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Unformatted text preview: We'll! Attempt 1 of 5 Tllle: C56HW started: October 3, 2010 0:13 pm submitted: October 3. 2010 5:23 PM Tine spent: 00:04:51 Total sen-'2: 3/12 : 25% E Total score adjrcted by 0.0 Maxim-n possille score: 12 Collsidet two 17L samples of gas, one H1 and one 02, both at 1 am and 25°C. Accottilg to Gtaham‘s Law: A. ll2 wi eﬁme at a rate about 2 tines [aster that 02.
B. ll2 wi afﬁne at a rate about 4 tines [aster that 02. a C. H2 wi effuse at a late about 6 tillee [astet that 02.
a D. H2 wi afﬁne at a rate about 16 lines [aster that 02. E. H2 wl efﬁse at a rate equal to that oi 02. Scone: 0]] Consider three 51 llaers, ﬁxed with pressrie gauges and smal valves, each contair 4 g oi gas at 273 K. Flask A contairs H2, llaslr n contairs He, and ﬂask c contairs CH4. Compare the ﬂasks contents ii tenns of
the Charactet'nlics Eated. average molectlar kilelic energy A.FlaskA>FlaskB>Fla$kC
B.FlaskA<FlaskE<FlaskC BC.FlaskA:FlaskB:FlaskC a
D.noneof|he5e Scone: 1/] What is lite ralio of efﬁmion rates for 01 to Kr? A. 2.619 B. 0.6179 c. 1.615 a
a D. 0.3019 E. None o[ these is withir 5% of the correct answer 3‘ ore: 0/1 In an effusion expetinellt measuirg tislance as a [mction of tine. an I'lmown gas moved 3‘2““ il 60 s wlrie 02 Indet identical conditions moved 4.34 m. Calctlate the molar mass at the unmwn gas. Scote: 0/] A sample of hydrogen gas was colected over water at 36 ?c and ass mllng. 1he volrine of the conta'net was 5.50 L. mlcriate the nllllbet of moles of H2 colected. (Vapor pres-m of water is 44.5 torr at 35 ?(:) A. 0.29 mol B. 4.69 mol c. 0.27 mol a
B D. 2.35 mol E. 0.14 mol ﬂ“ ore: 0/1 1f the volune or a sample of gas is reduced at constant tempetatlle, the average velocity , the average force of an inividual coision , and the average rninber oi coisions with the wal per
second _ A. [emails the same, 'ncteases. ilcteases B. remain Ihe same, [entails lite same. iicleases a c. [emails the same, decreases, renrairs the same a 0. decreases, 'ncreases, ilcleases E. 'ncteases. itcleases. itcteases k“ ore: 0/1 1hennal decomposition of 5.0 mellic tons of linestone to line and carbon ciwride quies 9.0 x 105 k] of heat. Convert mi; enelgy to | A- 9.0 x 105] 3- 9.0 x 104 J a C- 9.011103] 0- 9.0 x 109 ] H E. "one of ﬂier-e is wiﬂlil 5% of the collect answer H ole: 0/1 E
i; A. exelciiilg by iﬂitg weights Egoilgouuaideonacoldday a C.cl'i1lti'|g a cup or hot chocolate 3 D. takitg a cold ham E. Noneofﬂlese E ore: 1/1 A 221 g alt-triun engite part at an ititial temperature of 213°C absorbs 1,566 1 of heat. what E: the lital temperature of the part (0c)?
(c of AI = 0.900 J/g-K)? Answer: 1 .00 29. 2 h” ore: 0/1 when an exoﬂlemic reacIioll E carried out il a coffee-c“) cahinelel, what statement E COII'ECt? The limo i. negative. 0. The enthalpy of the products is lower than that or the reactants. a a c. The telllpelatlle 0f the water decreases. n. The enthalpy change for the reaction is posilive. E. The leactiun am heat llolll Iile watet. E ore: 0/1 All IIIhIown Vahllle of walel al 182°C is added to 24.4 ml. of watet at 35.0“C. If ﬂle fllal lelllpetatlle E: 23.5“C, what was ﬂle lllhmwll Vohllle? (Assn-lie Iilal no heat is Insl to “De mtolllcilgs; dof watet = 1.00
WHIL) A. 5.2 ml. n. 1170 ml. again. a D. ZSIII. E. "one of ﬂiese is wiﬂil 5% of ﬁle collect answel E ore: 1/] when 10 g samples of the folowirg materials absorb 100 1 or heat, the telllpelahle ircrease irdicated is observed. Wllicll material has the largest $peciﬁc heal? A. water, 2 K a 8. wood, 6K B c. copper, 26K D. cement. 11 K E. gass. 12 K E ore: 0/1 ...
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- Fall '08