PY 2021 Chem paper 1
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SPYC/S6 Chem/Mock Exam/lck1/p.
1
SHATIN PUI YING COLLEGE
S6 MOCK EXAMINATION 2020 - 2021
CHEMISTRY PAPER 1
Section A: 36 marks
Section B: 84 marks
( 2 hours 30 minutes )
This paper must be answered in English.
S6___ Name : ____________________(
)
GENERAL INSTRUCTIONS
1.
There are
TWO
sections, A and B, in this Paper. You are advised to finish Section A in about 45
minutes.
2.
Section A consists of multiple-choice questions in this question paper, while Section B contains
conventional questions printed separately in Question-Answer Book B.
3.
Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to Section
B should be written in the spaces provided in Question-Answer Book B.
The Answer Sheet for
Section A and the Question-Answer Book for Section B will be collected separately at the end of
the examination.
4.
A Periodic Table is printed on the back of Question-Answer Book B. Atomic numbers and relative
atomic masses of elements can be obtained from the Periodic Table.
INSTRUCTIONS FOR SECTION A (MULTIPLE-CHOICE QUESTIONS)
1.
Read carefully the instructions on the Answer Sheet. Write your name, class and class number in the space
provided.
2.
When told to open this book, you should check that all the questions are there. Look for the words
‘END
OF SECTION A’
after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS.
You are advised to use an HB pencil to mark all the answers on the
Answer Sheet, so that wrong marks can be completely erased with a clean rubber. You must mark the
answers clearly; otherwise you will lose marks if the answers cannot be captured.
5.
You should mark only
ONE
answer for each question. If you mark more than one answer, you will receive
NO MARKS
for that question.
6.
No marks will be deducted for wrong answers.
SPYC/S6 Chem/Mock Exam/lck1/p.
2
This section consists of two parts. There are 24 questions in PART I and 12 questions in PART
II.
Choose the best answer for each question.
Candidates may refer to the Periodic Table printed on the back of Question-Answer Book B.
Part I
1.
Which of the following processes is most suitable for extracting sodium chloride from sea water?
A.
crystallization
B.
electrolysis
C.
fractional distillation
D.
simple distillation
2.
Which of the following processes will NOT produce carbon dioxide?
A.
Adding dilute ethanoic acid to marble
B.
Adding water to quicklime
C.
Burning butane in air
D.
Heating limestone strongly in air
3.
A student was asked to identify an element, which has the following properties:
(1)
It is a solid stored in an air-tight reagent bottle at room temperature.
(2)
It is insoluble in water but soluble in non-polar solvents.
(3)
It can oxidize sulphite ions to sulphate ions.
To which group of the Periodic Table does this element belong?
A.
Group I
B.
Group III
C.
Group V
D.
Group VII
4.
Which of the following hydroxides CANNOT be prepared by the given reaction?
A.
Fe(OH)
2
from the reaction between FeCl
2
(aq) and excess NH
3
(aq)
B.
Cu(OH)
2
from the reaction between CuSO
4
(aq) and excess NaOH(aq)
C.
Fe(OH)
3
from the reaction between FeCl
3
(aq) and excess NH
3
(aq)
D.
Pb(OH)
2
from the reaction between Pb(NO
3
)
2
(aq) and excess NaOH(aq)
SPYC/S6 Chem/Mock Exam/lck1/p.
3
5.
Which of the following solutions turns blue immediately upon the addition of 1 M FeSO
4
(aq)?
A.
KI(aq)
B.
KOH(aq)
C.
K
3
Fe(CN)
6
(aq)
D.
KSCN(aq)
6.
Quartz (SiO
2
) is harder than dry ice (CO
2
) because
A.
quartz has a giant network structure, but dry ice consists of discrete molecules.
B.
the atomic size of silicon is larger than that of carbon.
C.
a silicon atom has more electrons than a carbon atom has.
D.
the silicon-oxygen bond in quartz is strong, but the carbon-oxygen bond in dry ice is
weak.
7.
