Name:&______________________________________&
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AP&Chemistry&Test:&Unit&8!&
Chapter&20,&21&and&24&
1.!
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The!structure!of!a!molecule!of!“banana!oil”!is!shown!above.!!This!organic!compound!is!an!example!of!!
(A)!!an!alcohol!
(B)!!an!amine!
(C)!!a!carboxylic!acid!
(D)!!an!ester!
(E)!!a!ketone!
H
2.!
!
H
H
C
C
C
Br
!
H
H
H
Which!of!the!following!structural!formulas!represents!an!isomer!of!the!compound!that!has!the!
structural!formula!represented!above?!
Br
(A)!
!
H
(B)!
!
H
(C)!
!
Br
(D)!
!
H
(E)!
H
H
H
H
C
C
C
H
H
H
H
!
H
H
H
C
C
C
H
Br
H
H
H
H
C
C
C
H
H
H
Br
!
H
!!
H
H
H
C
C
C
Br
H
H
H
!
H
H
H
H
C
C
C
C
Br
H
H
H
H
!
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!
3.!The!organic!compound!represented!above!is!an!example!of!!
(A) an organic acid
(B) an alcohol
(C) an ether
(D) an aldehyde
(E) a ketone
!
!
4.!!
.!.!LiHCO3(aq)!+!.!.!.!H2SO4(aq)!!!!.!.!.!Li2SO4(aq)!+!.!.!.!H2O(l)!+!.!.!.!CO2(g)!
When!the!equation!above!is!balanced!and!the!coefficients!are!reduced!to!lowest!
wholePnumber!terms,!what!is!the!coefficient!of!H2O(l)!?!
a.!
1!
b.!
2!
c.!
3!
d.!
4!
e.!
5!
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Al3+(aq)!+!3!eP!!!Al(s)!EO!=!P1.66!V!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ag+(aq)!+!eP!!!Ag(s)!E0!=!+0.80!V!
!
5.!!
According!to!the!standard!reduction!potentials!given!above,!what!is!the!standard!cell!potential!for!the!
reaction!represented!below?!
!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!3!Ag+(aq)!+!Al(s)!!!3!Ag(s)!+!Al3+(aq)!
!
a.!
P1.74!V!
b.!
P0.86!V!
c.!
+1.74!V!
d.!
+2.46!V!
e.!
+4.06!V!
!
6.!
Cu2+(aq)!+!2eP!!!Cu(s)!!
Eo!=!0.34!V!
3+
P
2+
!
Cr (aq)!+!e !!!Cr (aq)!
!
Eo!=!P!0.41!V!
According!to!the!halfPreactions!represented!above,!which!of!the!following!occurs!in!aqueous!solutions!
under!standard!conditions?!
!
(A)!
Cu2+(aq)!!
+!
Cr3+(aq)!
!!Cu(s)!
+!!
Cr2+(aq)!
!
(B)!
Cu2+(aq)!
+!
2!Cr2+(aq)!
!!Cu(s)!
+!!
2!Cr3+(aq)!
!
(C)!
Cu(s)! !
+!
2!Cr3+(aq)!
!Cu2+(aq)!! +!!
2!Cr2+(aq)!
3+
2+
!
(D)!
Cu(s)! !
+!
Cr (aq)!
!!Cu (aq)! +!!
Cr2+(aq)!
!
(E)!
2!Cu2+(aq)!
+!
Cr3+(aq)!
!!2!Cu(s)!
+!!
Cr2+(aq)!
!
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7.!
!
8.!
2!MnO4P(aq)!+!10!BrP(aq)!+!16!H+(aq)!!!2!Mn2+(aq)!+!5!Br2(aq)!+!8!H2O(l)!
How!many!electrons!are!transferred!in!the!reaction!represented!by!the!balanced!equation!above?!
(A)!
2!
(B)!
4!
(C)!
5!
(D)!
8!
(E)!
10!
An!electric!current!of!1.00!ampere!is!passed!through!an!aqueous!solution!of!Ni(NO3)2.!!How!long!will!it!
take!to!plate!out!exactly!1.00!mol!of!nickel!metal,!assuming!100!percent!current!efficiency?!
(1!faraday!=!96,500!coulombs!=!6.02!x!1023!electrons)!
(A)!
386,000!sec!
(B)!
193,000!sec!
(C)!
96,500!sec!
(D)!
48,200!sec!
(E)!
24,100!sec!
!
9.!2!H2O!+!4!MnO4P!+!3!ClO2P!!!4!MnO2!+!3!ClO4P!+!4!OHP!!
Which!species!acts!as!an!oxidizing!agent!in!the!reaction!represented!above?!
(A) H2O
(B) ClO4(C) ClO2(D) MnO2
(E) MnO4-
10.!Zn(s)!+!Cu2+!!!Zn2+!+!Cu(s)!
An!electrolytic!cell!based!on!the!reaction!represented!above!was!constructed!from!zinc!and!copper!halfPcells.!
The!observed!voltage!was!found!to!be!1.00!volt!instead!of!the!standard!cell!potential,!E°,!of!1.10!volts.!Which!
of!the!following!could!correctly!account!for!this!observation?!
(A) The copper electrode was larger than the zinc electrode.
