lecture 9-1 - Li Be B C N O F Ne Na K Rb Cs increasing size...

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How is the Lattice Energy Defined? Na + (g) + Cl - (g) -> NaCl(g) Δ H 0 = lattice energy The lattice energy of an ionic compound is the energy associated with forming a crystalline lattice of the compound from the gaseous ions.
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The Scientists Max Born Fritz Haber The Problem To come to the peak you make a detour
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The Detour in the Chemistry 1) formation of a gaseous sodium from solid sodium. Na(s) -> Na(g) sublimation 2) formation of a chlorine atom from a chlorine molecule. ½ Cl 2 (g) -> Cl(g) dissociation 3) addition of an electron to gaseous sodium. Na(g) -> Na + (g) + e- ionization 4) addition of an electron to gaseous chlorine. Cl(g) + e- -> Cl - (g) electron capture 5) final, formation of the crystalline solid from the gaseous ions. Na + (g) + Cl - (g) -> NaCl(s)
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Born-Haber Cycle, Lattice Energies
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Definition of Energies in Terms of Enthalpies ! H o 1 symbol for enthalpy symbol for standard value symbol for step number
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Trends in the Periodic Table H He
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Unformatted text preview: Li Be B C N O F Ne Na K Rb Cs increasing size of atoms increasing size of atoms Trends in Lattice Energies, Ion Size and Ion Charge Exercise 1) Arrange the following ionic compounds in order of increasing magnitude of lattice energy CaO, KBr, KCl, SrO 2) Arrange the following in order of increasing magnitude of lattice energy LiBr, KI, and CaO 3) Which compound has the lattice energy of greatest magnitude, NaCl or MgCl 2 ? Further exercises are given in the book, pp. 359. Melting of Solid Ionic Compounds Requires enough heat to overcome the electrical forces holding the anions and cations together in a lattice Salts dissolve in Water and show Conductivity Octet Rule Maximum number of electrons to fill all boxes 2s 2p isoelectronic Ne F-O 2-N 3-isoelectronic He Li + Be 2+ B 3+ Now we are ready to prepare Lewis Structures How to assign dots, look to the periodic table duets and octets differentation between lone pairs and bonding pairs Double Bond and Triple Bond Pitfalls H O H H O H H does not obey the octet rule H O H H but this is correct...
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This note was uploaded on 09/02/2008 for the course CHEM 1B taught by Professor Schoeller during the Winter '08 term at UC Riverside.

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lecture 9-1 - Li Be B C N O F Ne Na K Rb Cs increasing size...

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