Anglo-Chinese School (Barker Rd)
PRELIMINARY EXAMINATION 2018
SECONDARY 4 EXPRESS
CHEMISTRY 6092
PAPER 1
TIME: 1 HOUR
INSTRUCTIONS TO CANDIDATES:
Do not open this booklet until you are told to do so.
There are forty multiple choice questions in this section. Select the best possible answer for each
question, and indicate your response by shading the appropriate box in the optical answer sheet
(OTAS) provided.
Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Scientific calculators may be used.
A copy of the Periodic Table is printed on page 19.
This question paper consists of 19 printed pages
Anglo-Chinese School (Barker Road)
Paper 1
Answer all questions on the OTAS sheet provided.
1
The diagram shows four pieces of apparatus that are used to measure the volume of a gas
or liquid.
Which piece of apparatus should always be filled to the same level?
2
A student was provided with only a thermometer, a stopwatch and a beaker.
What could the student measure?
3
A
10.5 g solid and 24.8 cm3 liquid
B
10.5 g solid and 25.0 oC
C
24.8 cm3 liquid and 45 s
D
25.0 oC liquid and 45 s
Hydrogen and helium have isotopes.
In which of these isotopes does the nucleus have twice as many neutrons as protons?
A
B
C
D
2
H
1
3
H
1
3
He
2
4
He
2
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Chemistry 6092
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4
5
Which statement about the particles
7
and
23
Na+ is correct?
11
A
They all contain more electrons than protons.
B
They all contain more neutrons than protons.
C
They all contain the same number of electrons.
D
They all contain the same number of protons.
Which statements about sulfur and its compounds are correct?
I
II
III
6
19 - 20
F , 10Ne
9
In hydrogen sulfide, H2S, sulfur atom shares one electron with each hydrogen atom.
Sulfur dioxide is used as a bleach.
Sulfur is in Group VI of the Periodic Table and has six outer shell electrons.
A
I and II only
B
I and III only
C
I, II and III
D
II and III only
Which statement about bonding is not correct?
A
A carbon atom can form four single covalent bonds.
B
Chlorine atoms react to achieve a noble gas electronic structure.
C
Covalent bonding involves losing and gaining electrons.
D
Hydrogen gas exists as a diatomic molecule.
The diagrams show the bonding in three covalent molecules.
Which of these molecules would combine to form ammonia?
A
1 and 2
B
1 and 3
C
1, 2 and 3
D
2 and 3
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8
The ‘lead’ in a pencil is made of a mixture of graphite and clay.
When the percentage of graphite is increased, the pencil slides across the paper more
easily.
Which statement explains this observation?
9
A
Each carbon atom in graphite is bonded to 3 other carbon atoms to form a
hexagonal structure with strong covalent bonds.
B
Each carbon atom in graphite is bonded to 3 other carbon atoms allowing graphite
to contain delocalised electrons.
C
Graphite has weak intermolecular forces of attraction between the layers of carbon
atoms.
D
Graphite has strong covalent bonds between the layers of carbon atoms.
Potassium nitrate is a salt that dissolves in water in an endothermic process.
What happens to the temperature and pH of the water as the salt dissolves?
temperature
pH
A
increases
decreases
B
increases
remains the same
C
decreases
increase
D
decreases
remains the same
10 Element X forms an oxide, XO, that neutralises sulfuric acid.
Which row describes X and XO?
element X
nature of oxide, XO
A
metal
acidic
B
metal
basic
C
non-metal
acidic
D
non-metal
basic
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11 A salt was added to excess hot aqueous sodium hydroxide. Ammonia gas was evolved.
When no more ammonia was evolved, aluminium was added to the solution remaining and
more ammonia gas was given off.
What was the salt?
A
NaCl
B
NaNO3
C
NH4Cl
D
NH4NO3
12 Acids are known as compounds which donate hydrogen ions.
NH3 (aq) + H2O (l) → NH4+ (aq) + OH– (aq)
Which compound in this equation is behaving as an acid?
A
ammonia
B
ammonium hydroxide
C
none of them
D
water
13 50.0 cm3 of 0.10 mol /dm3 silver nitrate is added to 150.0 cm3 of 0.05 mol /dm3 sodium
chloride in a beaker.
Apart from silver chloride, what is the resulting solution in the beaker after reaction?
A
aqueous silver nitrate and aqueous sodium nitrate
B
aqueous sodium chloride and aqueous sodium nitrate
C
aqueous sodium chloride only
D
aqueous sodium nitrate only
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14 In the graph shown, curve 1 was obtained by observing the decomposition of 100 cm3 of
1.0 mol/dm3 hydrogen peroxide solution, catalysed by manganese(IV) oxide.
2H2O2 → 2H2O + O2
Which change to the original experimental conditions would produce curve 2?
A
adding some 0.1 mol/dm3 hydrogen peroxide solution
B
lowering the temperature
C
using a different catalyst
D
using less manganese(IV) oxide
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15 A student measures the rate of the reaction between marble chips, CaCO3, and dilute
hydrochloric acid.
