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Naming and Writing Formulas for Ionic Compounds

Naming and Writing Formulas for Ionic Compounds. 9.2. 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. 9.2. Binary Ionic Compounds.

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Naming and Writing Formulas for Ionic Compounds

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  1. Naming and Writing Formulas for Ionic Compounds 9.2 • 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.

  2. 9.2 Binary Ionic Compounds • Binary Ionic Compounds • How are the names of binary ionic compounds determined? • How do you write the formulas for binary ionic compounds?

  3. 9.2 Binary Ionic Compounds • 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.

  4. 9.2 Binary Ionic Compounds • 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.

  5. 9.2 Binary Ionic Compounds • Hematite, a common ore of iron, contains iron (III) oxide. The balanced formula is Fe2O3.

  6. 9.2 Binary Ionic Compounds • 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.

  7. Conceptual Problem 9.2 9.2

  8. a) CuS Cu2+ and S2- charges cancel each other out so final formula is indicative of needing 1 each of the cation and anion to form a neutral compound overall. • b) K3N Same thing here. We need 3 potassiums to cancel out the 3 negative charge of nitride.

  9. Sample Problems For Conceptual Problem 9.2 for Conceptual Problem 9.2 Problem Solving 9.11 Solve Problem 11 with the help of an interactive guided tutorial.

  10. 9.2 Compounds With Polyatomic Ions • Compounds with Polyatomic Ions • How do you write the formulas and names of compounds containing polyatomic ions?

  11. 9.2 Compounds With Polyatomic Ions • Write the symbol for the cation followed by the formula for the polyatomic ion and balance the charges.

  12. 9.2 Compounds With Polyatomic Ions • 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.

  13. Conceptual Problem 9.3 9.3

  14. Practice Problems For Conceptual Problem 9.3 for Conceptual Problem 9.3 Problem-Solving 9.12 Solve Problem 12 with the help of an interactive guided tutorial.

  15. 9.2 Compounds With Polyatomic Ions • 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.

  16. 9.2 Compounds With Polyatomic Ions • 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–.

  17. 9.2 Section Quiz • 1. The correct name for CrCl3 is • chromium chlorine. • chromium(III) chloride. • monochromium trichloride. • chromium(III) trichloride.

  18. 9.2 Section Quiz • 2. What is the correct formula for strontium nitride? • Sr3N2 • SrN2 • Sr2N3 • Sr3N

  19. 9.2 Section Quiz • 3. Which one of the following compounds is named correctly? • sodium chlorite, NaClO • potassium nitrate, KNO2 • sodium acetate, NaC2H3O2 • lithium sulfate, Li2SO3

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