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7/18/2019 JR Chemistry Trial 2003
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Section ITotal Marks (75)
Part A
Total marks (15)
Attempt Questions 1-15
Allow about 3 minutes !or t"is part
I#ST$%&TI'#SUse the multiple choice answer sheet on page 6.
Select the alternative A, B, C or D that best answers the question. Fill in the response oval completely.
Sample !"# $A% $B% 6 $C% & $D%'
A B ζ C D
() you thin* you have ma+e a mista*e, put a cross through the incorrect answer an+ )ill in the new answer.
A ζ B ζ C D
() you change your min+ an+ have crosse+ out what you consi+er to be the correct answer, then in+icate this by
writing the wor+ correct an+ +rawing an arrow as )ollows
correct
A ζ B ζ C D
-----------------------------------------------------------------------------------------
2003 – JRAHS HSC Chemistry Trial – Page 1 of 22
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./hich set o) aqueous solutions contain 0123!4 less than 5 7 mol 8 ?
$A% C12C331, 1Cl, 1S3"
$B% 9aCl, 912, 1C32
$C% C6136, C1:31, C12C331
$D% 9aC32, Ca$31%, 9a1C32
. /hich o) the )ollowing is a segment o) the structure o) cellulose?
$A%
H C
C
C C
C
O
OH H
H
OHH
OH
CH2OH
H
C
C
C O
C
C
H
H
CH2OH
H
OHH
H
C
C
C C
C
OH
H
H
OHH
OH
CH2OH
H
O
O
OH
$B%
H C
C
C C
C
O
OH H
H
OHH
OH
CH2OH
H
C
C
C O
C
C
H H
CH2OH
H
OHH
H
C
C
C C
C
O
H H
H
OHH
OH
CH2OH
H
O O
OH
$C%
H C
C
C C
C
O
OH H
H
OHH
OH
CH2OH
H
C
C
C O
C
H
CH2OH
H
OHH
H
C
C C
C
O
H
H
OHH
OH
CH2OH
H
O
OHC
H
C
H
O
$D%
H C
C
C C
C
O
OH H
H
OHH
OH
CH2OH
H
C
C
C O
C
H
CH2OH
H
OHH
H
C
C C
C
O
H
H
OH
OH
H
H
O
OH
C
H
C
H
O
CH2OH
2003 – JRAHS HSC Chemistry Trial – Page 2 of 22
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2. /hich o) the )ollowing galvanic cells woul+ pro+uce the greatest voltage?
$A% 2;g $s% ! Al2! Al $s% ! 2;g!
$B% Sn $s% ! <b! Sn! ! <b $s%
$C% =n $s% ! Cu! =n! ! Cu $s%
$D% Ag! ! Cu $s% Ag $s% ! Cu!
". >hese hal)?reactions show manganese gaining electron$s% an+ becoming re+uce+. (n which o) the hal)?reactions is manganese being re+uce+ to the greatest e@tent?
$A% ;n3" ! a e ;n3"
$B% ;n! ! b e ;n $s%
$C% ;n3 $s% ! "1! ! c e ;n! ! 13
$D% ;n3" ! "1! ! d e ;n3 $s% ! 13
:./hich o) the )ollowing reactions show a transuranic element being pro+uce+?
$A% n2ArBa nU
.
5
':
26
.2&
:6
.
5
2:
' ++ → +
$B% n"8rB C) .5
:&.52
.5:
:'& + → +
$C% U nU2'
'
.
5
2&
' → +
$D% n C 1e Be.5
.6
"
'" + → +
6. epairs are +one on a crac*ing unit at an oil re)inery. An analytical chemist is as*e+ to test the pro+uct
output )rom the crac*ing unit to ensure proper operation.
/hich o) the )ollowing woul+ be a vali+ test?
$A% test with a homologous catalyst$B% test with limewater
$C% test with bromine water
$D% test with methyl orange
7. /hich o) these is the structure o) styrene?
$A%
C C
H
H
H
$B%
CH2H2C
$C%
2003 – JRAHS HSC Chemistry Trial – Page 3 of 22
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C C
H
H
$D%
CH = CH2
&. /hich lower atmosphere pollutant an+ its source is incorrectly liste+
Pollutant Source
$A% oone photochemical smog
$B% sul)ur +io@i+e metal e@traction
$C% carbon mono@i+e motor cars
$D% o@i+es o) nitrogen combustion $impurities in the )uel%
'. /hich o) the )ollowing technique or instrumentation woul+ be most use)ul in qualitatively
i+enti)ying heavy metal ions in solution.
