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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Do Now: Write formulas for Aluminum Fluoride Iron(II) Sulfide Manganese(V) Oxide Write names for CaO CuSe Cr2O3 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 – Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Compounds With Polyatomic Ions Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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! Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Compounds With Polyatomic Ions Write the formula for Calcium nitrate. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Compounds With Polyatomic Ions Writing Formulas for Compounds With Polyatomic Ions Example - Calcium nitrate Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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. Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

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 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

END OF 9.1 & 9.2 Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.

Compounds With Polyatomic Ions Copyright © Pearson Education, Inc., or its affiliates. All Rights Reserved.