE, -ITE, and –ATE!
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8. Compounds With Polyatomic Ions
Write the formula for Calcium nitrate.
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9. Compounds With Polyatomic Ions
Writing Formulas for Compounds With Polyatomic Ions
Example - Calcium nitrate
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10. 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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11. 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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12. 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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13. 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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14. 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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15. 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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16. 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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17. END OF 9.1 & 9.2
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18. Compounds With Polyatomic Ions
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