L14S07_Bonding_Lewisstru 02-16-07

L14S07_Bonding_Lewisstru 02-16-07 - Chem 1A L14:...

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Unformatted text preview: Chem 1A L14: "Chemical Bonds, Lewis Structures" The Periodic Table s d p Hayden-McNeil Specialty Products M.Kubinec,A.Pines,UCRegents f L14-1 M.Kubinec,A.Pines,UCRegents L14-2 ChemQuiz 13.3 Which of the following has the Smallest radius? radius? 1) Cl M.Kubinec,A.Pines,UCRegents 2) Ar 3) K L14-3 M.Kubinec,A.Pines,UCRegents 1 Chem 1A L14: "Chemical Bonds, Lewis Structures" The Pauling Electronegativity Values M.Kubinec,A.Pines,UCRegents L14-5 Electronegativity Zeff n - Ionic > 2.0 Na+ClPartly Ionic ~ 0.4-2.0 H+Cl0.4Covalent Cl - Cl < 0.4 Electronegativity + Na ~0.9 H ~ 2.2 Cl ~ 3.2 M.Kubinec,A.Pines,UCRegents L14-6 ChemQuiz 14.0 For which X does H2 + X2 2HX H X X H H X X H release the most energy? 1) Cl M.Kubinec,A.Pines,UCRegents 2) Br 3) I L14-7 M.Kubinec,A.Pines,UCRegents 2 Chem 1A L14: "Chemical Bonds, Lewis Structures" M.Kubinec,A.Pines,UCRegents L14-9 Summary Lewis Electron Dot Structures Valence Electrons Stable Octet H . He : . . . Li. Be . .B . . C . .N . :O . : F. :Ne : . . . : : : : : : : : : : : : : : : : : : . . . Na. Mg. .Al . .Si . . . . :S . : Cl . :Ar: P . . M.Kubinec,A.Pines,UCRegents L14-11 M.Kubinec,A.Pines,UCRegents 3 Chem 1A L14: "Chemical Bonds, Lewis Structures" ChemQuiz 14.1 Which element forms a bromide that is ~80% Br by mass? ~ atomic mass Br 80 Ca 40 K 40 Ne 20 1) Ne M.Kubinec,A.Pines,UCRegents 2) K 3) Ca L14-12 Ionization Energy, Electron Affinity X X + eX+ + e- IE X EA + e- IE (kJ mol-1) mol-1) M Na K Rb 496 419 403 -53 -48 -47 IE (kJ mol-1) mol-1) X Cl Br I 1251 1140 1008 -349 -325 -295 L14-14 EA (kJ EA (kJ M.Kubinec,A.Pines,UCRegents Ionic Bonding (Electron Transfer) e- + Coulomb + - Attraction Li. + : F. Li + + :F: : : : : : Na. + :Cl. M.Kubinec,A.Pines,UCRegents M.Kubinec,A.Pines,UCRegents 4 : : : : : : : Na + :Cl : - MgCl2 L14-15 Chem 1A L14: "Chemical Bonds, Lewis Structures" ChemQuiz 14.2 The r at which e- jumps to form an ionic bond varies. For which Chloride formation is r greatest ? e- r 1) Li M.Kubinec,A.Pines,UCRegents 2) Na 3) K L14-16 Crystal Formation M.Kubinec,A.Pines,UCRegents L14-18 Covalent Bonding (Electron Sharing) Molecular Orbitals H. + : : : : .H : : : : H:H : Cl: Cl : : : : : : : : : Cl . + . Cl : M.Kubinec,A.Pines,UCRegents Cl: H Cl: L14-19 : : : M.Kubinec,A.Pines,UCRegents 5 Chem 1A L14: "Chemical Bonds, Lewis Structures" (a) The Interaction of Two Hydrogen Atoms (b) Energy Profile as a Function of the Distance Between the Nuclei of the Hydrogen Atoms M.Kubinec,A.Pines,UCRegents L14-20 (a) The Charge Distribution in the Water Molecule. (b) The Water Molecule in an Electric Field M.Kubinec,A.Pines,UCRegents L14-21 The HCl Molecule Has a Dipole Moment M.Kubinec,A.Pines,UCRegents L14-22 M.Kubinec,A.Pines,UCRegents 6 Chem 1A L14: "Chemical Bonds, Lewis Structures" Octet Rule H H C H H H N H H Exceptions :F B F: : : : : : : :N :C : : O : : : : O N: O: :F: F .. F Xe .. : F M.Kubinec,A.Pines,UCRegents : : M.Kubinec,A.Pines,UCRegents : 1) C::O ::O H 2) C:::O: :::O : H 3) H:C:O:H : : : : : : How many bonds are needed to complete the structure of the cyanide ion?: ion?: 1) 0 M.Kubinec,A.Pines,UCRegents M.Kubinec,A.Pines,UCRegents 7 : : H .. F SF6 L14-23 ChemQuiz 14.3 Which is the correct Lewis electron dot structure of Formaldehyde? H CH2O L14-24 ChemQuiz 14.4 - C N 2) 1 3) 2 L14-26 Chem 1A L14: "Chemical Bonds, Lewis Structures" Lecture Complete M.Kubinec,A.Pines,UCRegents L14-28 M.Kubinec,A.Pines,UCRegents 8 ...
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