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https://www.asi.edu.au/wp-content/uploads/2022/12/2010-asoe-chemistry-exam.pdf | 2010-asoe-chemistry-exam.pdf | true | 30 |
© Australian Science Innovations 2010 ABN 81731558309
CHEMISTRY
2010 National Qualifying Examination
TO BE COMPLETED BY THE STUDENT USE CAPITAL LETTERS
School Name: …………………………………………………………………..State: ………….
Student Name: ………………………………..…………………………………………………….
Home Address: ……………………………………………….………... |
https://www.asi.edu.au/wp-content/uploads/2022/12/2010-asoe-chemistry-exam.pdf | 2010-asoe-chemistry-exam.pdf | true | 30 |
© Australian Science Innovations 2010 ABN 81731558309
Do
not
write
on
this
page.
|
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© Australian Science Innovations 2010 ABN 81731558309
CHEMISTRY
2 0 1 0 NATIONAL QUALIFYING
EXAMINATIO N
Time Allowed
Reading Time: 15 minutes
Examination Time: 120 minutes
INSTRUCTIONS
• This paper is in two sections and you must answer each section according to the instructi... |
https://www.asi.edu.au/wp-content/uploads/2022/12/2010-asoe-chemistry-exam.pdf | 2010-asoe-chemistry-exam.pdf | true | 30 | Austr alian Scie n c e Olympiads
2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 2 of 28
© Australian Science Innovations 2010 ABN 81731558309
DATA
Avogadro constant (N)
6.02 × 1023 mol–1
Velocity of light (c)
2.998 × 108 m s–1
1 faraday
96,486 coulombs
Density of water at 2... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 3 of 28
© Australian Science Innovations 2010 ABN 81731558309
SECTION A
It is intended that candidates devote not more than 30 minutes to this section. An... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 4 of 28
© Australian Science Innovations 2010 ABN 81731558309
Q4
A gas X dissociates on heating to set up the following equilibrium:
X(g)
Y(g) + Z(g)
A quantity of X was heated at constant p... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 5 of 28
© Australian Science Innovations 2010 ABN 81731558309
Q8
A fuel/oxidant system consisting of monomethylhydrazine CH3NHNH2 and N2O4 (both liquids) is... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 6 of 28
© Australian Science Innovations 2010 ABN 81731558309
Q12 Samuel, a keen analytical chemist, was interested in determining the individual
concentrations of two different weak acids found in ferment... |
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Page 7 of 28
© Australian Science Innovations 2010 ABN 81731558309
Q13
TLC (thin layer chromatography) is used to separate mixtures of compounds based on the diff... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 8 of 28
© Australian Science Innovations 2010 ABN 81731558309
Q14
A unit cell is the smallest possible repeating unit for a structure. The diagram below represents the
unit cell of a simple (primitive) cub... |
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Page 9 of 28
© Australian Science Innovations 2010 ABN 81731558309
SECTION B
Marks will be deducted for incorrect use of significant figures. You are also advise... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 10 of 28
© Australian Science Innovations 2010 ABN 81731558309
As part of a prospector's assessment of a potential mining site, the chromite content of the ore must
be determined. Because of the potenti... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
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© Australian Science Innovations 2010 ABN 81731558309
(g)
What was the concentration of the stock sodium chromate solution?
... |
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© Australian Science Innovations 2010 ABN 81731558309
Q17
Amino acids are the building blocks of many biologically active compounds. This question concerns
the ability of amino acids to react ... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 13 of 28
© Australian Science Innovations 2010 ABN 81731558309
OH
O
N
H2
CH3
NH
O
OH
O
N
H2
CH3
OH
OH
N
H2
O
OH
+
+
O
H
H
Ala
Ser
Ala-Ser
water
(a)
Calcu... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 14 of 28
© Australian Science Innovations 2010 ABN 81731558309
Tandem mass spectrometry is a high throughput method for determining the sequence of
polypeptides. In this process, polypeptides are ionise... |
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© Australian Science Innovations 2010 ABN 81731558309
Another possible mode of fragmentation also involves C-N bond cleavage, but with protonatio... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 16 of 28
© Australian Science Innovations 2010 ABN 81731558309
(j)
The masses of b and y ions from a hexapeptide whose relative formula mass is 745.0 are tabulated
below in order of increasing relative fo... |
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Page 17 of 28
© Australian Science Innovations 2010 ABN 81731558309
Q18
The alcohol functional group is well known for being a component of some beverages, al... |
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Page 18 of 28
© Australian Science Innovations 2010 ABN 81731558309
Original Compound
Product of Oxidation
(ii)
O
H
O
O
H
Original Compound
Product of Oxidation
(iii)
HO
O
OH
O
... |
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© Australian Science Innovations 2010 ABN 81731558309
(b)
Draw the product when compound A (shown below) is treated with excess acidified potassium... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 20 of 28
© Australian Science Innovations 2010 ABN 81731558309
(d)
The iodoform test was performed on the following compound B. Decolourisation but no yellow
precipitate was observed. Suggest why this occ... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
