HW5 - Owlia Arria Homework 5 Due Oct 2 2007 midnight Inst...

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Owlia, Arria – Homework 5 – Due: Oct 2 2007, midnight – Inst: Vandenbout 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Which of the following pairs of ions would have the greatest coulombic attraction in a solid compound? 1. Mg 2+ , Se 2 - 2. Mg 2+ , O 2 - 3. Mg 2+ , S 2 - 002 (part 1 of 1) 10 points An element E has the electronic configuration [Ne] 3 s 2 3 p 1 . Write the formula of its com- pound with sulfate. 1. E(SO 4 ) 2 2. E 2 (SO 4 ) 3 3. E(SO 4 ) 3 4. E 2 (SO 4 ) 5. E 3 (SO 4 ) 2 6. E 3 (SO 4 ) 003 (part 1 of 1) 10 points Use electron-dot notation to demonstrate the formation of ionic compounds involving the elements Ca and I. 1. Ca + Ca + I + I + I -→ Ca 3+ +Ca 3+ + I 2 - + I 2 - + I 2 - -→ Ca 2 I 3 2. Ca + I -→ Ca 3+ + I 3 - -→ CaI 3. Ca + I + I -→ Ca 2+ + I - + I - -→ CaI 2 4. Ca + I + I + I -→ Ca 3+ + I - + I - + I - -→ Ca 2 I 3 5. Ca + Ca + Ca + I -→ Ca + + Ca + + Ca + + I 3 - -→ Ca 3 I 6. Ca + I -→ Ca + + I - -→ CaI 7. Ca + Ca + Ca + I + I -→ Ca 2+ +Ca 2+ +Ca 2+ + I 3 - + I 3 - -→ Ca 3 I 2 8. Ca + Ca + I -→ Ca + + Ca + + I 2 - -→ Ca 2 I 9. None of these 10. Ca + I -→ Ca 2+ + I 2 - -→ CaI 004 (part 1 of 1) 10 points Which of the compounds below has bonds with the most covalent character? 1. LiCl 2. CaCl 2 3. BeCl 2
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Owlia, Arria – Homework 5 – Due: Oct 2 2007, midnight – Inst: Vandenbout 2 4. MgCl 2 5. NaCl 005 (part 1 of 1) 10 points The lattice enthalpy of calcium bromide is the energy change for the reaction 1. CaBr 2 (s) Ca(g) + 2 Br(g) 2. CaBr 2 (s) Ca(g) + Br 2 (g) 3. Ca(g) + 2 Br(g) CaBr 2 (g) 4. CaBr 2 (s) Ca 2+ (g) + 2 Br - (g) 5. Ca(s) + Br 2 ( ) CaBr 2 (s) 006 (part 1 of 1) 10 points How many valence electrons are in a Si atom?
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