chapter9q - Chapter 9 Models of Chemical Bonding 1 Which of...

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Chapter 9 Models of Chemical Bonding 1. Which of the following contains ionic bonding? A. CO B. SrF 2 C. Al D. OCl 2 E. HCl 5. In which of these substances are the atoms held together by polar covalent bonding? A. SrCl 2 B. CsCl C. ClF D. TiF 2 E. S 8 9. Select the element whose Lewis symbol is correct. A. a. B. b. C. c. D. d. E. e. 13. Select the compound with the highest (i.e., most negative) lattice energy. A. CaS( s ) B. BaO( s ) C. NaI( s ) D. LiBr( s ) E. MgO( s ) 15. Calculate the lattice energy of magnesium sulfide. Mg( s ) Mg( g ) Δ H ° = 148 kJ/mol Mg( g ) Mg 2+ ( g ) + 2e - Δ H ° = 2186 kJ/mol S 8 ( s ) 8S( g ) Δ H ° = 2232 kJ/mol S( g ) + 2e - S 2- ( g ) Δ H ° = 450 kJ/mol 8Mg( s ) + S 8 ( s ) 8MgS( s ) Δ H ° f = -2744 kJ/mol Mg 2+ ( g ) + S 2- ( g ) MgS( s ) Δ H ° MgS = ? A. -3406 kJ/mol B. -2720. kJ/mol C. 2720. kJ/mol D. 3406 kJ/mol E. none of these choices is correct 17. The lattice energy of MgCl 2 is the energy change for which one of the following processes? A. Mg( s ) + Cl 2 ( g ) MgCl 2 ( s ) B. Mg( g ) + 2Cl( g ) MgCl 2 ( s ) C. Mg 2+ ( s ) + 2Cl - ( g ) MgCl 2 ( g ) D. Mg 2+ ( g ) + 2Cl - ( g ) MgCl 2 ( s ) E. MgCl 2 ( aq ) MgCl 2 ( s ) 21. Arrange the following bonds in order of increasing bond strength.
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