Page 21 of 28
© Australian Science Innovations 2010 ABN 81731558309
(i) acidified KMnO4
(ii) PCC
(iii) I2/NaOH
... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
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© Australian Science Innovations 2010 ABN 81731558309
(f)
An unknown compound D was treated with each of the aforementioned three reagents, giving the
compounds shown below. Treatment with Tollen... |
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Page 23 of 28
© Australian Science Innovations 2010 ABN 81731558309
(g)
The above tests can also be used as a qualitative method of differentiating between compo... |
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2010 Chemistry N a tion al Qu alifying Ex amin ation
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© Australian Science Innovations 2010 ABN 81731558309
(h)
Alternatively, a compound can be tested sequentially with different reagents, as in the schematic
shown below. This may be convenient in ... |
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© Australian Science Innovations 2010 ABN 81731558309
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https://www.asi.edu.au/wp-content/uploads/2022/12/2009-asoe-chemistry-exam.pdf | 2009-asoe-chemistry-exam.pdf | true | 24 |
CHEMISTRY
2009 National Qualifying Examination
TO BE COMPLETED BY THE STUDENT USE CAPITAL LETTERS
School Name: …………………………………………………………………..State: ………….
Student Name: ………………………………..…………………………………………………….
Home Address: ……………………………………………….……………………………………..
……………………………………………………............................. |
https://www.asi.edu.au/wp-content/uploads/2022/12/2009-asoe-chemistry-exam.pdf | 2009-asoe-chemistry-exam.pdf | true | 24 |
Do
not
write
on
this
page.
|
https://www.asi.edu.au/wp-content/uploads/2022/12/2009-asoe-chemistry-exam.pdf | 2009-asoe-chemistry-exam.pdf | true | 24 |
CHEMISTRY
2 0 0 9 NATIO NAL QUALIFYING
EXAMINATION
Time Allowed
Reading Time: 15 minutes
Examination Time: 120 minutes
INSTRUCTIONS
• This paper is in two sections and you must answer each section according to the instructions.
Section A:
Answer ALL questions — spend no more than 30 minu... |
https://www.asi.edu.au/wp-content/uploads/2022/12/2009-asoe-chemistry-exam.pdf | 2009-asoe-chemistry-exam.pdf | true | 24 | Austr alian Scie n c e Olympiads
2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 2 of 22
DATA
Avogadro constant (N)
6.02 × 1023 mol–1
Velocity of light (c)
2.998 × 108 m s–1
1 faraday
96,486 coulombs
Density of water at 25°C
0.... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 3 of 22
SECTION A
It is intended that candidates devote not more than 30 minutes to this section. Answer ALL fifteen (15)
questions in this section on the ... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 4 of 22
Q4
Which of the following species does NOT have eight electrons around the central atom?
A
CCl4 molecule
B
BCl3 molecule
C
NH3 molecule
D
... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 5 of 22
Q8
It is known that carbon monoxide reacts exothermically with hydrogen gas to form methanol at
400⁰C, in the presence of a catalyst.
CO (g) + 2H2 (... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 6 of 22
Q11
Which of the following groups of ions can coexist in significant quantities in aqueous solution
without reacting with each other?
A
HSO4
–, K+,... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 7 of 22
Q15
A mixture containing both ethene and propene can undergo polymerisation under various different
reaction conditions. Which of the following segmen... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 8 of 22
SECTION B
Marks will be deducted for incorrect use of significant figures. You are also advised that steps to the solution
of problems must be clearl... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 9 of 22
(c) How many moles of NaOH react with 1 mol of A?
(d) What gas is evolved during the experiment?
(e) What is the ... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 10 of 22
(h) Write an equation for the reaction of G with a solution containing KMnO4 and dilute
sulfuric acid. Omit spectator ions.
(i) What is th... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 11 of 22
Q17
Functional groups are a group of atoms arranged in a particular way that is constant between all
molecules. Functional groups will behave in ... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 12 of 22
Carbon atoms and the implicit hydrogen atoms on carbon atoms are not drawn, so that
H3C
H2
C
C
H2
OH
is identical to
OH
(a)
Using the informat... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 13 of 22
Often in organic chemistry, more than one product may be formed in a specific reaction.
(c)
Draw all possible products in each of (i), (ii) and... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 14 of 22
To obtain a single product, sometimes “protections” are employed to “mask” certain functional
groups to prevent them from taking part in a reactio... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 15 of 22
amine
−NHTFA
HN
R
CF3
O
Option 1) LiOH
Option 2) K2CO3
amine
−NHAc
HN
R
O
HCl
carboxylic acid
−COOMe
R
OCH3
O
Option 1) LiOH
Option 2) ... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
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(iii)
Once the condensation reaction is complete, a protected version of compound C is obtained. Draw
the structure of the protected product and usin... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 17 of 22
(iii) Suggest why the product of this reaction does not readily form without the aid of protecting groups.
The second synthetic step invol... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 18 of 22
Q18
In most stable molecules, electrons come in pairs, either as covalent bonds or lone pairs. Atoms,
molecules or ions which contain unpaired el... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 19 of 22
The potential for a chain reaction means the damage caused by a single OH• radical can be extensive.
For this reason, the body has antioxidants to... |
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2009 Chemistry N a tion al Qu alifying Ex amin ation
Page 20 of 22
(f) 1.00 L of water containing 0.030 mol L–1 benzene as the only impurity is decontaminated using
FeSO4 and H2O2. Using the stoichiometry derived in... |
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CHEMISTRY
2 0 0 8 NATIO NAL QUALIFYING
EXAMINATION
Time Allowed
Reading Time: 15 minutes
Examination Time: 120 minutes
INSTRUCTIONS
• This paper is in two sections and you must answer each section according to the instructions.
Section A:
Answer ALL questions — spend no more than 30 minute... |
https://www.asi.edu.au/wp-content/uploads/2022/12/2008-asoe-chemistry-exam.pdf | 2008-asoe-chemistry-exam.pdf | true | 24 | Austr alian Scie n c e Olympiads
2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 2 of 24
DATA
Avogadro constant (N)
6.02 × 1023 mol–1
Velocity of light (c)
2.998 × 108 m s–1
1 faraday
96,486 coulombs
Density of water at 25°C
0.9... |
https://www.asi.edu.au/wp-content/uploads/2022/12/2008-asoe-chemistry-exam.pdf | 2008-asoe-chemistry-exam.pdf | true | 24 | Austr alian Scie n c e Olympiads
2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 3 of 24
SECTION A
It is intended that candidates devote not more than 30 minutes to this section. Answer ALL fifteen (15)
questions in this section on the mul... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 4 of 24
Q4
50.0 mL of absolute ethanol and 50.0 mL of pure water, both at 10°C, are mixed. At 10°C the
densities of water, absolute ethanol and the mixed solu... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 5 of 24
Q8
1 mole of nitrogen gas and 3 moles of hydrogen gas were added to a rigid 1 L container at 298 K and
left to react. At equilibrium it was found that... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 6 of 24
Q11
An aqueous solution of ammonia has of pH = x, and a solution of hydrochloric acid has pH = y; it is
also known that x + y = 14, and x > 11. If equa... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 7 of 24
Q15
When a 0.1 mol L–1solution of glycine hydrochloride is titrated against 0.18 mol L–1
sodium
hydroxide solution, titration curve I is obtained. Whe... |
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SECTION B
Marks will be deducted for incorrect use of significant figures. You are also advised that steps to the solution
of problems must be clearly... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 9 of 24
When the substituent groups are on the same side of the ring, the molecule is referred to as the
cis isomer and when they are on opposite sides it i... |
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Page 10 of 24
(e)
Which face (top, bottom or both equal) of the ring would be more likely to be approached by a
nucleophilic centre for the carbon designated by *?... |
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Page 11 of 24
Proposed Mechanism 2:
Reactions may occur in a number of elementary steps. Below is the first step of the reaction,
showing a planar carbocation... |
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Page 12 of 24
The product obtained from the experimental bromination of cholesterol is shown below.
H3C
H
HO
H
H
CH3
H3C
H
HO
H
H
CH3
Br
Br
Br2
(i)
Based on... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 13 of 24
Q17
Chemistry has been used for analysis of food and drink for many years. The fermentation of grapes
to produce wine is subject to strict quality... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 14 of 24
In the analysis of a white wine a 10.00 mL sample is diluted up to 500.00 mL in a volumetric flask.
From this diluted solution a 20.00 mL aliquot i... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 15 of 24
(g)
If a solution from a completed permanganate titration is used instead of wine for the analysis of
volatile acid, which of the above NaOH solution... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 16 of 24
Q18
Glucagon is produced in the cells of the pancreas and helps maintain the blood glucose concentration
within a normal range. It is often descri... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 17 of 24
Suppose this time that you had a very dilute solution of the dye in a cube-shaped container so that the
light travelled 1.0 cm through it. The abso... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 18 of 24
(b)
In a polypeptide containing several aromatic amino acids, the sum of the molar absorptivities per
amino acid Σεamino acid, is approximately equal... |
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Page 19 of 24
The frequency (expressed as a percentage) of the aromatic amino acids in an average polypeptide is
calculated from known amino acids sequences usin... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 20 of 24
Q19
The element A burns in oxygen to produce B, which can be catalytically oxidised further (using
V2O5/K2O) to C. B reacts with water to produce ... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 21 of 24
(c)
Identify all of the unknown compounds and write balanced chemical equations for all the reactions
shown in the diagram above.
A
... |
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2008 Chemistry N a tion al Qu alifying Ex amin ation
Page 22 of 24
(e)
Draw an electron dot diagram for each of B and C then draw two possible isomers of F. Hence
predict the shape of the molecules B, C and F (linear... |
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https://www.asi.edu.au/wp-content/uploads/2022/12/2007-asoe-chemistry-exam.pdf | 2007-asoe-chemistry-exam.pdf | true | 31 |
CHEMISTRY
2 0 0 7 NATIONAL QUALIFYING
EXAMINATION
Time Allowed
Reading Time: 15 minutes
Examination Time: 120 minutes
INSTRUCTIONS
• This paper is in two sections and you must answer each section according to the instructions.
Section A:
Answer ALL questions — spend no more than 30 minutes... |
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Page 2 of 31
DATA
Avogadro constant (N)
6.02 × 1023 mol–1
Velocity of light (c)
2.998 × 108 m s–1
1 Faraday
96,486 coulombs
Density of water at 25°C
0.9... |
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Page 3 of 31
SECTION A
It is intended that candidates devote not more than 30 minutes to this section. Answer ALL fifteen (15)
questions in this section on the mul... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 4 of 31
Q3
The density of liquid nitrogen is 0.807 g mL–1. If a person accidentally swallowed a 0.025 mL drop
of liquid nitrogen, what volume of nitrogen gas ... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 5 of 31
Q7
Which one of the following is not an isomer of the molecule depicted below?
C
H
H3C
C
C
H
C
H
H
CH2
H3C
C
C
H
H
C
C
H
CH2
H
CH3
H3C
D
C
CH2
H3C
C... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 6 of 31
Q10
Ethanoic acid was heated with an unknown compound X and a catalytic amount of concentrated
sulfuric acid. The reaction mixture was shown by mass sp... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 7 of 31
Q13
Sodium metal is produced industrially by the electrolysis of molten NaCl, while steel is produced by
CO reduction of ores containing Fe(III) in a b... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 8 of 31
Q15
The dichromate ion Cr2O7
2– is orange in aqueous solution whereas Cr3+ is green. An acidified
solution of potassium dichromate is thus a useful rea... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 9 of 31
SECTION B
Marks will be deducted for incorrect use of significant figures. You are also advised that steps to the solution
of problems must be clearly... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 10 of 31
Fiona did a little background reading and found the apparatus shown in the
diagram at the right was used for the titration. The setup allows the V2... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 11 of 31
Fiona also discovered the possibility of the following reaction between the vanadous ions and
hydrogen ions in solution:
2V2+ (aq) + 2H+ (aq) ... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 12 of 31
Q17
Mass spectrometry is an important tool in the determination of the structures of organic compounds.
The process begins with the ionisati... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 13 of 31
(b)
The m/z of a molecular ion containing only carbon, hydrogen and oxygen was determined to be
58.0417 units by high resolution mass spectrometry.
... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 14 of 31
(c)
Indicate on each of these molecules the two bonds most liable to break upon fragmentation of the
molecular ion.
(i)
C
O
C
C
C
H
H
H
H
H
H... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 15 of 31
(e)
A four-carbon compound containing only carbon, hydrogen and oxygen displayed a molecular ion
peak at m/z 74.0729 when subjected to high resolutio... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 16 of 31
Some elements exist in nature as a mixture of more than one isotope of high natural abundance.
Bromine appears as two abundant isotopes: 79Br (49.3... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 17 of 31
Q18
Whether a pure substance exists as a solid, liquid or gas depends not only on the temperature of the
system, but also on the pressure of the s... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 18 of 31
For example, since pure water has a vapour pressure of 3.17 kPa at 298 K, then in a mixture
containing 0.50 moles of water and 1.5 moles of ethanol,... |
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Page 19 of 31
As mentioned earlier, vapour pressure is temperature-dependent. For small changes in temperature, a
crude estimation of the change in vapour pressu... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 20 of 31
Raoult’s law and the dependence of vapour pressure on temperature can be used to explain why
solutes raise the boiling point of the solvent in whic... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 21 of 31
(iii) 0.5 mole acetic acid (CH3COOH) or 0.75 mole glucose (C6H12O6).
(j)
Raoult’s law states that the vapour pressure of the solvent above a ... |
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2007 Chemistry N a tion al Qu alifying Ex amin ation
Page 22 of 31
(l)
Hence or otherwise, given that the molar enthalpy of evaporation of water is ΔvapH = 40.65 kJ mol–1,
estimate the boiling point of EACH of the T... |
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