jr chemistry trial 2003

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 – of 22



./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




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%




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


C

║ 3

$A%

$B%

$C%

1C║

3

C║

3

31

$D%

C 31│

│



. 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.




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




+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

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$b% valuate the success or otherwise o) the use o) ethanolpetrol )uel blen+s base+ on

recent Australian e@perience 0

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2003 – JRAHS HSC Chemistry Trial – Page of 22



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.'. ++ →

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$b% (+enti)y an instrument $other than a Jeiger counter% which coul+ be use+ to

+etect ra+iation. 1


$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





2003 – JRAHS HSC Chemistry Trial – Page * of 22



Stuent #umber

MA$6S

Question 18 (3 marks)

$a% Discuss the nee+ )or alternative, non?oil base+ sources o) petrochemicals in the )uture. 0







$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




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






$b% Describe the )low o) electrons in an operating galvanic cell in terms o) ano+e

an+ catho+e. 0








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



$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




Kuestion $continuation% MA$6S

$+% During which one?hour interval was the )ermentation most active 1



$e% Suggest a plausible cause )or the plateau on the graph 1




$)% /rite the )ormulae equation )or the )ermentation process. 1


$g% Calculate the volume o) carbon +io@i+e gas which escape+ $at S><% a)ter 6 hours o)

)ermentation. 1

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,n o! ;uestion 01

Please turn o<er2003 – JRAHS HSC Chemistry Trial – of 22



Stuent #umber

MA$6S


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



$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, .!""#

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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


$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






$c% (+enti)y one source o) error in this +etermination. @plain how this error will a))ect the

percentage sul)ate +etermine+ 1






Test continues ne=t pa:e




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

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Test continues ne=t pa:e> please turn t"e pa:e o<er




MA$6S


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.

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GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG GG

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











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


















2003 – JRAHS HSC Chemistry Trial – Page 1 of 22



MA$6S


>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


$b% /hat is the hy+rogen ion concentration o) the citric aci+ solution 1



$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+



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









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






$b% /hat is the p1 o) the .5 mol8? solution o) so+ium hy+rogen carbonate 1






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.




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

jr chemistry trial 2003

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