Potassium peroxodisulphate (K
2
S
2
O
8
) decomposes to potassium sulphate, sulphur trioxide and
oxygen upon heating. What is the mole ratio of sulphur trioxide and oxygen produced?
A.
1 : 2
B.
2 : 1
C.
3 : 2
D.
2 : 3
8.
The following three set-ups are used to investigate rusting. The three test tubes are allowed to
stand for one week.
(1)
(2)
(3)
Which of the following combinations about the three set-ups is correct?
Rusting observed
No rusting observed
A.
Amount of rust: (3) > (2)
(1)
B.
Amount of rust: (2) > (3)
(1)
C.
Amount of rust: (1) > (3)
(2)
D.
Amount of rust: (3) > (1)
(2)
cotton wool
anhydrous
CaCl
2
iron nail
iron nail
distilled water
iron nail
sea water
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SPYC/S6 Chem/Mock Exam/lck1/p.
4
9.
Which of the following reactions has a negative enthalpy change?
A.
Zn(s) + H
2
SO
4
(aq)
→
ZnSO
4
(aq) + H
2
(g)
B.
2NH
3
(g)
→
N
2
(g) + 3H
2
(g)
C.
CuCO
3
(s)
→
CuO(s) + CO
2
(g)
D.
2NaCl(aq) + 2H
2
O(l)
→
2NaOH(aq) + Cl
2
(g) + H
2
(g)
10.
20.0 cm
3
of 0.10 mol dm
−
3
NaOH(aq) is required for the complete neutralization of 0.568 g of
an organic acid, which has a formula of C
n
H
2n+1
COOH. What is the value of n?
(Relative atomic masses: H = 1.0, C = 12.0, O = 16.0)
A.
15
B.
16
C.
17
D.
18
11.
Which of the following combinations about the uses of polymers is correct?
Polymer
Use
A.
Polyester
Plastic optical fibre
B.
Low-density polyethene
Lunch box for fast food
C.
Polystyrene
Food wrapper
D.
Polyvinyl chloride
Insulating covering for electrical wires
12.
The following chemical reaction takes place in a silver oxide cell.
Ag
2
O(s) + Zn(s) + H
2
O(l)
→
2Ag(s) + Zn(OH)
2
(s)
What is the role of silver oxide in the cell?
A.
It is the negative electrode and the oxidizing agent.
B.
It is the negative electrode and the reducing agent.
C.
It is the positive electrode and the oxidizing agent.
D.
It is the positive electrode and the reducing agent.
SPYC/S6 Chem/Mock Exam/lck1/p.
5
13.
The enthalpy changes for some conversions are shown below:
Which of the following combinations is correct?
W
→
Z
Z
→
X
A.
exothermic
endothermic
B.
endothermic
exothermic
C.
exothermic
exothermic
D.
endothermic
endothermic
14.
Consider the reaction of ethane with bromine under light. The following enthalpy level diagram
represents one of the reaction steps involved.
Which of the following steps does this diagram best represent?
A.
Br
2
→
Br
•
+ Br
•
B.
CH
3
CH
3
+ Br
•
→
CH
3
CH
2
•
+ HBr
C.
CH
3
CH
2
•
+ Br
2
→
CH
3
CH
2
Br + Br
•
D.
CH
3
CH
2
•
+ CH
3
CH
2
•
→
CH
3
CH
2
CH
2
CH
3
15.
Refer to the standard enthalpy changes of combustion below:
What is the standard enthalpy change of the following reaction?
A.
-206 kJ mol
-1
B.
-652 kJ mol
-1
C.
+206 kJ mol
-1
D.
+652 kJ mol
-1
reactant(s)
product(s)
enthalpy
SPYC/S6 Chem/Mock Exam/lck1/p.
6
16.
The pH of 500 cm
3
of 0.10 M HCl is found to be 1. Which of the following actions will NOT
change the pH of the hydrochloric acid?
A.
Adding 250 cm
3
of distilled water to the acid
B.
Adding 5 g of calcium carbonate powder to the acid
C.
