chm2045 exam 3 spring 07

chm2045 exam 3 spring 07 - CHM 2045 Exam 3 (Form Code A) 10...

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CHM 2045 Exam 3 (Form Code A) 10 April 2007 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), Discussion Section No. and Form Code (see above). This exam consists of 25 multiple choice questions each worth 10.0 points for a total maximum of 250 pts. You may retain your exam sheet (mark your answers on it and the scantron sheet). Turn in only the scantron. Bubbling errors of any kind will count as an incorrect response or result in the loss of points. 1. Consider a liquid with a vapor pressure of 320. mm Hg at 20.0 o C and a vapor pressure of 540. torr at 50.0 o C. What is the normal boiling point of this liquid? (Hint: solve for Δ H o vap first ) 1) 318.2 K 2) 422.0 K 3) 383.8 K 4) 346. K 5) 357. K 5. How many sigma ( σ ) bonds and pi ( π ) bonds are in formaldehyde, H 2 CO? 1) one σ , one π 2) two σ , two π 3) three σ , one π 4) three σ , two π 5) four σ , one π 15. In which of the following molecules and ions does the central carbon atom have sp hybridization: Cl 2 CO, CH 2 Br 2 , CO 2 , and OCN - ? 1) Cl 2 CO only 2) Cl 2 CO and CH 2 Br 2 3) CH 2 Br 2 and CO 2 4) CH 2 Br 2 and OCN -1 5) CO 2 and OCN -1 24. One product of the combustion of ethylene, C 2 H 4 , is carbon dioxide. What change in hybridization of the carbon occurs in this reaction? 1) sp 3 to sp 2 2) sp 3 to sp 3) sp 3 to sp 3 d 4) sp 2 to sp 3 d 2 5) sp 2 to sp 28. Sulfur trioxide is known to be planar with all the oxygen atoms equidistant from the central sulfur atom. On the basis of these facts, which of the following statements are CORRECT? 1.
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chm2045 exam 3 spring 07 - CHM 2045 Exam 3 (Form Code A) 10...

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