262 7 pts here is the lewis structure for no 3

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262 (7 pts) Here is the Lewis structure for NO 3 - . Calculate the formal charges on each of the four atoms. O O N O 5 - 0 - 1/2(8) = +1 -1 5 - 4 - 1/2(4) = 0 6 - 6 - 1/2(2) = -1 263 (8 pts) Two possible Lewis structures for ClO 2 are shown. Calculate the formal charges on each of the six atoms. (1 pt) Circle the most favorable structure for ClO 2 . Must be the structure with the lowest formal charges. 264 (2 pts) If the shape of the ClO 2 molecule shown above were drawn correctly, the O—Cl—O angle would best be described as … a. Greater than 90° b. Equal to 90° c. Less than 90° d. Greater than 109½° e. Equal to 109½° f. Less than 109½° g. Greater than 120° h. Equal to 120° i. Less than 120° j. Greater than 180° k. Equal to 180° l. Less than 180° m. Cannot be predicted Resonance Structures 265 (5 pts) Draw the three resonance structures of nitrate ion, NO 3 - .
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N O O O - N O O O - N O O O 1 pt for 1 st , 2 pts. for others. 266 (5 pts) Draw the three resonance structures of carbonate ion, CO 3 2- . (Remember the double- headed arrow.) C O O O 2 - C O O O 2 - C O O O 2 - 267 (6 pts) Draw the Lewis structures that contribute to the resonance hybrid of NO 2 (N is the central atom). 18 e - , since NO 2 - has a charge 3 pt for 1 st , 3 pts. for other. 268 (4 pts) Draw the resonance structures of SO 2 . S O O S O O 18 e - . 1 pt for 1 st , 3 pts. for other. Deviations from Idea Geometry (and some mixed questions) 269 (1 pt) In the SO 2 molecule shown above, the O—S—O angle would be… a. Greater than 120° b. Equal to 120° c. Less than 120° d. Cannot be predicted 270 (1 pt) In an actual SO 2 molecule, the indicated angle would be… a. Greater than 120° b. Equal to 120° c. Less than 120° d. Cannot be predicted S O O 271 (3 pts) Calculate the formal charge on S in the above molecule.
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f.c. = 6 – 2 – ½(6) = +1 272 (2 pts) The hybridization of that sulfur atom is ____ sp 2 _____. 273 (1 pt) In an actual SF 4 molecule, the indicated angle would be… a. Greater than 90° b. Equal to 90° c. Less than 90° d. Cannot be predicted SF F F F 274 (1 pt) In an actual NH 3 molecule, the indicated angle would be… a. Greater than 109.5° b. Equal to 109.5° c. Less than 109.5° d. Cannot be predicted N H H H 275 (9 pts) Draw the resonance Lewis structures for NO 2 - . For one of the structures, include formal charges on all atoms and the bond angle, using < and > to indicate any distortion from an idealized geometry. N O O N O O 0 0 -1 <120° 1 for resonance structures, 3 for Lewis structure, 3 for formal charges, 2 for angle with distortion. 276 ( 2 pt ) In an actual SO 2 molecule, the indicated angle would best be described as… a. Greater than 90° b. Equal to 90° c. Less than 90° d. Greater than 109½° e. Equal to 109½° f. Less than 109½° g. Greater than 120° h. Equal to 120° i. Less than 120° j. Greater than 180° k. Equal to 180° l. Less than 180° m. Cannot be predicted S O O 277 (3 pts) Calculate the formal charge on S in the above molecule. f.c. = 6 – 2 – ½(6) = +1 Lewis Acids, Bases, and Adducts 278 (5 pt) Identify the Lewis acid, Lewis base, and the complex in the following reaction: NH 3 (g) + BF 3 (g) NH 3 BF 3 (s) base acid complex -3 pts if switch acid and base 279 (3 pts) In the following reaction, identify the Lewis acid, Lewis base, and the complex.
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PF 5 + F - PF 6 Lewis acid ______ PF 5 Lewis base ______ F - the complex ______ PF 6
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