Adding 5 g of copper powder to the acid
D.
Adding 5 g of sodium hydroxide granules to the acid
17.
Which of the following observable changes can be made when adding a very small piece of
sodium to 50 cm
3
of copper(II) sulphate solution?
(1)
Sodium dissolves in the solution.
(2)
A dirty green precipitate forms.
(3)
Colourless gas bubbles evolve.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
18.
A student uses the following set-up to perform an experiment involving octane. The glass wool
soaked with octane is heated occasionally and aluminium oxide is heated strongly.
Which of the following statements about the experiment is/are correct?
(1)
The litmus solution turns red.
(2)
The bromine solution is decolorized.
(3)
A chemical change occurs at the aluminium oxide.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
litmus
solution
bromine (dissolved
in CCl
3
CH
3
)
heat
aluminium oxide
glass wool soaked
with octane
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SPYC/S6 Chem/Mock Exam/lck1/p.
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19.
The set-up below is used to show that hexane (C
6
H
14
) contains carbon and hydrogen. What are
X and Y?
X
Y
A.
PbSO
4
(s)
limewater
B.
NaOH(s)
bromine water
C.
anhydrous CoCl
2
(s)
limewater
D.
anhydrous CuSO
4
(s)
bromine water
20.
Which of the following methods can be used to distinguish between Na
2
CO
3
(s) and NaHCO
3
(s)?
(1)
Heating the two solids separately
(2)
Adding hydrochloric acid to the two solids separately
(3)
Adding saturated sodium chloride solution to the two solids separately
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
21.
Aluminium is the most abundant metal in the Earth’s crust. However, it is still important to
recycle aluminium. Which of the following are the reasons to recycle aluminium?
(1)
The extraction of aluminium consumes much electrical energy.
(2)
Aluminium ore is non-renewable.
(3)
The extraction of aluminium causes serious pollution.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
SPYC/S6 Chem/Mock Exam/lck1/p.
8
22.
Consider the following polymerization:
Which of the following statements is/are correct?
(1)
A mixture of products is produced.
(2)
The polymerization occurs at room temperature without using catalyst.
(3)
The polymer produced can dissolve in dilute sulphuric acid.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
23.
Which of the following statements about ethanedioic acid are correct?
(1)
Its empirical formula is C
2
H
2
O
4
.
(2)
All the hydrogen atoms in an ethanedioic acid molecule are ionizable.
(3)
The basicity of ethanedioic acid is 2.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
24.
Consider the following statements and choose the best answer:
1st statement
2nd statement
Both (NH
4
)
2
SO
4
and (NH
4
)
2
HPO
4
have
the same percentage by mass of nitrogen.
Both
(NH
4
)
2
SO
4
and
(NH
4
)
2
HPO
4
are
effective nitrogenous fertilizers.
A.
Both statements are true and the 2nd statement is a correct explanation of the 1st
statement.
B.
Both statements are true but the 2nd statement is NOT a correct explanation of the 1st
statement.
C.
The 1st statement is false but the 2nd statement is true.
D.
Both statements are false.
SPYC/S6 Chem/Mock Exam/lck1/p.
9
Part II
25.
Which of the following statements about transition metals is INCORRECT?
A.
The melting points of all transition metals are higher than 25
C.
B.
Iron and its ions can act as catalysts in some reactions.
C.
Most compounds of chromium and manganese are coloured.
D.
Nickel and cobalt form compounds with variable oxidation states.
26.
Which of the following compounds is optically active?
A.
B.
C.
D.
27.
NO(g) and O
2
(g) are added to a 2 dm
3
sealed container. The following reaction occurs:
2NO(g) + O
2
(g)
2NO
2
(g)
The change in number of moles of NO(g) is shown in the following table.
Time (s)
0
1
2
3
4
5
Number of moles
of NO(g)
(mol)
0.020
0.010
0.008
0.007
0.007
0.007
What is the rate of consumption of O
2
(g) in the first two seconds?
A.
0.0450 mol dm
−
3
s
−
1
B.
