trial 2009 booklet 1

8/3/2019 TRIAL 2009 Booklet 1

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Wednesday 16 September 2009: 11.30 a.m

Time: 3 hours

Question Booklet 1

Examination material: Question Booklet 1 (17 pages)

Question Booklet 2 (11 pages)

Question Booklet 3 (14 pages)

Approved dictionaries, notes, and calculators may be used.

Instructions to Candidates

1. You will have 10 minutes to read the paper. You must not write in your question booklet or use a calculator duringthis reading time but you may make notes on the scribbling paper provided.

2. You will be expected to extract information such as atomic number and relative atomic mass from the periodic

table on page 3 of Question Booklet 1, which you may remove from this booklet before the examination begins.Tables showing the relative activities of metals and SI prefixes are on the back of page 4.

3. This paper consist of twelve questions, four in Question Booklet 1, four in Question Booklet 2, and four inQuestion Booklet 3:

Question Booklet 1 (Questions 1 to 4)Answerall parts of Questions 1 to 4 in the spaces provided in the question booklet.

You may write on page 17 if you need more space to finish your answers.





4. There is no need to fill all the space provided; clearly written, well-expressed answers are required. If you deletepart or all of an answer you should clearly indicate your final answer.

5. The total mark is 200. The twelve questions are of approximately equal value.6. Write your name and group in the box at the top of this page.7. At the end of the examination, place Question Booklet 2 and Question Booklet 3 inside the back cover of Question

Booklet 1.

2009 CHEMISTRY

AUSTRALIAN MATRICULATION PROGRAMME

TRIAL EXAMINATION

AUSMAT 20

QUESTION

BOOKLET1

17 Pages, 4 Questions

Name: ________________________________________________

Group: ________________________________________________


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STUDENTS DECLARATION ON THE USE OF

CALCULATORS

By signing the examination attendance roll I declare that:

my calculators have been cleared of all memory;

no external storage media are in use on these calculators.

I understand that if I do not comply with the above conditions

for the use of calculators I will:

be in breach the rules;

have my marks for the examination cancelled or amended;

be liable to such further penalty, whether by exclusion fromfuture examinations or otherwise, as SSABSA determines.


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You may refer to the following table, which shows the relative activities of number of metals, when

answering questions that involve metals:

Metal Activity

Ca most active

Na

Al

Zn

Fe

Ni

Sn least active

You may refer to the following table, which shows SI prefixes, their symbols and their values, when

answering questions that involve the conversion of units:

SI prefix Symbol Value

giga

mega

kilo

deci

centi

milli

micro

nano

pico

G

M

k

d

c

m

m

n

p

109

106

103

10-1

10-2

10-3

10-6

10-9

10-12


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QUESTION 1

(a) Fermentation process occurs when there is low amount of oxygen for organisms to survive.

(i) Before barley can be fermented, starch will be hydrolysed into disaccharides which will

be further hydrolysed to glucose.

Write a balanced chemical equation for hydrolysis of a disaccharide to glucose.

(2 marks)

(ii) Glucose will undergo fermentation into ethanol with the help of yeast.

(1) State the number of mol of ethanol produced from one mol of glucose.

_________________________________________________________ (1 mark)

(2) Explain why fermentation condition has to be anaerobic._________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________ (2 marks)

(3) Identify one adverse effect of large scale glucose fermentation to theenvironment.__________________________________________________________ (1 mark)

(iii)Glucose can be found in two structures, cyclic and linear. These two structures are at

equilibrium with each other in aqueous solution.

O

OHH

HH

OH OH

H OH

H

H2

C OH

CH 2

OH

H

OH OH

H

H OH

H H

O

OH

Cyclic glucose Linear glucose

During silver mirror test, the development of silver increases gradually when one of the

structures reacts with Tollens reagent.


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(1) Explain why only cyclic glucose reduces Tollens reagent._________________________________________________________________

_________________________________________________________________

_________________________________________________________________

________________________________________________________(2 marks)

(2) Explain, using the equilibrium equation given, why after a few minutes theproduction of silver stopped.

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

_________________________________________________________________

________________________________________________________ (3 marks)

(b) A few types of esters are used in food flavourings such as the following ester which has a

distinctive odour of apricots.

CH3 CH2 CH2 C

O

O CH2 CH2 CH2 CH2 CH3

(i) Name the ester.

_______________________________________________________________ (2 marks)

(ii) The ester can be hydrolysed into two products.

Identify the condition of hydrolysis that would produce a carboxylate ion.

________________________________________________________________ (1 mark)

(iii)Draw the molecular structure of the alcohol produced from hydrolysis of this ester.

(2 marks)

TOTAL: 16 marks


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QUESTION 2

(a) Sulindac is an anti-inflammatory drug for illnesses like rheumatoid arthritis and gout.

HOOC

CH3

S

O

CH3

Sulindac

(i) Explain why Sulindac is insoluble in water at pH below 4.5.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

___________________________________________________________ (2 marks)

(ii)When Sulindac is added to sodium carbonate solution, a gas is produced. Identify thisgas.