$A% Atomic Absorption Spectrometry
$B% p1 meter
$C% )lame test
$D% precipitation with suitable reagents
5. /hich is the correct (U<AC name )or citric aci+
$A% ?hy+ro@ypropane?,,2?tricarbo@ylic aci+
$B% ?hy+ro@ypropane?triethanoic aci+
$C% ,,?tricarbo@ylic aci+
$D% ethanoic aci+
. >he EsourE taste o) )ruits is o)ten cause+ by the presence o) al*anoic aci+s. /hat is the
)unctional group responsible )or the properties o) al*anoic aci+s
2003 – JRAHS HSC Chemistry Trial – Page 4 of 22
C
║ 3
$A%
$B%
$C%
1C║
3
C║
3
31
$D%
C 31│
│
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. 1igh concentrations o) S3 have been blame+ )or the increase+ mortality rates occurring in
times o) EsmogE.
/hich process woul+ 93> release S3 into the atmosphere
$A%the action o) water on superphosphate )ertiliers
$B% the combustion o) cru+e oil
$C% the o@i+ation o) sul)i+e ores in a smelter
$D% large eruption volcano emissions
2. Sul)uric aci+ can react with pyrosul)uric aci+ accor+ing to the equation
1S3"$l % ! 1S37 $l % 12S3"!$l % ! 1S37
?$l %
/hich species are acting as aci+s in this reaction
$A%1S3", 12S3"!
$B%1S37, 1S37?
$C%1S3" , 1S37?
$D%1S37, 12S3"!
". /hich type o) glassware is use+ in titration to +eliver solution X to a *nown volume
o) solution Y
$A% $C%
$B% $D%
:. /hich statement correspon+s best with DavyEs i+eas about aci+s an+ bases
$A%An aci+ is a substance that provi+es 1! ions in aqueous solution.
$B%All aci+s contain the element hy+rogen.
$C%>he presence o) o@ygen in compoun+s )orme+ )rom non?metals, causes aci+ity.
$D%An aci+ is a proton +onor.
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Stuent #umber
Section A Mark -----*15
Multiple &"oice Answer S"eet
. A B C D
. A B C D
2. A B C D
". A B C D
:. A B C D
6. A B C D
7. A B C D
&. A B C D
'. A B C D
5. A B C D
. A B C D
. A B C D
2 A B C D
". A B C D
:. A B C D
2003 – JRAHS HSC Chemistry Trial – Page 7 of 22
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+AM,S $%S, A$I&%.T%$A. /I/ S&/''.
03 &/,MIST$ T$IA. /S& ,2AM Stuent #umber
Section I (continue)
Part - 4 marks
Attempt Questions 14 -3
Allow about 1 "our an 5 minutes !or t"is part
Answer the questions in the spaces provi+e+
Show all relevant wor*ing in questions involving calculations
Question 14 $" mar*s% MA$6S
During the last twelve months, much me+ia coverage has been +evote+ to the controversial
use o) ethanol as an a++itive to petrol.
$a% @plain why ethanol is a++e+ to petrol. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG.
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG.
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG.
$b% valuate the success or otherwise o) the use o) ethanolpetrol )uel blen+s base+ on
recent Australian e@perience 0
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
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Question 17 (" mar*s% MA$6S
Biopolymers have a long history o) use $e.g. cellulose an+ rubber%, but much chemical
research is procee+ing on a new generation o) biopolymers with e@citing potential applications.
Complete the table provi+ing in)ormation about a recently +evelope+ biopolymer you have
stu+ie+.
!ame of "io#olymer
S#e$ifi$ e%&yme or orga%ism 'se(to sy%thesi&e the "io#olymer
Possi"le 'se of "io#olymer
Pro#erty of the "io#olymer )hi$h relates to it 'se
Question 1 ( marks)
$a% >he )ollowing nuclear reaction is incomplete.
e?write the entire equation provi+ing the missing numbers an+Hor symbols. 1
I 1e
2.'. ++ →
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% (+enti)y an instrument $other than a Jeiger counter% which coul+ be use+ to
+etect ra+iation. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$c% Cobalt65 is wi+ely use+ )or the irra+iation o) cancerous tumours because it is a
potent gammaemitter.
(+enti)y a problem $)or patient an+ ra+iotherapist% with its use an+ e@plain how
the problem is overcome 0
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
2003 – JRAHS HSC Chemistry Trial – Page * of 22
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Stuent #umber
MA$6S
Question 18 (3 marks)
$a% Discuss the nee+ )or alternative, non?oil base+ sources o) petrochemicals in the )uture. 0
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% >he structure shown is a )ragment o) a cellulose moleculeG.
