1. Slide 1 of 25 chemistry

2. © Copyright Pearson Prentice Hall Slide 2 of 25 Ionic Bonds and Ionic Compounds In many coastal countries that have warm, relatively dry climates, salt is produced by the evaporation of seawater. You will learn how cations and anions combine to form stable compounds such as sodium chloride. 7.2

3. © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Slide 3 of 25 Formation of Ionic Compounds What is the electrical charge of an ionic compound? 7.2

4. Slide 4 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Formation of Ionic Compounds Compounds composed of cations and anions are called ionic compounds. Although they are composed of ions, ionic compounds are electrically neutral. 7.2

5. Slide 5 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Formation of Ionic Compounds Aluminum metal and the nonmetal bromine react to form an ionic solid, aluminum bromide. 7.2

6. Slide 6 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Formation of Ionic Compounds Ionic Bonds The electrostatic forces that hold ions together in ionic compounds are called ionic bonds. 7.2

7. © Copyright Pearson Prentice Hall Slide 7 of 25 Ionic Bonds and Ionic Compounds > Formation of Ionic Compounds Animation 8 Take an atomic-level look at the formation of KCl.

8. Slide 8 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Formation of Ionic Compounds Formula Units A chemical formula shows the kinds and numbers of atoms in the smallest representative unit of a substance. A formula unit is the lowest whole-number ratio of ions in an ionic compound. 7.2

9. © Copyright Pearson Prentice Hall Slide 9 of 25 Ionic Bonds and Ionic Compounds > Formation of Ionic Compounds NaCl is the chemical formula for sodium chloride. 7.2

10. © Copyright Pearson Prentice Hall Slide 10 of 25 Conceptual Problem 7.2

11. © Copyright Pearson Prentice Hall Slide 11 of 25 Conceptual Problem 7.2

12. © Copyright Pearson Prentice Hall Slide 12 of 25 Conceptual Problem 7.2

13. © Copyright Pearson Prentice Hall Slide 13 of 25 Conceptual Problem 7.2

14. © Copyright Pearson Prentice Hall Slide 14 of 25 Practice Problems for Conceptual Problem 7.2 Problem Solving 7.12 Solve Problem 12 with the help of an interactive guided tutorial.

15. © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Slide 15 of 25 Properties of Ionic Compounds What are three properties of ionic compounds? 7.2

16. Slide 16 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Properties of Ionic Compounds Most ionic compounds are crystalline solids at room temperature. Ionic compounds generally have high melting points. 7.2

17. Slide 17 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Properties of Ionic Compounds The orderly arrangement of component ions produces the beauty of crystalline solids. 7.2

18. © Copyright Pearson Prentice Hall Slide 18 of 25 Ionic Bonds and Ionic Compounds > Properties of Ionic Compounds Simulation 5 Simulate the formation of ionic compounds at the atomic level.

19. Slide 19 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Properties of Ionic Compounds The coordination number of an ion is the number of ions of opposite charge that surround the ion in a crystal. In NaCl, each ion has a coordination number of 6. 7.2

20. Slide 20 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Properties of Ionic Compounds In CsCl, each ion has a coordination number of 8. In TiO 2, each Ti 4+ ion has a coordination number of 6, while each O 2- ion has a coordination number of 3. 7.2

21. Slide 21 of 25 © Copyright Pearson Prentice Hall Ionic Bonds and Ionic Compounds > Properties of Ionic Compounds Ionic compounds can conduct an electric current when melted or dissolved in water. 7.2

22. © Copyright Pearson Prentice Hall Slide 22 of 25 Section Quiz -or- Continue to: Launch: Assess students’ understanding of the concepts in Section 7.2 Section Quiz. 7.2.

23. © Copyright Pearson Prentice Hall Slide 23 of 25 1. Which chemical formula is incorrect? a.KF 2 b.CaS c.MgO d.NaBr 7.2 Section Quiz.

24. © Copyright Pearson Prentice Hall Slide 24 of 25 2. Ionic compounds can conduct an electric current a.only when melted. b.when melted or dissolved in water. c.only when dissolved in water. d.when solid or melted. 7.2 Section Quiz.

25. © Copyright Pearson Prentice Hall Slide 25 of 25 3. At room temperature, most ionic compounds are a.crystalline solids. b.liquids. c.gases. d.soft, low melting-point solids. 7.2 Section Quiz.

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