0.0060 mol dm
−
3
s
−
1
C.
0.0030 mol dm
−
3
s
−
1
D.
0.0015 mol dm
−
3
s
−
1
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SPYC/S6 Chem/Mock Exam/lck1/p.
10
28.
When 0.12 g of sodium is added to water, 51.9 cm
3
of hydrogen is produced at room temperature
and pressure.
2Na(s) + 2H
2
O(l)
→
2NaOH(aq) + H
2
(g)
What is the percentage yield of hydrogen?
(Relative atomic mass: Na = 23.0; molar volume of gas at room temperature and pressure = 24.0
dm
3
mol
−
1
)
A.
41.4%
B.
82.9%
C.
95.6%
D.
100%
29.
Compound
W
has the following properties:
(1)
It reacts with hydrogen in the presence of nickel catalyst.
(2)
It reacts with sodium hydroxide solution to form an ionic compound.
(3)
It does not react with acidified potassium dichromate solution.
Which of the following compounds may
W
be?
A.
CH
2
=CHCO
2
H
B.
CH
2
=CHCH
2
OH
C.
CH
3
CHO
D.
CH
3
COCH
3
30.
Paradol is a compound that can be found in ginger. Its structure is shown below:
Which of the following statements about paradol is correct?
A.
It is insoluble in water.
B.
The carbonyl group can be oxidized to a hydroxyl group.
C.
It can undergo addition polymerization.
D.
It exhibits enantiomerism.
SPYC/S6 Chem/Mock Exam/lck1/p.
11
31.
Consider the following three equilibrium systems:
(1)
PCl
5
(g)
PCl
3
(g) + Cl
2
(g)
(2)
H
2
(g) + I
2
(g)
2HI(g)
(3)
2NO(g) + O
2
(g)
2NO
2
(g)
Initially, the underlined species have the same equilibrium concentration. The volumes of the
equilibrium mixtures are then reduced by half at the same temperature. What is the correct order
of the concentrations of the underlined species when the reactions restore equilibrium?
A.
[PCl
3
] > [HI] > [NO
2
]
B.
[HI] > [NO
2
] > [PCl
3
]
C.
[NO
2
] > [PCl
3
] > [HI]
D.
[NO
2
] > [HI] > [PCl
3
]
32.
Which of the following compounds can react with NaBH
4
(aq) to form an alcohol?
(1)
(2)
(3)
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
33.
Gases
X
and
Y
are mixed in a closed container at 298 K. They react and finally reach an
equilibrium. The following table shows the changes in concentrations of the gases:
Gas
X
Y
Z
Initial concentration (mol dm
−
3
)
0.10
0.20
0
Final concentration (mol dm
−
3
)
0.05
0.05
0.10
Which of the following information can be obtained from the given data?
(1)
The reaction involved is
X
(g) +
Y
(g)
2
Z
(g).
(2)
The value of K
c
for this reaction is 1600 mol
−
2
dm
6
.
(3)
The system is a homogeneous equilibrium.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
SPYC/S6 Chem/Mock Exam/lck1/p.
12
34.
Consider the following chemical equilibrium in a sealed container:
2NO(g) + 2CO(g)
N
2
(g) + 2CO
2
(g)
Which of the following can indicate that an equilibrium has been established?
(1)
When two moles of nitrogen monoxide is consumed, one mole of nitrogen forms.
(2)
The pressure of the reaction mixture remains unchanged.
(3)
The density of the reaction mixture remains unchanged.
A.
(1) only
B.
(2) only
C.
(1) and (3) only
D.
(2) and (3) only
35.
Element
P
can undergo the following reactions:
Which of the following statements about element
P
are correct?
(1)
P
must be a transition metal which can form compounds of variable oxidation states.
(2)
P
may be iron.
(3)
Q
is an oxidizing agent.
A.
(1) and (2) only
B.
(1) and (3) only
C.
(2) and (3) only
D.
(1), (2) and (3)
36.