C
- - - - HC
C O
CH - - - -
C
CH2OH
H
OHH
HOH
Draw a complete, unbro*en bor+er aroun+ the part o) the structure, which coul+ be
use+ in the )uture to ma*e oil?li*e substitutes 1
2003 – JRAHS HSC Chemistry Trial – Page 10 of 22
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MA$6S
Question 0 $" mar*s%
$a% @plain the chemistry o) the +ry cell or lea+?aci+ cell in terms o) o@i+ation an+
re+uction. Support your answer with equation +ata. 0
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% Describe the )low o) electrons in an operating galvanic cell in terms o) ano+e
an+ catho+e. 0
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
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Stuent #umber
MA$6S
Question 01 $& mar*s%
An alcoholic )ermentation is per)orme+ to quantitatively +etermine the mass loss +uring the
course o) the reaction9 An aqueous glucose mi@ture is )ermente+ in a vessel resting on the
pan o) an electronic balance, which is connecte+ to a +ata logger, set to recor+ the mass at one
hour intervals.
$a% Draw a labelle+ +iagram o) a )ermentation vessel suitable )or the purpose o) this
investigation. 1
$b% Describe storage con+itions )or the vessel, which woul+ )avour the ?hour )ermentation 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$c% >he table shows the +ownloa+e+ )ile )rom the +ata logger.
+la#se( Time ,h- .ass of /essel ,g- +la#se( Time ,h- .ass of /essel ,g-
0 173.25 7 170.40
1 173.10 8 170.35
2 172.50 9 170.30
3 171.15 10 170.25
4 170.75 11 170.25
5 170.60 12 170.25
6 170.50
<lot the table +ata on the graph gri+. 0
Question 01 continues on pa:e 10
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Kuestion $continuation% MA$6S
$+% During which one?hour interval was the )ermentation most active 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$e% Suggest a plausible cause )or the plateau on the graph 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$)% /rite the )ormulae equation )or the )ermentation process. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$g% Calculate the volume o) carbon +io@i+e gas which escape+ $at S><% a)ter 6 hours o)
)ermentation. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
,n o! ;uestion 01
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Stuent #umber
MA$6S
Question 00 $" mar*s%
CFCs an+ halons in the atmosphere have been i+enti)ie+ as the main cause o) the upper atmosphere
oone layer +epletion.
$a% (+enti)y one origin o) CFCs an+ one o) halons in the atmosphere. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% >he graph shows the mean 3ctober oone concentration over the south pole.
Describe the changes observe+ an+ e@plain how this in)ormation was obtaine+. 3
>aken from Chemistry in your Life by C. Baird and W. Gloffke, Freeman Publishin Co, .!""#
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
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MA$6S
Question 03 $" mar*s)
Ammonium sul)ate has been use+ as )ertilier. Analysis o) )ertilier is o)ten +one
gravimetrically
$a% /rite the main )ormulae equation )or the gravimetric +etermination o) sul)ate in
)ertilier . 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% Base+ on the +ata given below, calculate the percenta:e sul!ate in a )ertilier
sample. 0
mass o) )ertilier # 5.:55g
mass o) sintere+ glass crucible # 5.5: g
mass o) sintere+ glass crucible ! +rie+ precipitate # 5.72: g
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$c% (+enti)y one source o) error in this +etermination. @plain how this error will a))ect the
percentage sul)ate +etermine+ 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
Test continues ne=t pa:e
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Stuent #umber
MA$6S
Question 0 $2 mar*s%
Describe an+ assess the e))ectiveness o) metho+s use+ to puri)y an+ sanitie mass water
supplies. 3
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG..
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
Test continues ne=t pa:e> please turn t"e pa:e o<er
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MA$6S
Question 05 $" mar*s%
3utline the role o) a chemist employe+ in a name+ in+ustry or enterprise. (+enti)y the branch
o) chemistry un+erta*en by the chemist an+ +escribe a chemical principle that the chemist
uses.
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG.