(B) The Zn2+ electrolyte was Zn(NO3)2, while the Cu2+ electrolyte was CuSO4.
(C) The Zn2+ solution was more concentrated than the Cu2+ solution.
(D) The solutions in the half-cells had different volumes.
(E) The salt bridge contained KCl as the electrolyte.
!
11.!What!is!the!maximum!mass!of!copper!that!could!be!plated!out!by!electrolyzing!aqueous!CuCl2!for!16.0!
hours!at!a!constant!current!of!3.00!amperes?!(1!faraday!=!96,500!coulombs)!
(A) 28 grams
(B) 57 grams
(C) 64 grams
(D) 114 grams
(E) 128 grams
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!
!
Questions!12!–13!
!
(A)!
Alpha!–!particle!emission!
!
(B)!
Beta!–!particle!emission!
!
(C)!
Electron!capture!
!
(D)!
Gamma!–!ray!emission!
!
(E)!
Nuclear!fission!
!
12.!
Is!the!major!process!by!which!nuclei!lose!excess!energy!with!a!change!in!atomic!number!!
!
13.!
Accounts!for!the!transformation!of!20781Tl!into!20782Pb!!
!
!
14.!
Which!of!the!following!is!a!correctly!balanced!nuclear!reaction?!
(A)!
#$%
"#!
(B)!
#,"
"%-.
(C)!
#
1*
(D)!
#$%
"#!
#$#
"(&ℎ
+ 120/
+ $1*
+ 1(7
+ ,#*+!
#5(
1(234
,
#*+
+ 3 1(7!
+ 2 1(7!
#$"
"#!!!(correct!answer)!
,(
,(
(
(E)!
1"9
#(-: + <1; !
!
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15.!The!nuclide!245Cm!is!radioactive!and!decays!by!the!loss!of!one!beta!(βe)!particle.!The!product!nuclide!is!
(A) 245Pu
(B) 95Am
(C) 248Cm
(D) 250Cm
(E) 245Bk
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2003&B&8&
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8.!
The!decay!of!the!radioisotope!IP131!was!studied!in!a!laboratory.!!IP131!is!known!to!decay!by!beta!(P10e)!
emission.!
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!
a.!
Write!a!balanced!nuclear!equation!for!the!decay!of!IP131.!
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b.!
What!is!the!source!of!the!beta!particle!emitted!from!the!nucleus?!
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The radioactivity of a sample of I-131 was measured. The data collected are plotted on the graph below.
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c.!
Determine!the!halfPlife,!t1/2,!of!IP131!using!the!graph!above.!
d.
The data can be used to show that the decay of I-131 is a first-order reaction, as indicated on the
graph below.
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i.!
Label!the!vertical!axis!of!the!graph!above.!
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ii.!
What!are!the!units!of!the!rate!constant,!k,!for!the!decay!reaction?!
iii.!
Explain!how!the!halfPlife!of!IP131!can!be!calculated!using!the!slope!of!the!line!plotted!on!
the!graph.!
e.!
Compare!the!value!of!the!halfPlife!of!1P131!at!25!oC!to!its!value!at!50!oC.!
2007&B&3&
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3.!
!
2!H2(g)!+!O2(g)!!!2!H2O(l)!
!
In!a!hydrogenPoxygen!fuel!cell,!energy!is!produced!by!the!overall!reaction!represented!above.!
!
a.!
When!the!fuel!cell!operates!at!25oC!and!1.00!atm!for!78.0!minutes,!0.0746!mol!of!O2(g)!is!
consumed.!!Calculate!the!volume!of!H2(g)!consumed!during!the!same!time!period.!!Express!your!
answer!in!liters!measured!at!25oC!and!1.00!atm.!
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b.!
Given!that!the!fuel!cell!reaction!takes!place!in!an!acidic!medium,!
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i.!
write!the!two!half!reactions!that!occur!as!the!cell!operates,!
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ii.!
identify!the!half!reaction!that!takes!place!at!the!cathode,!and!
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iii.!
determine!the!value!of!the!standard!potential,!Eo,!of!the!cell.!
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c.!
Calculate!the!charge,!in!coulombs,!that!passes!through!the!cell!during!the!78.0!minutes!of!
operation!as!described!in!part!a.!
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2010&B&3&
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3.!
A!sample!of!ore!containing!the!mineral!tellurite,!TeO2,!was!dissolved!in!acid.!!The!resulting!solution!was!
then!reacted!with!a!solution!of!K2Cr2O7!to!form!telluric!acid,!H2TeO4.!!The!unbalanced!chemical!
equation!for!the!reaction!is!given!below.!
!
!
…!TeO2(s)!+!…!Cr2O72P(aq)!+!…!H+(aq)!!!…!H2TeO4(aq)!+!…!Cr3+(aq)!+!…!H2O(l)!
!
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a.!
Identify!the!molecule!or!ion!that!is!being!oxidized!in!the!reaction.!
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b.!
Give!the!oxidation!number!of!Cr!in!the!Cr2O72P(aq)!ion.!
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c.!
Balance!the!chemical!equation!given!above!by!writing!the!correct!lowest!whole!number!
coefficients!on!the!dotted!lines.!
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