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Chem 1A
Exam 2
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Multiplechoice.
1 .( 1 5p t s . )
(D
Circle the correct answer.
The oxidation number of I in ICl2-is:
6
c.
d.
(ii)
100points
October,12008
Dr. Somma
- 1.
+1 .
ra
TL.
T
tJ.
which speciesis the oxidizingagentin the following reaction:
* 8 HzOOl+ 5 021g1
-+ 2 MnCl2(ud+ 2KCl (uq)
* 6 HCl luqy
5H2O2fuql+2KMnOa(uq)
c.
d.
HzOz.
KIVInOa.
MnC12.
HCl.
(iii)
If the empirical formula of an organic compound is C3H6O,then which mass cannot be the
molar massfor this compound?
q
b
c.
(iv)
Which of the following compoundsis a nonelectrolye?
a.
A
\c.,
d.
(v)
58 g/mol.
116g/mol.
174 glmol'
26|glmol.
cH3cooH.
NaOH.
cH3cH2oH.
HNO3.
The common constituentof acidicsolutionsis?
H2.
a.
h
\-*\ 9.-/
d.
oH-.
H:o*.
H2S04.
2. (10 pts.)
An organiccompoundis constitutedby C: 55.8o/o,H:7.03Yo,O :37 .2o/o.
A 1.500g samplewas vaporized andwas found to occupy 530 cm' at 100oCand740 torr. What is the
molecular formula of the compound?
a |33J
= l. 5oc a* x(c. o gq3 o{*. - L /*o\" k
9v
3 € tu| 1+..: to*r:f 3- a*w"\
\so r*L
\ *eatqet*
I
x 3+ 3. \ 5 k
x I L
AsEoffi"*?te.
/'
L : SS.€ ?L_ - +.c5"n.oe _\
*/
tz g /*,"e
L JI
'ta 3 /*d
+ fla ()2
neutralizedwith 0.250M of NaOH (aq). The volume of NaOH (aq) requfuedto neutralizethe acid
was86.9ml.
a. Assumingthat the acidis diprotic,determinethe molarmassof the acid.
b. Calculatethe molarityfor the originalunknownacid solution.
c. Whatwould the molaritybe if the 100ml unknownacid solutionaredilutedto 2.00L?
y', c w:
f sc.3
f
N*, e A (.-q-^1\
..* Z $ .D,
n,
ttl
f t , A i "+1 t-z l t \ o . O Rrta^-1
I 4)
v-nL
taot)\tCIL
""J
"(
*
. \9O ? Hr" l-
\
=
. O . O\Ogm o tn o
b) Hn.^ :
xlrooo
\Gc vt\t*
')
tt, \6- v\?va
rnL-
qr + *f^.*
= g.r03v\
\L
=D O. \Of Mx toq*L * t{ r'
?.Gr6!Dv'1L
6"+ 5X t O n
/a. (0 pts.) Use the solubility rules to predict whether the following silver salts are soluble or
insolublein water:
.
a. Agtsr
I\
|
|
| 'AS D(l.rb\e
b. Ag2S
r
c. Ag2CO3
i *:roQn-t\a
d. AgNO3
S$".r-t\e-
^:,rt^^-!,\s
e. AgOH
5. (1apts.)
The reductionof Cr2A3by Al proceedsquantitativelyon ignition of a suitablefuse as
follows:
z- v*d*: A,{-
cr2o3+ 2Al-+2cr + Alzor t,u'*d Cr2C3 +
a. How much metallic chromiumcan be madeby bringing to reactiontemperaturethe
mixtureof 5.0 kg Al and20.0kg Cr2O3?
b. Which reactantremainsat completionof the reaction?How much?
fr\ N +
\1,
\\\e \er
vv -=
I
'V\1O\E S
Wn' \^q
,
L.R
?,
rl
A 'L
= 5'ox \o
6AsEc\-nne AL i:
:r
z+
\85,nn$s*l
v'ndesCtt %* Z ,O X.\O'ei.= Bz d
(s z x z\ +(ia rs)
H,
\+,e- L, z
l5 2
q .6 l
3
l o 9- e.-\
Ct
tr
q ,6/ l-K 7^\ cf
-f
6. {7 pts.)
Identi$ the following type of reaction,write the product(s),balancethe reactionand
write the net ionic equation.
2 NaI+ Brz-+ Z- N* 9.
+ A..-
t
I
V\..L.e1
z-Iio E r- *-+
d* sp\e-ca-*c-(T ?xt^,
t
zg r + At-
7. (12 pts.) A solution of lead (II) acetateis reactedwith potassiumiodide until no further
precipitationof lead (X) iodide occurs. The precipitatelead (tr) iodide is collectedby filtration dried
andweighed. A total of 22.6 g of lead(tr) iodideis obtainedfrom 250.0ml of the original solution.
L.
Write the balancedmolecularreactionthat occursandthe correspondingnet equation.
Calculatethe molarity of lead(tI) acetatesolution.
b.
Pr- (crH=C}-eqr ?F a 1*1 ->
-)
(*\r
V\. ) -'€"'
-rr- !2
2"\
+- L
!
t6 .| J ? \
\'
(**.
-'
4
1/
?u I =re) q)< c. sao% : Lz Cs )
-2+
r'Pbf-,'t'b*iz
8. (10 pts.) A gasis confinedin a charnberat mnstant volume.Whenthe chamberis immersedin a
ice bath, the pressureof the gas is 1000.0torr. What is the Celsiustemperaturewhen the pressure
manometer
indicatesan absolutepressureof 100torr?
-D
rt
T'
\eOtorc- ><z+3,\51"<
=>T -
:-L
G
lcOo t*r''"
--'/
\
-T, ea- 3k :
-
9. (10 pts) Indicate the concentration of each ion or molecule present in the following solutions:
a. O.ZZMNaOH;
b. 0.15M cI{3oH
f [ntJ-o,tett',!bf]" o.sz n
c. 0.16M CaBrz
d. 40 mL of 0.15 M KCIO3 and 35.0 nd- of 0.22 M NazSO+(Aszumethe volumes additives)
[ k l= \ L\C:
L-
[3c-']
S
{
-J
\
=
SbHnL
C
x
+5 r"*L
o,zz. \ x = O, f,: t1
73 mL
Na,=r[*al
c oozt
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