1. 1) antimony tribromide _______SbBr3___ 2) hexaboron silicide ____________B6S____________ 3) chlorine dioxide ____________ClO2__________ 4) iodic acid ________________HIO3______________ 5) iodine pentafluoride ________IF5_______________ 6) dinitrogen trioxide ____________N2O3______________ 7) ammonia ________________NH3_________ 8) hypophosphorous acid ______________H3PO2_____________
ANSWERS

2. 9) P4S5 ___tertaphosphorous pentasilicide____ 10) O2 ___oxygen__________ 11) HNO4 _____pernitric acid______ 12) Si2Br6 _____disilicon hexabromide____________ 13) SCl4 _____silicon tertachloride__________ 14) CH4 _____carbon tetrahydride___(methane)______ 15) H2SO3 ______sulfurous acid__________ 16) NF3 ________nitrogen trifluoride_____________
ANSWERS

3. 9.3 Molecular Structure

4. Molecular Structures Ball and Stick model Stick Model Space Filling

5. Structural Formula H2SO4 NH3 Water CH4 O H N H H O S O H H H H O H
H C H
H O H
Structural Formula

6. H2SO4
NH3 O
H O S O H H N H H
Water
CH4 H
H C H H O H
Lewis Structure

7. General Lewis Structure Rules
C4H8O2
Predict Atom locations
H is always terminal
Lowest Electronegativity is central atom H O
3.44 C
2.55
General Lewis Structure Rules

8. General Lewis Structure Rules
C4H8O2
Predict Atom locations
H is always terminal
Lowest Electronegativity is central atom
Find total number of bonding e-
H –
C –
O –
1 x 8 = 8 36
4 x 4 = 16
6 x 2 = 12
General Lewis Structure Rules

9. General Lewis Structure Rules
Predict Atom locations
H is always terminal
Lowest Electronegativity is central atom
Find total number of bonding e-
Find number of pairs
C4H8O2 36
/2=18
General Lewis Structure Rules

10. General Lewis Structure Rules
C4H8O2 18
Predict Atom locations
H is always terminal
Lowest Electronegativity is central atom
Find total number of bonding e-
Find number of pairs
Place one bond between central atom and each outer atom
-13 C H O 5
General Lewis Structure Rules

11. General Lewis Structure Rules
C4H8O2 18
Predict Atom locations
H is always terminal
Lowest Electronegativity is central atom
Find total number of bonding e-
Find number of pairs
Place one bond between central atom and each outer atom
Place remaining e- pairs around outer atoms
-13 H 5 H C H C O H H O C H C H H
General Lewis Structure Rules

12. General Lewis Structure Rules
C4H8O2
Predict Atom locations
H is always terminal
Lowest Electronegativity is central atom
Find total number of bonding e-
Find number of pairs
Place one bond between central atom and each outer atom
Place remaining e- pairs around outer atoms
Form double (triple) bonds to give central atom an octet H H C H C O H H O C H C H H
General Lewis Structure Rules

13. Polyatomic Ions 8 H – 1x4=4 N – 5x1=5 9 S – 6x1 = 6 O – 6x4 = 24 30
Cations NH4+
Anions Sulfate 8 26
H – 1x4=4
N – 5x1=5 9
S – 6x1 = 6
O – 6x4 = 24 30
(+) = -1 8
(2-) = 2 32
Polyatomic Ions

14. Cations NH4+
Anions Sulfate 8 26 2- + S O N H
Polyatomic Ions

15. Get to Work Draw Structural FormulasH
C2H6 N2
CO2 O3
N N
O C O
Get to Work Draw Structural Formulas

16. O3 O O
Resonance

17. N O Resonance Structures -
A molecule has resonance when you can draw multiple Lewis Structures NO3- - N O
Resonance Structures

18. N O Resonance Structures -
A molecule has resonance when you can draw multiple Lewis Structures NO3- - N O
Resonance Structures

19. O3
SO2 O S O
Second Chance

20. Exceptions Odd number of e- NO2 O N O Fewer than 8 e- Expanded Octet
BH3
H B H H
SF6 S F
Exceptions

21. Exceptions Fewer than 8 e- Coordinate Covalent Bond
1 atom donates both e- to share
H B H N H
Exceptions