hw5 - petrosky (cep927) – H05: Bonding 1 – mccord –...

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Unformatted text preview: petrosky (cep927) – H05: Bonding 1 – mccord – (51600) 1 This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Let X be a hypothetical element. Which of the following would be largest? 1. X 2. X 2+ 3. X 2- 4. X + 5. X- 002 10.0 points If the following crystallize in the same type of structure, which has the lowest lattice energy? 1. BaS 2. SrO 3. CaO 4. SrS 5. BaO 003 10.0 points Use the expression for the Coulomb potential energy to calculate the energy for formation of 1 mole of sodium chloride ion-pairs; i.e. , the energy change for the reaction Na + (g) + Cl- (g) → Na + Cl- (g) Assume the distance between the ions in the product is 283 pm. Answer in units of kJ / mol. 004 10.0 points What is the crystal lattice energy of LiI? Sub- limation energy for Li is 155 kJ/mol and ion- ization energy for Li is 520 kJ/mol. Sublima- tion energy for I 2 is 62 kJ/mol and dissocia- tion energy for I 2 is 151 kJ/mol. The electron affinity for I is- 295 kJ/mol. The heat of formation for LiI(s) =- 271 kJ/mol. 1.- 215.5 kJ/mol 2. +726.5 kJ/mol 3. +215.5 kJ/mol 4.- 757.5 kJ/mol 005 10.0 points In general, electronegativity tends to decrease 1. from bottom to top and from left to right on the periodic table. 2. from top to bottom and from left to right on the periodic table....
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This note was uploaded on 03/09/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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hw5 - petrosky (cep927) – H05: Bonding 1 – mccord –...

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