Chemistry. Ionic Bonds and Ionic Compounds In many coastal countries that have warm, relatively dry...

chemistrychemistry

Ionic Bonds and Ionic CompoundsIonic Bonds and Ionic Compounds In many coastal In many coastal

countries that have countries that have warm, relatively dry warm, relatively dry climates, salt is climates, salt is produced by the produced by the evaporation of evaporation of seawater. You will seawater. You will learn how cations learn how cations and anions combine and anions combine to form stable to form stable compounds such as compounds such as sodium chloride.sodium chloride.

7.2

Formation of Ionic Formation of Ionic CompoundsCompounds

Formation of Ionic CompoundsFormation of Ionic Compounds What is the electrical charge of an ionic What is the electrical charge of an ionic

compound?compound?

7.2


Compounds composed of cations Compounds composed of cations and anions are called and anions are called ionic ionic compoundscompounds..

Although they are composed of Although they are composed of ions, ionic compounds are ions, ionic compounds are electrically neutral.electrically neutral.

7.2


Aluminum Aluminum metal and the metal and the nonmetal nonmetal bromine react bromine react to form an ionic to form an ionic solid, aluminum solid, aluminum bromide.bromide.

7.2


Ionic BondsIonic Bonds The electrostatic forces that hold ions The electrostatic forces that hold ions

together in ionic compounds are together in ionic compounds are called called ionic bonds.ionic bonds.

7.2


Animation 8 Animation 8 Take an atomic-level look Take an atomic-level look at the formation of KCl.at the formation of KCl.


Formula UnitsFormula Units A A chemical formulachemical formula shows the shows the

kinds and numbers of atoms in the kinds and numbers of atoms in the smallest representative unit of a smallest representative unit of a substance.substance.

A A formula unitformula unit is the lowest is the lowest whole-number ratio of ions in an whole-number ratio of ions in an ionic compound.ionic compound.

7.2


NaClNaCl is the chemical formula for sodium is the chemical formula for sodium chloride.chloride.

7.2

Conceptual Problem Conceptual Problem 7.27.2

Conceptual Problem 7.2Conceptual Problem 7.2

for Conceptual Problem 7.2for Conceptual Problem 7.2

Problem Solving 7.12 Solve Problem 12 with the help of an interactive guided tutorial.

Properties of Ionic Properties of Ionic CompoundsCompounds

Properties of Ionic CompoundsProperties of Ionic Compounds What are three properties of ionic What are three properties of ionic

compounds?compounds?

7.2


Most ionic compounds are Most ionic compounds are crystalline solids at room crystalline solids at room temperature. temperature.

Ionic compounds generally have Ionic compounds generally have high melting points.high melting points.

7.2


The orderly arrangement of component ions The orderly arrangement of component ions produces the beauty of crystalline solids.produces the beauty of crystalline solids.

7.2


Ionic compounds can conduct an electric current when Ionic compounds can conduct an electric current when melted or dissolved in water.melted or dissolved in water.

7.2

© Copyright Pearson Prentice Hall

Slide 19 of 25

Section Quiz

-or-Continue to: Launch:

Assess students’ understanding of the concepts in Section

7.2 Section Quiz.

7.2.


Slide 20 of 25

1. Which chemical formula is incorrect?

a. KF2

b. CaS

c. MgO

d. NaBr

7.2 Section Quiz.


Slide 21 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.


Slide 22 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.

END OF SHOW

Chemistry. Ionic Bonds and Ionic Compounds In many coastal countries that have warm, relatively dry...

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