Consider the following statements and choose the best answer:
1
st
statement
2
nd
statement
The rate of conversion from glucose to ethanol
The conversion from glucose to ethanol
is increased by adding yeast.
is catalyzed
by enzymes in yeast.
A.
Both statements are true and the 2
nd
statement is a correct explanation of the 1
st
statement.
B.
Both statements are true and the 2
nd
statement is NOT a correct explanation of the 1
st
statement.
C.
The 1
st
statement is false but the 2
nd
statement is true.
D.
Both statements are false.
END OF SECTION A
P
PQ
n
PQ
m
Q
Q
where
m
>
n
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SPYC/S6 Chem/Mock Exam/lck1/p.
13
B
Shatin Pui Ying College
S6 CHEMISTRY
MOCK EXAMINATION
SECTION B : Question-Answer Book B
This paper must be answered in English.
INSTRUCTIONS FOR SECTION B
(1)
Write your name, class and class number in the space
provided on this page.
(2)
Refer to the general instructions on the cover of the
Question Paper for Section A.
(3)
This section consists of TWO parts, Part I and
Part II.
(4)
Answer ALL questions in both Parts I and II. Write your
answers in the spaces provided in this Question-
Answer Book. Do not write in the margins. Answers
written in the margins will not be marked.
(5)
An asterisk (*) has been put next to the questions
where one mark will be awarded for effective
communication.
(6)
Supplementary answer sheets will be provided on
request. Write your name, class, class number and
question number on the answer sheets and put them
INSIDE this Question-Answer Book.
(7)
No extra time will be given to you for filling in your
name, class and class number in the Question-Answer
Book after the ‘Time is up’ announcement.
Name
Class
Class no.
Question
No.
Marks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Total
SPYC/S6 Chem/Mock Exam/lck1/p.
14
Answers written in the margins will not be marked.
Answers written in the margins will not be marked.
PART I
Answer
ALL
questions. Write your answers in the spaces provided.
1.
Aluminium and iron are the first two most abundant metals in the Earth’s crust. They are widely
used today.
(a)
The electronic arrangement of an iron atom is 2, 8,
a
, 2. Deduce the value of
a
.
(1 mark)
(b)
The bonding in aluminium and iron are similar. Describe the bonding of metals in solid state.
(1 mark)
(c)
Complete the following table by stating the natural source and the method of extraction from
the source for each metal.
Metal
Natural source
Method of extraction
Aluminium
Iron
(4 marks)
(d)
The uses of metals are related to their properties.
(i)
Suggest one property of iron which makes it suitable for making car bodies.
(ii)
Suggest one property of aluminium which makes it suitable for making kitchen foil.
(2 marks)
SPYC/S6 Chem/Mock Exam/lck1/p.
15
Answers written in the margins will not be marked.
Answers written in the margins will not be marked.
2.
Acidified potassium permanganate solution is a powerful oxidizing agent.
When propene is bubbled into cold acidified potassium permanganate solution, a redox reaction
occurs.
(a)
State an observable change for the reaction.
(1 mark)
(b)
(i)
Write a chemical equation for the reaction involved. (Use [O] to represent the oxidizing
agent.)
(ii)
Give the systematic name of the product.
(2 marks)
(c)
Explain why the reaction involved is regarded as an addition reaction.
(1 mark)
(d)
State the expected observable change and write the ionic equation for the reaction involved
when adding iron(II) sulphate solution to acidified potassium permanganate solution until
in excess.
(2 marks)
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SPYC/S6 Chem/Mock Exam/lck1/p.
16
Answers written in the margins will not be marked.
Answers written in the margins will not be marked.
3.
The diagrams below show the component of a chemical cell, an experimental set-up and how the
pointer of the volume deflects when the set-up is connected to the component.
(a)
Why does the pointer of the voltmeter deflect as shown when a few drops of water are added
to the component?
(2 marks)
SPYC/S6 Chem/Mock Exam/lck1/p.
17
Answers written in the margins will not be marked.
Answers written in the margins will not be marked.
