Slide 1 of 29 chemistry. © Copyright Pearson Prentice Hall Slide 2 of 29 Naming and Writing...

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chemistry

© Copyright Pearson Prentice Hall

Slide 2 of 29

Naming and Writing Formulas for Ionic Compounds

A recipe is a formula for the sauce—a complete list of ingredients and their proportions. Chemistry also uses formulas. Once you know the rules, you can write the formula for any chemical compound.

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>Naming and Writing Formulas for Ionic Compounds

Binary Ionic Compounds


How are the names of binary ionic compounds determined?

How do you write the formulas for binary ionic compounds?

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These masks are made of an ionic compound with the common name gypsum. This name does not tell you anything about the chemical composition of the compound, though.

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Naming Binary Ionic Compounds

A binary compound is composed of two elements and can be either ionic or molecular.

To name any binary ionic compound, place the cation name first, followed by the anion name.

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Tin(II) sulfide, or SnF2, is added to toothpastes to prevent cavities.

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Tin(IV) sulfide, or SnS22,, is used in glazes for porcelain fixtures and dishes.

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Hematite, a common ore of iron, contains iron (III) oxide. The balanced formula is Fe2O3.

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Writing Formulas for Binary Ionic Compounds

Write the symbol of the cation and then the anion. Add whatever subscripts are needed to balance the charges.

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Simulation 9

Simulation 9 Simulate combining ions and deriving the chemical formulas for several ionic compounds.


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Conceptual Problem 9.2

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Practice Problems

Sample Problems For Conceptual Problem 9.2

Problem Solving 9.11 Solve Problem 11 with the help of an interactive guided tutorial.

for Conceptual Problem 9.2


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Compounds With Polyatomic Ions

Compounds with Polyatomic Ions

How do you write the formulas and names of compounds containing polyatomic ions?

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Write the symbol for the cation followed by the formula for the polyatomic ion and balance the charges.

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For example, calcium nitrate is composed of a calcium cation (Ca2+) and a polyatomic nitrate anion (NO3–).

In calcium nitrate, two nitrate anions, each with a 1– charge, are needed to balance the 2+ charge of each calcium cation. The formula for calcium nitrate is Ca(NO3)2.

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Oysters produce calcium carbonate to form their shells and sometimes pearls.

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Lead(II)sulfate is an important component of an automobile battery.

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Practice Problems

Practice Problems For Conceptual Problem 9.3

Problem-Solving 9.12 Solve Problem 12 with the help of an interactive guided tutorial.

for Conceptual Problem 9.3

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Naming Compounds with Polyatomic Ions

To name a compound containing a polyatomic ion, state the cation first and then the anion, just as you did in naming binary ionic compounds.

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Sodium hypochlorite (NaClO) is used as a disinfectant for swimming pools. The metallic cation in this compound is sodium (Na+) so the polyatomic ion must be ClO–.

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Section Quiz

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Continue to: Launch:

Assess students’ understanding of the concepts in Section 9.2.

9.2 section Quiz.


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9.2 Section Quiz

1. The correct name for CrCl3 is

a. chromium chlorine.

b. chromium(III) chloride.

c. monochromium trichloride.

d. chromium(III) trichloride.


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2. What is the correct formula for strontium nitride?

a. Sr3N2

b. SrN2

c. Sr2N3

d. Sr3N

9.2 Section Quiz


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3. Which one of the following compounds is named correctly?

a. sodium chlorite, NaClO

b. potassium nitrate, KNO2

c. sodium acetate, NaC2H3O2

d. lithium sulfate, Li2SO3

9.2 Section Quiz

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