CH145exam2_practice_ans

CH145exam2_practice_ans - SHOW ALL WORK” CH145E— all...

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Unformatted text preview: SHOW ALL WORK” CH145E— all 2009 W—JZRACTICE esponsible f0' 'ts/deviation from ideality? (8 pts) 1. What properties of a gas a1 I ‘ ,, with emitter/ha m1? 3 . (mqu fixed: (US > ,, ngiwg oi 9 m “At; kiwi/waif) 2. Which of the following statements about an ideal gas at constant temperature is true? (6 pts) (a) the kinetic energy of gas particles is a function of intermolecular forces (b) all gas particles are all moving at the same speed to, the root—mean‘squared velocity of the gas particles is independent of temperature (1) the total kinetic energy in the system is equal to that of a heavier ideal gas at the same temperature, volume, and number of particles (6) ideal gas particles collide only with the walls of the container, not with each other 3. What about the hydrogen atom (bound to an oxygen, nitrogen, or fluorine) makes it uniquely capable of forming an exceptionally strong dipole—dipole interaction with an oxygen, nitrogen, or fluorine atom on another molecule? (8 pts) ,' 1' r ._‘ I \i he") i! KB :3, ohm ham to a MW/ WNW _ “it, Q. S EC/iflmz Chi/cw or i’vtj 4; new}: Cliftflo 4. For a given substance, which tends to be the larger thermodynamic value: the enthalpy of fusion or the enthalpy of vaporization ~ and why? (8 pts) H Um? /, LQCQUEQ @Sifiii‘f at” \s/W‘CS (in? dimmgifi’f, 13/ a?“ 5. How does increased temperature in a solution increase the solubility of a solid solute while decreasing the solubility of a gaseous solute? (8 pts) / WW? / Mm i“ him“ Elf , \i dd 3% (“A m “EQWZQ (“MES behwém Sakai Ede/Ls? L L/‘fifl‘t I wi/xiifi 'mguzaggvfl \h Q 6 1L Q75 (a £912 5X title/3 5 , 6. For the second order decomposition reaction: A 9 B, what is the half life of 200 mM reactant ‘A’ if 86.74% of its original quantity decomposes in 145.7 seconds? (16 pts) \\:-_..L_,. “>2,er W1 ./—\(\i s , hm Mica; J in “ms t \\/ i ' N \/ 1' " ‘ cpl/E,“ M v x » -» _~ (Game) loawm (Li/flQmAGOA i< : (DAM? m" s" 7. Use the following graph to answer the next 3 questions. a) For the reaction,S 9 P, which reaction path is more likely to represent the catalyzed chemical reaction? 621:) dashed line b) solid line E b) If both reaction paths (solid and dashed lines) for the reaction, S '9 are representative of their respective mechanisms, how many distinct transition states exist for each mechanism? mechanism depicted by solid line? .\ mechanism depicted by dashed line? ":35 Reaction Coordinate c) Assuming that the collision frequency factor remains constant, what is the rate enhancement of the reaction, S 9 P, when in the presence of the catalyst at 25°C? E, (a ta, W3 (3% 3% - 3w - W33 W23 ~ 3% 8. For Beer’s Law, A=£- l-C, a) identify the typical units of ‘8’ (5 pts) ‘ r ml M" “CA/W at L “M 10/“ b) identify the typical units of ‘A’ (5 pts) U witkfii‘ «t 1/4er walls" W 9. At room temperature (20°C), a quart of milk sours in about 64 hours. In a refrigerator at 3°C, the same quart of milk can be stored for three times as long before it sours. If a quart of milk is left in the sun at 40°C, how long would it take for the milk to sour? (assume the sun never sets r~ i.e. the temperature remains constant) (18 pts) » V Mt x /\/ ‘ g ': ” [fil‘x‘KE {.71 (I {33V ‘1 LAM-4*} , 1:15? a a, KW“ "‘9 " s W (2 i _/ em Q Wm m w 13-“ . > ‘ V t s a 53W.th arm/i i ...
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