Midterm%201%20Version%20A

Midterm%201%20Version%20A - Midterm I Chem 1B Version A...

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Midterm I Chem 1B Version A Created: 3:13:39 PM PST Student: _________________________________________________________ 1. According to VSEPR theory, a molecule with the general formula AX 3 E 2 will have a _____ molecular shape. A. trigonal pyramidal B. trigonal bipyramidal C. trigonal planar D. T-shaped E. see-saw 2. For which of the following elements (in their normal, stable, forms) would it be correct to describe the bonding as involving "electron pooling"? A. hydrogen B. helium C. sulfur D. iodine E. aluminum 3. A molecule with the formula AX 4 E 2 uses _________ to form its bonds. A. sp hybrid orbitals B. sp 2 hybrid orbitals C. sp 3 hybrid orbitals D. sp 3 d hybrid orbitals E. sp 3 d 2 hybrid orbitals 4. What is the molecular shape of the thiocyanate anion, SCN - , as predicted by the VSEPR theory? (Carbon is the central atom.) A. linear B. bent C. angular D. trigonal E. none of these choices is correct 5. Which one of the following statements about orbital hybridization is incorrect? A. The carbon atom in CH 4 is sp 3 hybridized. B. The carbon atom in CO 2 is sp hybridized. C. The nitrogen atom in NH 3 is sp 2 hybridized. D. sp 2 hybrid orbitals are coplanar, and at 120° to each other. E. sp hybrid orbitals lie at 180° to each other. 6. Valence bond theory predicts that xenon will use _____ hybrid orbitals in XeOF 4 . A. sp B. sp 2 C. sp 3 D. sp 3 d E. sp 3 d 2 7. Which one of the following molecules does not have a dipole moment? A. CS 2 B. H 2 S
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CH 2 Cl 2 D. PH 3 E. CH 2 O 8. According to valence bond theory, the triple bond in ethyne (acetylene, C 2 H 2 ) consists of A. three σ bonds and no π bonds. B. two σ bonds and one π bond. C. one σ bond and two π bonds. D. no σ bonds and three π bonds. E. none of these choices is correct 9. Select the element whose Lewis symbol is correct. A. a. B. b. C. c. D. d. E. e. 10. The nitrosonium ion, NO + , forms a number of interesting complexes with nickel, cobalt, and iron. According to molecular orbital theory, which of the following statements about NO + is correct? A. NO + has a bond order of 2 and is paramagnetic. B. NO + has a bond order of 2 and is diamagnetic. C. NO + has a bond order of 3 and is paramagnetic. D. NO + has a bond order of 3 and is diamagnetic. E. None of these statements is correct. 11. Select the correct formula for a compound formed from barium and nitrogen. A. BaN B. BaN 2 C. Ba 2 N 3 D. Ba 2 N E. Ba 3 N 2 12. Oxygen difluoride is a powerful oxidizing and fluorinating agent. Select its Lewis structure. A. a B. b C. c D. d E. none of these choices is correct 13. In which of these substances are the atoms held together by polar covalent bonding? A.
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Midterm%201%20Version%20A - Midterm I Chem 1B Version A...

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