(b)
Write the half equation for the change that occurs at each of the following electrodes when
the pointer of the volume deflects:
(i)
anode
(ii)
cathode
(2 marks)
(c)
Consider the following design modified from
Diagram (1)
by only removing the copper
coating at side A:
Draw on
Diagram (2)
the expected position of the pointer of the voltmeter when water is
added to the component.
(1 mark)
(d)
In the design in part (c) above, a redox reaction occurs at side A when water is added to the
component.
(i)
Write a chemical equation for the reaction.
(ii)
Name this type of reaction.
(2 marks)
SPYC/S6 Chem/Mock Exam/lck1/p.
18
Answers written in the margins will not be marked.
Answers written in the margins will not be marked.
4.
Consider the following substances:
Cl
2
CsCl
MgCl
2
NaCl
PCl
3
SCl
2
(a)
Define the term ‘electronegativity’.
(1 mark)
(b)
Which of the above substances has non-polar bonds? Explain your answer.
(1 mark)
(c)
Which of the above substances is the most ionic? Explain your answer.
(1 mark)
(d)
(i)
Draw the three-dimensional structure of an SCl
2
molecule.
(ii)
Explain whether an SCl
2
molecule is polar.
(2 marks)
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SPYC/S6 Chem/Mock Exam/lck1/p.
19
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5.
Glycolic acid is a weak acid that can be found in some skin-care products. The structure of
glycolic acid is shown below.
To be regarded as non-hazardous, the amount of glycolic acid in skin-care products should not
exceed 12 g per 100 cm
3
.
(a)
Explain why glycolic acid is regarded as a monobasic acid.
(1 mark)
(b)
Explain, with the aid of a chemical equation, whether 0.01 M glycolic acid solution has a
pH greater than, smaller than or equal to 2.
(2 marks)
(c)
To determine the amount of glycolic acid in a toner, 7.50 cm
3
of the toner is diluted to 100.0
cm
3
using distilled water. Four portions of 25.0 cm
3
of the diluted solution are titrated with
0.150 M potassium hydroxide solution. The average volume of the potassium hydroxide
solution required is 21.40 cm
3
.
(i)
Write a chemical equation for the reaction involved in the titration.
(ii)
Suggest a suitable indicator for the titration.
SPYC/S6 Chem/Mock Exam/lck1/p.
20
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Answers written in the margins will not be marked.
5.
(c)
(iii)
Determine whether the toner is hazardous from the titration results.
(Molar mass of glycolic acid = 76.0 g mol
−
1
)
(4 marks)
(d)
For the titration in (c), the pipette used to transfer the diluted solution is rinsed with water
only. Explain how this practice will affect the titration result.
(2 marks)
*6.
With the aid of chemical equations, outline how you would carry out tests to distinguish three
gases: carbon dioxide, sulphur dioxide and nitrogen monoxide.
(5 marks)
SPYC/S6 Chem/Mock Exam/lck1/p.
21
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Answers written in the margins will not be marked.
7.
Lithium aluminium hydride (LiAlH
4
) is a strong reducing agent. The controlled hydrolysis of
LiAlH
4
can be a source of hydrogen in vehicles. The chemical equation for the reaction involved
is shown below:
LiAlH
4
(s) + 4H
2
O(l)
→
LiOH(s) + Al(OH)
3
(s) + 4H
2
(g)
(a)
Using the data in the following table, calculate the standard enthalpy change of the
hydrolysis of lithium aluminium hydride.
Compound
Δ
H
f
(kJ mol
−
1
)
Al(OH)
3
(s)
−
1277
H
2
O(l)
−
285.8
LiAlH
4
(s)
−
116.3
LiOH(s)
−
487.5
(2 marks)
(b)
The hydrolysis of LiAlH
4
can generate hydrogen in vehicles. What is the volume (in cm
3
)
of LiAlH
4
needed to generate 0.5 kg of hydrogen? Does LiAlH
4
reduce the space occupied
when comparing with storing 0.5 kg of liquid hydrogen?
