Exam 2 Form Code A

Exam 2 Form Code A - CHM 2045 Exam 2 (Form Code A) October...

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CHM 2045 Exam 2 (Form Code A) October 13, 2008 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), Discussion Section No. and Form Code (see above). This exam consists of 25 multiple choice questions each worth 10.0 points for a total maximum of 250 pts. Keep your exam sheet (mark your answers on it and the scantron sheet). Turn in only the scantron. Any bubbling error will count as an incorrect response . 1. Consider the following successive ionization energies (I, in kJ/mol) for an atom that tends to form an ion with the electron configuration of neon. What is the element? I 1 = 578 I 2 = 1820 I 3 = 2750 I 4 = 11600 I 5 = 14800 (1) N (2) Na (3) Mg (4) Al (5) Si 2. What is the ground-state electronic configuration of an ion that has 16 protons in its nucleus? (1) [Ar] (2) [Ne] (2) [Ne]3s 2 2p 4 (3) [Ar]3s 2 2p 4 (4) 1s 2 2s 2 2p 6 3s 2 3p 4 (5) 1s 2 2s 2 2p 6 3s 2 3p 2 3. Which of the following has the greatest lattice energy? (1) NaCl (2) KCl (3) MgCl 2 (4) Na 2 O (5) SrO 4. Given the following data, calculate the lattice energy of KCl(s). K(s) K(g) ΔH° sublimation = + 89 kJ/mol K(g) K + (g) + e- ΔH° ionization-energy = + 418 kJ/mol ½ Cl 2 (g) Cl(g) ΔH° bond-dissociation = + 122 kJ/mol Cl(g) + e- Cl ΔH° electron-affinity = – 349 kJ/mol K(s) + ½ Cl 2 (g) KCl(s) ΔH° rxn = – 437 kJ/mol (1) – 717 kJ/mol (2) – 437 kJ/mol
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Exam 2 Form Code A - CHM 2045 Exam 2 (Form Code A) October...

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