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG GG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
Question 04 $ 2 mar*s%
Ammonia can be synthesie+ )rom its component gases nitrogen an+ hy+rogen as shown by the
equation
#0( g ) ? 3/0 ( g ) 0 #/3 (g)
Using 8e Chateliers principle, e@plain why the yiel+ o) pro+uct in this process is re+uce+ at higher
temperatures. (+enti)y the synthesis reaction as en+othermic or e@othermic in your answer. 3
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
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Stuent #umber
MA$6S
Question 07$6 mar*s%
Describe the proce+ure you use+ to prepare an ester in the school laboratory. (nclu+e a
+iagram an+ any relevant equations in your answer . 4
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
Test continues ne=t pa:e> please turn t"e pa:e o<er
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MA$6S
Question 0 $" mar*s%
>he p1 o) solutions o) aci+s o) the same concentrations were measure+
Aci
&oncentration
(mol .-1) p/
citric 5. .
ethanoic 5. .'
hy+rochloric 5. .5
$a% 8ist the aci+s in or+er o) strength starting )rom the wea*est. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% /hat is the hy+rogen ion concentration o) the citric aci+ solution 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$c% ;o+el the molecular nature an+ ioniation o) the aci+s in the bea*ers using the
)ollowing symbols. 1
aci+ molecule
aci+ anion
⊕ hy+rogen ion
2003 – JRAHS HSC Chemistry Trial – Page 1* of 22
hy+rochloric aci+ ethanoic aci+
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Stuent #umber
MA$6S
Question 08 $2 mar*s%
Aluminium carbi+e $Al"C2% reacts with e@cess water to pro+uce methane $C1"% an+ aluminium
hy+ro@i+e.
$a% /rite the )ormulae equation )or the reaction. 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% /hat mass o) aluminium carbi+e is require+ to pro+uce ".7' 8 o) methane at :5C an+ 55 *<a 0
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
Test continues ne=t pa:e> please turn t"e pa:e o<er
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MA$6S
Question 3 $ " mar*s%
A .5 mol8?solution o) so+ium hy+rogen carbonate was titrate+ in separate e@periments with
hy+rochloric aci+ an+ so+ium hy+ro@i+e. >he results are shown in the graph below. >he
starting point in both titration was the 5 position in+icate+ on the @?a@is.
$a% /hat is an amphiprotic species /rite balance+ ionic equations showing how the
hy+rogen carbonate ion may react as an amphiprotic species. 3
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
$b% /hat is the p1 o) the .5 mol8? solution o) so+ium hy+rogen carbonate 1
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
2003 – JRAHS HSC Chemistry Trial – Page 21 of 22
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Section II
05 marks
Attempt Question 31
Allow about 5 minutes !or t"is section9
$ns%er the &uestion in a %ritin booklet 'ro(ided
)ho% all rele(ant %orkin in &uestions in(ol(in calculations
Question 31 MA$6S
$a% /rite ano+e an+ catho+e reactions that occur +uring the electrolysis o) copper $((% chlori+e
solution an+ so+ium sul)ate solution using copper metal electro+es an+ the minimum possible
voltage.
$eaction at t"e anoe an cat"oe urin: electrol@sis o! two solutions
,lectroe &opper(II)c"lorie Soium sul!ate
Ano+e
Catho+e
$b% Catho+ic protection is one way o) protecting iron an+ iron?base+ materials )rom
corrosion.
(+enti)y two applications or techniques )or corrosion prevention utilising catho+ic
protection. Use relevant ionic equations to support your answer.
$c% Discuss one technique other than catho+ic protection which is use+ to protect a shipEs
metal hull )rom corrosion 0
$+% Discuss the nature o) the corrosion that can occur i) a lea+ gutter were naile+ to a house
using tin nails. 0
$e% $ i.%Use the in)ormation given in the )ollowing +iagrams to pre+ict the e))ect o) low temperatures at great +epths on the rate o) corrosion o) a metal. Lusti)y your pre+iction
ia:ram19 Gra'h of solubility of *! as as a function of
tem'erature.
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ia:ram 09 Gra'h of the solubility of +aCl and +*#
aainst tem'erature9
ia:ram 39 -ffect of 'ressure on the solubility of a as.
iaram taken from Chemistry by Chan, /001.
$e% $ii% 3ther than the in)ormation given in these +iagrams, i+enti)y )actors or processes that control
the concentration o) o@ygen an+ carbon +io@i+e in the ocean waters 0
$)% /hat is the best way to store partly use+ steel wool in the *itchen >he options available are
• *eeping it immerse+ in plain tap water
• *eeping it immerse+ in soapy water $a basic solution%
• *eeping it immerse+ in a carbonate+ +rin*
<lan an investigation to )in+ out the option which will result to least rusting. 7
Mour plan must inclu+e the )ollowing
• your hypothesis an+ a Nusti)ication )or this
• a brie) outline o) the proce+ure or the strategy o) the +etermination
• an i+enti)ication o) the +epen+ent, in+epen+ent an+ controlle+ variables in the
in the e@periment.
• recommen+ation on improving the reliability o) the e@periment
Mou shoul+ organie your answers in such a way as to e@plicitly a++ress the above " points
,# 'B T,ST