Chem 121 Practice Final

Chem 121 Practice Final - 1. Estimate ∆ H for the...

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Unformatted text preview: 1. Estimate ∆ H for the reaction between formaldehyde and chlorine to form phosgene and hydrogen : H 2 CO(g) + Cl 2 (g) --> Cl 2 CO(g) + H 2 (g) Using the following bond enthalpies as necessary: C–O 358 kJ/mol H–H 436 kJ/mol C= O 799 kJ/mol C–H 413 kJ/mol C–Cl 328 kJ/mol Cl-Cl 242 kJ/mol • (a) –2160 kJ • (b) –109 kJ • (c) +109 kJ • (d) –24 kJ • (e) none of the above 2. Which of the following ionic compounds would you expect to have the largest lattice energy? • (a) KCl • (b) RbBr • (c) CsI • (d) SrSe • (e) CaO 3. Which of the following molecules does not violate the octet rule? • (a) NO 2 • (b) GeF 4 • (c) TeF 4 • (d) BCl 3 • (e) XeF 4 4. Which of the following would you expect to have the shortest oxygen-oxygen bond distance? • (a) O 2- • (b) O 2 • (c) O 2 + • (d) O 2 2- 5. How many and bonds are there in C σ π 2H2? (a) 3 bonds and 1 bond σ π (b) 2 bonds and 3 bonds σ π (c) 3 bonds and 3 bonds σ π (d) 5 bonds and 0 bonds σ π (e) 3 bonds and 2 bonds σ π 6. What is the hybridization about the sulfur atom in SO 3 ? • (a) sp • (b) sp 2 • (c) sp 3 • (d) sp 3 d • (e) sp 3 d 2 7. In SO 3 how many electrons are involved in π bonding? • (a) 0 • (b) 1 • (c) 2 • (d) 3 • (e) 4 8. What is the most likely value of the C-C-C bond angle in acetone, H 3 C-CO-CH 3 (the oxygen atom is bound only to the central carbon atom)? • (a) slightly less than 120° • (b) slightly greater than 120° • (c) slightly less than 109.5° • (d) slightly greater than 109.5° • (e) 180° 9. Which of the following would you expect to have the shortest nitrogen-oxygen bond distance? (Neglect differences in electronegativities of N and O and use an MO diagram to answer this question.) • (a) NO- • (b) NO • (c) NO + • (d) NO 2- 10. Which of the following molecules is not planar (flat) ? • (a) C 2 H 4 • (b) CO 3 2- • (c) XeF 4 • (d) BF 3 • (e) NH 3 11. [ 7.5 points] Using VSEPR theory, predict the molecular geometry of BrF 5 . • (a) octahedral • (b) square pyramidal • (c) T-shaped • (d) trigonal bipyramidal • (e) none of the above 12. Using VSEPR theory, predict the molecular geometry of KrF 2 ....
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This note was uploaded on 06/01/2008 for the course CHEM 121 taught by Professor Wyzlouzil during the Spring '07 term at Ohio State.

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Chem 121 Practice Final - 1. Estimate ∆ H for the...

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