(Relative atomic masses: H = 1.0, Li = 6.9, Al = 27.0; densities of liquid hydrogen and solid
LiAlH
4
are 0.07 g cm
−
3
and 0.92 g cm
−
3
respectively)
(5 marks)
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SPYC/S6 Chem/Mock Exam/lck1/p.
22
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8.
Copper(I) iodide, also known as cuprous iodide, is a white solid. It can be prepared by mixing
copper(II) sulphate solution and potassium iodide solution. Iodine solution is also produced.
(a)
Write an ionic equation for the preparation of copper(I) iodide.
(1 mark)
(b)
Explain why copper(II) iodide is not synthesized in the reaction.
(1 mark)
(c)
The white precipitate produced could not be seen clearly in the resultant solution.
(i)
Suggest a possible explanation.
(ii)
Adding sodium thiosulphate solution (Na
2
S
2
O
3
(aq)) can make the white precipitate
visible again. The half equation for the oxidation of thiosulphate ions is shown below:
2S
2
O
3
2
−
(aq)
→
S
4
O
6
2
−
(aq) + 2e
−
With the aid of a chemical equation, describe how thiosulphate ions make the white
precipitate visible again.
(3 marks)
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SPYC/S6 Chem/Mock Exam/lck1/p.
23
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PART II
9.
The following equilibrium is established in a catalytic converter.
2CO(g) + 2NO(g)
2CO
2
(g) + N
2
(g)
Δ
H
< 0
When 0.92 mol of CO is mixed with 0.90 mol of NO in a 2.0 dm
3
closed vessel at a given
temperature, 0.50 mol of NO is found in the equilibrium mixture.
(a)
Calculate the equilibrium constant for the reaction at the given temperature.
(3 marks)
(b)
State and explain the change in the K
c
value of the equilibrium system when the temperature
increases.
(2 marks)
(c)
Name a transition metal used as the catalyst in a catalytic converter.
(1 mark)
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SPYC/S6 Chem/Mock Exam/lck1/p.
24
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*10.
At 60℃, MnO
4
-
(aq) reacts with C
2
O
4
2-
(aq) in an acidic medium to give Mn
2+
(aq) , CO
2
(g) and
H
2
O(l). The graph below shows the variation of the colour intensity of the reaction mixture with
time.
Based on the information above, write the chemical equation for the reaction and illustrate
THREE characteristics of transition metals exhibited by manganese.
(5 marks)
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SPYC/S6 Chem/Mock Exam/lck1/p.
25
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Answers written in the margins will not be marked.
11.
Ethanol can be prepared from the reaction between carbon dioxide and hydrogen. The equilibrium
constant of the reaction at 298 K is 2.95 × 10
11
mol
−
4
dm
12
.
2CO
2
(g) + 6H
2
(g)
CH
3
CH
2
OH(g) + 3H
2
O(g)
(a)
A student thinks that the reaction at 298 K should be very fast as the value of K
c
is very
large. Do you agree? Explain briefly.
(1 mark)
(b)
At different temperatures and constant pressure, the percentage of carbon dioxide reacted is
shown below.
Volume ratio of
H
2
: CO
2
Percentage of CO
2
reacted (%)
at 500 K
at 700 K
1.5
45
20
2.0
60
28
3.0
83
37
(i)
Deduce whether the forward reaction is exothermic or endothermic.
(ii)
What are the theoretical conditions for a high yield of ethanol? Explain briefly.
(iii)
Comment on whether it is possible to employ these theoretical conditions in industry.
(5 marks)
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SPYC/S6 Chem/Mock Exam/lck1/p.
26
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12.
Geraniol is an alcohol that can be found in rose oil. The skeletal formula of geraniol is shown
below.
(a)
State the type of isomerism that exists in
geraniol
.
(1 mark)
(b)
To which class of alcohols does
geraniol
belong?
(1 mark)
(c)
Geraniol can be converted to citronellal, which is an aldehyde. Citronellal has a smell of
lemon and is commonly used in mosquito repellent. The synthetic pathway of citronellal is
shown below.
