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ANSWERS

1) antimony tribromide _______SbBr 3 ___ 2) hexaboron silicide ____________B 6 S____________ 3) chlorine dioxide ____________ClO 2 __________ 4) iodic acid ________________HIO 3 ______________ 5) iodine pentafluoride ________IF 5 _______________

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ANSWERS

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  1. 1) antimony tribromide _______SbBr3___ 2) hexaboronsilicide ____________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 ___tertaphosphorouspentasilicide____ 10) O2 ___oxygen__________ 11) HNO4 _____pernitric acid______ 12) Si2Br6 _____disiliconhexabromide____________ 13) SCl4 _____silicon tertachloride__________ 14) CH4 _____carbon tetrahydride___(methane)______ 15) H2SO3 ______sulfurous acid__________ 16) NF3 ________nitrogen trifluoride_____________ ANSWERS

  3. 9.3 Molecular Structure

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

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

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

  7. 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. 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. 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. 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 H 5 H C H C O H H O C H C H H General Lewis Structure Rules

  11. 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. 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. 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- + O H H N H O S O H O Polyatomic Ions

  15. H H • C2H6 • N2 • CO2 • O3 C C H H H H N N O C O Get to WorkDraw Structural Formulas

  16. O3 O O O O O O Resonance

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

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

  19. O3 • SO2 O S O O O O Second Chance

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

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

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