practice_midterm

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Page 1 of 6 Print Name:_________________________ 1. How many lone pairs of electrons are found in the Lewis structure of urea, (NH 2 ) 2 CO? A) 2 B) 3 C) 6 D) 4 E) 8 2. For dinitrogen monoxide, the arrangement of the atoms is N-N-O. One possible Lewis structure contains a double bond between N and N and another double bond between N and O. For this structure, the formal charges on N, N, and O, respectively, are: A) 0, -1, +1 B) -1, +1, 0 C) 0, +1, -1 D) 0, 0, 0 E) -2, +1, +1 3. In the most plausible Lewis structure of XeOF 2 , there are A) 2 single bonds, 1 double bond, and 1 lone pair of electrons around Xe. B) 3 single bonds and 1 lone pair of electrons around Xe. C) 2 single bonds, 1 double bond, and 3 lone pair of electrons around Xe. D) 2 single bonds, 1 double bond, and 2 lone pairs of electrons around Xe. E) 3 single bonds and 2 lone pairs of electrons around Xe. 4. Which of the following species has bonds with the most ionic character? A) SiO 2 B) PCl 3 C) P 4 O 10 D) CO 2 E) NO 2 5. Use the bond enthalpies given to estimate the heat released when 1-bromobutene, CH 3 CH 2 CH=CH 2 , reacts with Br 2 to give CH 3 CH 2 CHBrCH 2 Br. Bond enthalpies (kJ·molˉ ¹) : C-H, 412; C-C, 348; C=C, 612; C-Br, 276; Br-Br, 193. A) 181 kJ·molˉ ¹ B) 317 kJ·molˉ ¹ C) 288 kJ·molˉ ¹ D) 95 kJ·molˉ ¹ E) 507 kJ·molˉ ¹ 6. What is the shape of BrO 4 ˉ?
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