(i)
State the type of reaction involved in Step 1.
(ii)
In Step 2, citronellal is distilled out as soon as it forms.
(1)
Suggest why heating under reflux is NOT preferred in this step.
(2)
State the expected observation in Step 2.
heat
Citronellal
Cr
2
O
7
2
−
(aq)/H
+
(aq)
Step 2
Step 1
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SPYC/S6 Chem/Mock Exam/lck1/p.
27
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12.
(c)
(iii)
Write the structural formula of citronellal.
(4 marks)
13.
Outline a synthetic route, with
no more than three steps
, to accomplish the following conversion.
For each step, give the reagent(s), reaction conditions (as appropriate) and structure of the organic
product.
(3 marks)
NH
2
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SPYC/S6 Chem/Mock Exam/lck1/p.
28
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14.
When heating calcium ethanoate strongly, acetone is produced. Acetone is a common solvent
used in the school laboratory.
(a)
What is the systematic name for acetone?
(1 mark)
(b)
Write a chemical equation for the thermal decomposition of calcium ethanoate.
(1 mark)
(c)
Acetone can be converted to isopropyl alcohol.
(i)
Draw the structural formula of isopropyl alcohol.
(ii)
Suggest the reagents required for the conversion.
(iii)
Which compound, acetone or isopropyl alcohol, has a higher boiling point? Explain
your answer.
(4 marks)
END OF SECTION B
END OF PAPER
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CHEMISTRY
Mock Exam Paper
SPYC/S6 Chem/Mock Exam/lck1/p.
29
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please answer all parts! thank you!
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234/91 Pa------> _________ + 234/92 U?
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A 20.0 g sample of KOH (A)(MW = 56.10 g A) will react with what volume (in mL) of
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Given: KH2POД (s) + 2 КОН (aq) ----» КзРОд (аq) + 2 H20 ()
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trans-cinnamic acid
Work up your spectrum well, and fill in Table 1 below. Omit any impurities, solvents, or other elements
that are not part of your compound. For the Figure, make a good drawing in ChemDraw (ACS-1996 settings),
inserting the compound name in bold below the structure. Then using small, bold, lowercase letters to match
the table, assign all of the 'H signals.
Figure 1: Structure and 'H NMR assignments for trans-cinnamic acid.
ОН
Table 1: Experimental 'H NMR data for trans-cinnamic acid.
Signal
8 (ppm)
Mult.
J-values (Hz)
Int.
a
11.3
1H
b
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2H
d
3H
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Identifying the limiting reactant in a drawing of a mixture
The drawing below shows a mixture of molecules:
key
carbon
hydrogen
nitrogen
sulfur
oxygen
chlorine
Suppose the following chemical reaction can take place in this mixture:
CO(g)+2 H,(9) → CH,OH(9)
Of which reactant are there the most initial moles? Enter its chemical formula:
Of which reactant are there the least initial moles? Enter its chemical formula:
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Explanation
Check
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Almonds are edible seeds that grow on trees. Wild almonds typically have a bitter taste caused by a chemical in the
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7
A This mutation could increase the population of wild almond trees.
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(c) This mutation could decrease the rate of the production for wild almond tree
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A student added 5 grams of calcium chloride, a white solid substance, to 15 grams of water at 22° C. Several observations were made and
the student inferred that a chemical reaction occurred.
Which observation best supports the student's inference that a chemical reaction occurred?
O A. The calcium chloride dissolved in the solution,
O B. The mass of the solution totals 20 grams.
O C. The temperature of the solution is 350 C.
O D. The solution became lighter in color.
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Calculating molarity using solute moles
A chemist prepares a solution of aluminum chloride (AIC1,) by measuring out 46. µmol of aluminum chloride into a 200. mL volumetric flask and filling the
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Calculate the concentration in mmol/L of the chemist's aluminum chloride solution. Be sure your answer has the correct number of significant digits.
mmol
L
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Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Elementary Principles of Chemical Processes, Bind...
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ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY