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Unformatted text preview: November 7, 2006
Time: 50 min
Dr. Eumean CHM 33} . \,
Name ~~~~~~~~~~~~~~~~~~~~~ n «M n» 
33..__.____ ___   Total Points: 100 Equation sheet provided. R= 3.314 JK“ mor‘.
Fm 96500 Couiomb
g = 9.8 msa. L m 6.023 x 1023 1. ( 18 points) a) (10 points) The conductivity (1c) of a saturated solution of silver chioride at 25°C is
1.55 x 10“6 s cm" and that ofttie water used is 4.30 x 10 *7 s cm". In a ﬁetd of
2.00 V cm“, the velocities of Ag+ and CI” ions are 1.10 x 10’3 and 1.32 x 10'3
cm s“, respectivoiy. Calculate the Km of AgCl neglecting activity coefﬁcient ,4 ‘” 2.00 ’1' at S‘ V
[(15 ,.. 111va3 5; {Jim W ’ M, as Z ' “1 4w”) ﬁggflm[[(f‘f ) “I
/\ ‘3» “ '" w (16? who“ 5
A; ﬂ, 3 “6.1”; [SS'XtdtmgsoilS
.S 5 ,6 5 5 qS7¥!;?€”°l W3): V—Tgifl’ Mal/Lidia’s x” 522.0“?!
' km” $1" 1Q~Ych )  b) (8 points) A current of 2.00 A is aptiiied to a metal wire for 30 s. (i) (4 points) How many oiectrons pass through a given point in the wire
during this time? @g—(‘fzzJBigO—fwgoc gig“
£9, 5‘, 5(22
naqﬁqdwﬁ M4144!“ ‘ W M 75"" ... .4“ o
f/4dl‘thm’l 622)“? {Namath 3 i (ii) (4 points) Ifthe same current is passed through a cell containing
C3504 solution, how many grams Cu will be deposited at the
cathode? (Atomic mass of (311m 63.5)  . La
CA1? +«1g p9 . 0/2.)” w
IForcv/7 “WM Wf “#2:” j "1 a t f 7K .
521)“; FMM H r t...— o~°ﬁ4 j“ “.22:
v\<*
I'llI 2. (18 points)
a) (12 points) 'Z‘he viscosities reiative to pure sokvent of a fraction of polystyrene
dissoived in benzene at 20°C were: 0.10
1.59 0.01
1.05 0.050
1.28 Concentration (g poiystyrene/ 100 g solvent)
13019 From a suitabie graph, ﬁnd the intrinsic viscosity, [n], of poiystyrene. 7—! as 1 I Z I
h . I
II_IIII
IIIIII
IIII— b) (6 points) It was shown in 01383 that the veiecity (v) of a cykindrical quuid
1ayer of radius : ﬂowing through a tube of radius R and iength L is given by: w (Pp P2) (R2~r2)f4n{. where P; and P2 are the end pressures.
Show that the voiume V ﬂowing through the tube per unit time is given by: awe: 2 (Pp ?2)1rR4ISnL 4; n4 Via—i av: 1 10,
Wjﬁﬂnﬂrr’QGQM/L) In W Emmerwm’” ’9‘ 3. (28 points)
Suppoée that a proteén molecule has a radius of {0'8 m and a density of
1.15g $1116, and is in water at 20"C. At 20°C, the Viscosity of water is 1.002 x 10'3
kg 31"} s and its density is 0.997 g em'3 . a) (18 points)Assuming the moiecule has a perfectiy spherical} shape,
. caicuiate the diffusion and sedimentation coefﬁcients. r {I f" 2: £3“ ” sifsm mm 3 ikzjymo (mi
597417 51.12,)(5YK6'6‘Z‘V‘0 )(I{bbiio
:1
:cc 771;!” mm? W
gfs’f Cry M) #‘g 3 6 13(7023 f‘{ {‘0’}
.. x '0
M c if; "’“*"Q") 737/ r . 4' £736"
5 A ,D (,w 1/52) M , z,:ww><(’”flLJ / WW W . a" F 53 541912“; (x :3 3 { 33 X‘ g (5" 5‘
b) (18 points) ﬂow far wouid the moi ' ' e minute If it were 3 in an uitracennifuge, 20 cm from the axis of rotation, with a revolution speed of 20,000 rpm? Lf
x/0 3:"
7!: v: /"’é 5,
,3
M I m;n«/€,W4“"‘ “"ﬂ , g‘BK‘OW 4. (24 points) For a 'I—dimensional gas we have shown in ciass that the veiocity
distribution fimction is given by: f(u) = K exp(»mu2f2kT) (in on
Show that K m (um/21m)"; "*  up (Haifa 7:1,; Kg“ u. r L,
r~€~ K” mi Obtain by integration and expression for the foot mean square velocity of
molecuios thaz travei in the +2: direction only. ,ynu‘
"2:7 W )1 p we Avg!“
‘3: M V
24211? O i 3 i
w ”“ )a, . ﬂ “3
I zﬁt’T Ll m c) Caicuiate the probabiiity that a nitrogen moiecuie traveiing at 300K in the x~direction win have a veiocity between 99.5 and £005 :21 sd? *3 ‘1!
g , .4wa X10
“‘ /D
Z nymmﬂw
. L/ Lg"
a»/00 m5”? J 2133 “9 M
’ ,w {.0 m 5 9
I” ’1 Au
I, . .31 )(13
p‘iviooiﬂ/r / / Z ...
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This note was uploaded on 12/17/2011 for the course CHEMICAL E 304 taught by Professor Darwish during the Spring '11 term at American University of Sharjah.
 Spring '11
 darwish

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