# Homework 2 6 Modern Chemistry Online

## Presentation on theme: "Modern Chemistry Chapter 6 Chemical Bonding"— Presentation transcript:

1 **Modern Chemistry Chapter 6 Chemical Bonding**

Sections 1-5Introduction to Chemical BondingCovalent Bonding & Molecular CompoundsIonic Bonding & Ionic CompoundsMetallic BondingMolecular GeometryChapter 6 Section 2 Covalent Bonding... pages

2 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

MoleculeMolecular compoundChemical formulaMolecular formulaBond energyElectron-dot notationLewis StructureStructural formulaSingle bondMultiple bondResonanceChapter VocabularyChapter 6 Section 2 Covalent Bonding... pages

3 **Covalent Bonding and Molecular Compounds**

Section 2Covalent Bonding and Molecular CompoundsChapter 6 Section 2 Covalent Bonding... pages

4 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

MoleculesA neutral group of atoms that are held together by covalent bondsHas all the physical and chemical properties of the compoundMay consist of two or more atoms of the same elementDiatomic elements I2 Br2 Cl2 F2 O2 N2 H2 Molecular elements S8 P4I Bring Clay For Our New House & Swimming Pool.Chapter 6 Section 2 Covalent Bonding... pages

5 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

FormulasChemical Formula – indicates the relative numbers of atoms of each kind in a chemical compound by using symbols and numeric subscriptsMolecular Formula – shows the types and number of atoms in a single moleculeChapter 6 Section 2 Covalent Bonding... pages

6 **Chemical Formula Animation**

Chapter 6 Section 2 Covalent Bonding... pages

7 **Formation of Covalent Bonds**

p. 179Chapter 6 Section 2 Covalent Bonding... pages

8 **Formation of a Covalent Bond**

Forces to considerElectrons repel each otherProtons and electrons attract each othere- to p+ attraction is greater than the e- to e- repulsionChapter 6 Section 2 Covalent Bonding... pages

9 **Formation of a Covalent Bond**

Potential Energy and StabilityHigh P.E. is related to low stabilityLow P.E. is related to high stabilityChapter 6 Section 2 Covalent Bonding... pages

10 **Bond Length & Stability**

p. 179Chapter 6 Section 2 Covalent Bonding... pages

11 **Characteristics of Covalent Bonds**

Bond Length – the distance between two bonded atoms at their minimum potential energyEnergy is released when a bond formsThe same amount of energy is required to break that bondBond Energy – the energy required to break a chemical bond and form neutral atoms.Chapter 6 Section 2 Covalent Bonding... pages

12 **Bond Energy & Length Table**

p. 182Chapter 6 Section 2 Covalent Bonding... pages

13 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Bond Length AnimationChapter 6 Section 2 Covalent Bonding... pages

14 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Bond Energy Animationp. xxChapter 6 Section 2 Covalent Bonding... pages

15 **Noble Gas Configuration**

p. 183Chapter 6 Section 2 Covalent Bonding... pages

16 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Octet RuleChemical compounds tend to form so that each atom by gaining, losing or sharing electrons has an octet of electrons in its highest energy levelChapter 6 Section 2 Covalent Bonding... pages

17 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Octet Rule ExceptionsLess than 8 electronsBoronThree valence electronsStable with only six instead of eightBerylliumTwo valence electronsStable with only four instead of eightBAlways!!BeChapter 6 Section 2 Covalent Bonding... pages

18 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Octet Rule ExceptionsExpanded valence - involves the d orbitals as well as s & pPhosphorusFive valence electronsStable with only ten instead of eightSulfurSix valence electronsStable with only twelve instead of eightPNot Always!!SChapter 6 Section 2 Covalent Bonding... pages

19 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Octet Rule AnimationChapter 6 Section 2 Covalent Bonding... pages

20 **Lewis Structures Animation**

Chapter 6 Section 2 Covalent Bonding... pages

21 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Lewis StructuresFormulas in which the symbols represent nuclei and inner shell electrons, dashes or dot-pairs between symbols represent covalent bonds and dots by one symbol represent unshared pairs.Shared pairs = a bondUnshared pairs = a lone pearChapter 6 Section 2 Covalent Bonding... pages

22 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Lone Pair AnimationChapter 6 Section 2 Covalent Bonding... pages

23 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Structural FormulaIndicates the type, number and arrangement of the atoms and the bonds but not the unshared pairsChapter 6 Section 2 Covalent Bonding... pages

24 **Structural Formula Animation**

Chapter 6 Section 2 Covalent Bonding... pages

25 **How to Draw Lewis Structures**

1. Do the math to determine the number of bonds(1 x 8) +(3 x 2) +(1 x 8)= 22 e-C H3 I_(1 x 4) +(3 x 1) +(1 x 7)= 14 e-8 e-/2 = 4Divide the total by 2 to get the number of bonds in the molecule.Subtract the “have” from the “need”.All atoms need 8 electrons to be stable,except H which only needs 2.All atoms have their valence electrons available for bonding.Chapter 6 Section 2 Covalent Bonding... pages

26 **How to Draw Lewis Structures**

2. Arrange the atoms as symetrically as possible, with a central atom.HHCIHC is the central atom if it is present.H and halogens go on the outside.Chapter 6 Section 2 Covalent Bonding... pages

27 **How to Draw Lewis Structures**

3. Connect with bonds.HHCIHIf you have too many bonds, double or triple up.Chapter 6 Section 2 Covalent Bonding... pages

28 **How to Draw Lewis Structures**

4. Add unshared pairs so that all atoms have 8e- (except H)HHCIHTry page 186 #1-4 Practice.A bond counts as two electrons.Chapter 6 Section 2 Covalent Bonding... pages

29 **Multiple Covalent Bonds**

Single bond: 2 e- are shared by 2 atomsDouble bond: 4 e- are shared by 4 atomsTriple bond: 6 e- are shared by 3 atomsOccur commonly with C, N and OSTRONG single bond SHORTSTRONGER double bond SHORTERSTRONGEST triple bond SHORTESTTable on page 187Try page 188 #1 & 2 PracticeChapter 6 Section 2 Covalent Bonding... pages

30 **Multiple Bonds Animation**

p. xxChapter 6 Section 2 Covalent Bonding... pages

31 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Resonance StructuresBonding in molecules that cannot be correctly represented by a single Lewis structure.Chapter 6 Section 2 Covalent Bonding... pages

32 **Chapter 6 Section 2 Covalent Bonding... pages 178-189**

Resonance Animationp. xxChapter 6 Section 2 Covalent Bonding... pages

33 **Lewis Structures Practice**

C2Cl4SCl2AsF5CI2Cl2BF3NO 1-CH2OIO3 1-Lewis Structures PracticeChapter 6 Section 2 Covalent Bonding... pages

34 **Section 2 Homework Chapter 6 Section 2 Worksheet**

Chapter 6 Section 2 Covalent Bonding... pages

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