CHE_102_midterm_1_2005v2

CHE_102_midterm_1_2005v2 - Page 1 of 6 Print Name:_ 1. How...

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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. Which of the following would likely dissolve in benzene? A) NaC1 B) C1 2 CCC1 2 C) Na 2 CO 3 D) Ca(HCO 3 ) 2 E) H 2 O 3. 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 4. What is the shape of BrO 4 ˉ? A) tetrahedral B) trigonal bipyramidal C) seesaw D) T-shaped E) square planar 5. How many σ- and π- bonds are present in the cyanamide ion, NCNH 2 ? A) 3 and 3 B) 4 and 2 C) 4 and 0 D) 6 and 0 E) 4 and 1 6. The hybrid orbitals used by the underlined atoms in CH 3 C HCHC N , from left to right respectively, are A) sp 3
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Page 2 of 6 Print Name:_________________________ B) sp 2 and sp C) sp 2 and sp 3 D)sp 2 and sp 2 E) sp and sp 3 7. The vapor pressures of pure carbon disulfide and carbon tetrachloride are 360 and 99.8 Torr, respectively, at 296 K. What is the vapor pressure of a solution containing 50.0 g of each compound? A) 260 Torr
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This note was uploaded on 02/20/2012 for the course CHEM 102 taught by Professor Spears during the Fall '08 term at Northwestern.

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CHE_102_midterm_1_2005v2 - Page 1 of 6 Print Name:_ 1. How...

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