1441test3 - 1441 Test Three Chapters 5, 6 and 7 McMurry and...

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1441 Test Three Chapters 5, 6 and 7 McMurry and Fay Website: http://dipowell1.home.mindspring.com Chapter 7- Covalent Bonds and Molecular Sructure 1. The correct statement is: (a) water is linear (b) the molecule ClO 2 cannot be accurately described by Lewis structure consistent with the octet rule (c) the bonds in LiF have more covalent character than those in F 2 (d) all of these are false 2. How many of the following molecules or ions are linear? NH 3 , NH 4 + , HCN, CO 2 , NO 3 - (a) 0 (b) 1(c) 2 (d) 3 (e) 4 3. Which of the following species has a trigonal bipyramidal structure? (a) NH 3 (b) IF 5 (c) I 3 - (d) PCl 5 (e) none of these 4. What is the molecular structure of XeF 4 ? (a) linear (b) tetrahedral (c) square planar (d) octahedral 5. Give an example of each: Polar Covalent Compound, 100% Covalent Compound, Ionic Compound. What one factor causes the bonding type to change 6. Which contains the most polar bond: HBr, HCl, or HF? 7. As the bond order for a carbon-carbon bond increases, which one of the following decreases? (a) number of electrons between the carbon atoms (b) bond energy (c) bond length (d) number of pi bonds (e) none of these 8. Which of the following groups contain no ionic compounds? (a) HCN, NO 2 , Ca(NO 3 ) 2 (b) PCl 5 , LiBr, SF 4 (c) KOH, CCl 4 , SF 4 (d) NaH, CaF 2 , NaNH 2 (e) CHO 2 , H 2 S, NH 3 9. Using the concept of formal charge, which electron dot formula most accurately describes the bonding of CS 2 ? C S S a) S C S d) S C S b) S C S e) S C S c) See next page for corrections to these drawings.
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The correct dots did not show on the drawings. Please put the following numbers of dots around each atom starting with the atom to the far left. (a) 4,0,4 (b) 6,0,6 (c) 6,2,4 (d) 4,0,4 (e) 6,0,2 10. Which of the following molecules exhibit resonance? PF 5 , SO 2 , O 3 , SO 4 2- (a) SO 2 (b) PF 5 , SO 4 2- (c) SO 2 , O 3 (d) O 3 (e) SO 4 2- 11. Which of the following violates the octet rule: I. BF 3 II. CHBr 3 (C is central) III. Br 2 IV. XeCl 2 V. CO VI. SF 4 (a) I,II,IV (b) I,III,IV,VI (c) III,V,VI (d) I,IV,VI 12. What is H for the reaction: Br 2 + 3F 2 2BrF 3 . Bond dissociation energies are as follows: Br-Br = 192kJ/mole, F-F = 159 kJ/mole, Br-F = 197 kJ/mole (Bond energies given on page 279 in text.) Try this one: C 2 H 4 + O 2 CO 2 + H 2 O ( C-H = 413kJ, O=O = 498 kJ, C=C = 614kJ, C=O = 1070 kJ, H-O = 467 kJ ) For each of the following molecules do the following: Lewis Dot Drawing, Geometric Drawing, Molecular Geometry(name of shape), Hybridization and Polarity ( does it have a dipole moment ) H 2 O, CH 4 , NH 3 , CO 2 , XeF 4 , BCl 3 , NO, ClF 3 , SF 4 Molecular Orbital Order: σ 1s 2 σ 1s *2 σ 2s 2 σ 2s *2 π 2p 4 σ 2p 2 π 2p *4 σ * 2p 13. Which of the following molecules or ions is not paramagnetic in its ground state?
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This note was uploaded on 01/03/2011 for the course CHEM 1441 taught by Professor Tanizaki during the Spring '08 term at UT Arlington.

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1441test3 - 1441 Test Three Chapters 5, 6 and 7 McMurry and...

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