________________________________________________________________________

___________________________________________________________ (1 mark)

(iii)Explain why Sulindac becomes highly soluble once reacted with sodium carbonatesolution.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

_______________________________________________________________ (2 marks)

(b) Hydroxychloroquine sulphate is toxic against malaria parasites. It works by increasing the

pH of acidic area (vacuoles) that is used to make food in these parasites and consequently kill

them.

N

Cl

NH

CH3

N

OH

CH3

Hydroxychloroquine


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(i) Identify whether the amino group shown by the arrow is primary, secondary or tertiary.

________________________________________________________________ (1 mark)

(ii) Circle the functional group that would most likely react with sulphuric acid to form

hydroxychloroquine sulphate.(1 mark)

(iii)Describe how hydroxychloroquine sulphate increases the pH of acidic area (vacuoles) inthe parasites.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

______________________________________________________________ (2 marks)

Credit will be given for answers to part (c) which show clear, well-expressed ideas, and which

present accurate and relevant information in a well-organised, logical manner.

Your answer should be confined to the space provided, and should take approximately 10

minutes.

(c) The following protein section binds to oestrogen hormone and transports the hormone into

human cells.

Describe two ways how the binding occurs in normal condition by using both diagrams and

predict the effect on binding process if the condition of reaction is made acidic.

NH CH

CH 2

NH

O

CH NH CH NH CH

N

NH

NH2 O

O

CH 2

COOH

O

NH CH

CH2

OH

O

CH 2

CH 2

S

CH3

NH CH O

O O

CH2

CH2

SH

--- ---

Protein section

CH3OH

OH

Oestrogen


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___________________________________________________________________(8 marks)

TOTAL: 17 marks


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QUESTION 3

(a) Spandex is a polymer used in manufacturing garments that are stretchable like exercise

wears, ski pants and swimsuits.

N

H

O

O

N

H O

O

--- (CH2)2 O

N

O

H H

N

O

O

(CH2)2 O

N

O

H

---

Spandex

(i) State the type of polymerisation of Spandex.

________________________________________________________________ (1 mark)

(ii) State the functional group in this polymer.

________________________________________________________________ (1 mark)

(iii)Identify a repeating unit on the Spandex chain above.

(1 mark)

(iv)Draw the monomer of Spandex that most likely come from a diol.

(2 marks)

(v) This polymer returns to its original shape when not in use. Explain how this is possible.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

_______________________________________________________________ (2 marks)


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(b) Jadeite, NaAl(Si2O6) belongs to silicate family. The toughest Jadeite are carved and polished

to make jewelleries.

(i) Write the formula of Jadeite anion.

________________________________________________________________ (1 mark)

(ii) State the smallest Si:O ratio for Jadeite.

________________________________________________________________ (1 mark)

(iii)Draw two repeating units of Jadeite.

(2 marks)

(iv)Weaker types of Jadeite break in the form of needles. Explain the physical property ofJadeite.

_______________________________________________________________________

_______________________________________________________________________

_______________________________________________________________________

______________________________________________________________ (2 marks)

(c) Anorthite, CaAl2Si2O8 is an aluminosilicate that belongs to feldspar group.

(i) Write the aluminosilicate anion for Anorthite.

________________________________________________________________ (1 mark)

(ii) Deduce the parent silicate anion for Anorthite.

________________________________________________________________ (1 mark)


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QUESTION 4

(a) Castor oil contains 90 % 12-hydroxyoleic acid.

OH CH3

O

OH

12-Hydroxyoleic acid

(i) Draw the molecular structure of a triglyceride consists of only 12-hydroxyoleic acid.

(2 marks)

(ii) When castor oil is processed into soap, it works very well with many types of polar andnon polar stains.

Explain the effectiveness of soap anion made from castor oil in cleaning polar and non

polar stains.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

_______________________________________________________________ (2 marks)

(iii) Generally, soap anions are ineffective in hard water due to formation of scum with Ca2+

and Mg2+

ions. State one disadvantage of scum formation in cleaning process.

________________________________________________________________________

________________________________________________________________ (1 mark)


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(b) Clean water is very important in washing clothes. Water has to be free from suspended clay

to make sure clothes are properly washed.

Explain how Al2(SO4)3 is used in flocculating suspended clay in water treatment.

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________ (3 marks)

(c) Coloured stains can be oxidised and discoloured using bleach.

(i) Sodium hypochlorite is a type of bleach that releases chlorine bleach.

(1) Name the oxidising agent formed when sodium hypochlorite is dissolved inwater.

_________________________________________________________ (2 marks)

(2) State why this bleach can also disinfect water.

__________________________________________________________ (1 mark)

(ii) Another source of bleach is solid oxygen bleach.

Identify two types of oxidising agents released from solid oxygen bleach.

_______________________________________________________________ (2 marks)

(d) Tripolyphosphates is used to assist in detergent cleaning process.

(i) Draw a linear tripolyphosphate anion.

(2 marks)


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(ii) Describe how tripolyphosphates keeps the pH of water mildly alkaline.

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

_______________________________________________________________ (2 marks)

TOTAL: 17 marks


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You may write on this page if you need more space to finish your answers to Question Booklet 1.

Make sure to label each answer carefully (e.g. 4 (b)(iii) continued).

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International Education Centre, INTEC, UiTM 2008

trial 2009 booklet 1

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