Exam1_Yellow_key_S08 - C H M l 3 l 2 ; E x a n r # l P a g...

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Unformatted text preview: C H M l 3 l 2 ; E x a n r # l P a g e 2 o f l 0 February 5,2008 CodeNarne CHM l3l2: General Chemistry 2, Spring 2008 Exam #1, February 5, 2008 ls Codename (print) \etro,l Potentiallv Usef ul Information Avogaclro's number = 6.022 x l02l R = 0.0821 L atrn mol-l K-l = 8.314 J mol-t K-l DO NOT WRITE ]N THESE BLANKS Problems I thru 26: multiple choice: . no partial credit . put answers on scantron sheet . work can be put on blank sheets provided Problerns 27 thru 29: short answer: . show all work to get full or partial credit Points: I thru 24. (78\ 2s. (8) 26. (8) 27. (6) TOTAL (100) C H M 1 3 1 2 : E x a m # l Page 3 of 10 February 5,2008 CodeName l. (3 pts) Which of the following statements is incorrect? a. the solubility of gases increases with pressure according to Henry's Law. / b.)the solubilityof ionicsubstances(salts)alwaysincreaseswithincreasingtemperature. \-/ c. the solubility of gases in rvater decreases with increasing tenrperature. d. polar substances are likely to be more soluble in polar solvents. e. hydrocarbons (nonpolar compounds) are generally insoluble in water. 2. (4 pts) What is the expected freezing point of an aqueous solution that contains 25.0 g of fructose (a molecule with nrolecular mass = 180.2 g mol 'l in 250.0 g of HrO (K, for water = 1 . 8 6 ' C k g m o l r ) . / _ \ a. -0. l0 "C b. 0. l0 "C c. -0. 186 'C d. 0. 186 "C ( e.) -1.03 "C \_/ 3, (3 pts) Which one of the following substances will have hydrogen bonding as one of its i ntermolecular forces? H O F H O till- A A r ( r ,_l_!_,. o tl t l a. H-----C-H bll H H I c . H T1 I , , . { n--------{,-r- I e . H ,_l_l_, ( d . ) 4. (3 pts) A solid has a high melting point, great hardness, poor electrical conduction. and the particles at the lattice points are connected by covalent bonds. This is a(n): a. ionic solid b. molecular solid c. metallic solid / d.\ovalerrt network solid \ , i-Tl metallic and covalent network solid 5. (3 pts) Which one of the following exhibits dipole-dipole interactions between molecules?...
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This note was uploaded on 04/18/2008 for the course CHEM 1312 taught by Professor Sibert during the Spring '08 term at University of Texas at Dallas, Richardson.

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Exam1_Yellow_key_S08 - C H M l 3 l 2 ; E x a n r # l P a g...

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