CaCO3 + 2HCl → CaCl2 + CO2 + H2O
Which diagrams show apparatus that are suitable for this experiment?
A
1 and 2
B
1, 2 and 4
C
2 and 3
D
2, 3 and 4
1
2
3
4
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16 The solvent ethanol is produced by the fermentation of sugar, using yeast.
Which graph correctly shows how the speed of fermentation changes with temperature?
17 Which compound(s) in these equations has/have been oxidised?
ℎ𝑒𝑎𝑡
CuCO3 →
CuO + CO2
CuO + SnO → Cu + SnO2
A
CO2 and CuO
B
CuCO3 and SnO
C
CuO
D
SnO
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18 When an iron extraction manufacturing plant is built near a city, the limestone buildings in
the city begin to crumble.
Which gas is most likely to cause this damage?
A
carbon dioxide
B
carbon monoxide
C
oxygen
D
sulfur dioxide
19 The diagram shows how aluminium is manufactured by electrolysis of molten aluminium
oxide.
molten
What are the anode and cathode made of?
anode
cathode
A
aluminium
aluminium
B
aluminium
graphite
C
graphite
aluminium
D
graphite
graphite
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20 The electrolysis set-up shown is not complete.
X
What should be shown at X when the solution has been electrolysed for some time?
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21 The diagram shows an electrolysis experiment of a solution using metals X and Y as
electrodes.
solution
X
Y
One of the metals becomes coated with copper.
Which metal becomes coated and which solution is used?
metal
solution
A
X
CuCl2
B
X
HCl
C
Y
CuCl2
D
Y
HCl
22 An organic acid, W, contains the elements carbon, hydrogen and oxygen. The composition
by mass of each element is shown.
element in W
percentage composition by mass (%)
carbon
35.8
hydrogen
4.5
oxygen
59.7
What is the empirical formula of W?
A
CH2O
B
C2H3O3
C
C4H6O5
D
C8H12O10
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Chemistry 6092
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23 A catalytic converter removes harmful gases from motor car exhausts.
Which reaction does not take place in a catalytic converter?
A
2CO + O2 → 2CO2
B
N2 + 2CO2 → 2NO + 2CO
C
2NO2 → N2 + 2O2
D
2NO2 + 4CO → N2 + 4CO2
24 Sodium nitrate decomposes on heating.
ℎ𝑒𝑎𝑡
2NaNO3 (s) →
2NaNO2 (s) + O2 (g)
What is the maximum volume of oxygen, in dm3, which could be obtained by heating x grams
of sodium nitrate?
A
24𝑥
23 + 14 + 16(3)
B
24𝑥
2[23 + 14 + 16(3)]
C
24𝑥
2(2)[23 + 14 + 16(3)]
D
24
2𝑥[23 + 14 + 16(3)]
25 An element melts at 1455 °C, has a density of 8.90 g/cm3 and forms a green chloride.
Where in the Periodic Table is this element found?
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Chemistry 6092
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26 The flowchart below shows some reactions.
yellow
precipitate
acidified
aqueous
silver nitrate
colourless iodide
solution
which turns blue
litmus paper red
aqueous sodium
hydroxide
G
salt
solution Y
bubble
chlorine
gas
through Y
brown
solution
Which of the following correctly identifies salt solution Y?
A
ammonium chloride
B
iron(III) iodide
C
sodium chloride
D
sodium iodide
27 The table compares the properties of Group I elements with those of transition elements.
Which row in the table is correct?
Group I elements
transition elements
A
low catalytic activity
high catalytic activity
B
low electrical conductivity
high electrical conductivity
C
high density
low density
D
high melting point
low melting point
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Chemistry 6092
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28 The apparatus shown is set up and left for a week.
water
Where would the water level be at the end of the week?
29 The results of experiments involving four metals, W, X, Y and Z, and their ions are shown.
Y (s) + Z+ (aq) → Y+ (aq) + Z (s)
W (s) + X+ (aq) → no reaction
Z (s) + X+ (aq) → Z+ (aq) + X (s)
What is the arrangement of the four metals in order of decreasing reactivity?
A
W→X→Y→Z
B
X→W→Z→Y
C
Y→Z→X→W
D
Z→Y→W→X
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30 Solder is an alloy of lead and tin. It is used for joining pieces of metal.
Which statement about solder is correct?
A
It can be represented by a chemical formula.
B
It contains a mixture of lead and tin atoms.
C
It contains lead and tin molecules chemically bonded.
D
It has a higher melting point than lead or tin.
31 Which item is made from mild steel?
A
a car body
B
a container to store gas in a chemical plant
C
a small cutting tool for use in an operating theatre
D
a set of cutlery
32 Petroleum is separated into useful fractions by fractional distillation. Separation occurs in a
fractionating column. A student records some properties of three of these fractions, not listed
in order, in a table as shown. He left some blanks in order for him to deduce the results using
the patterns observed.
fraction
number of carbon atoms in the
molecules
boiling point range / oC
5 – 10
1
2
320 – 350
3
200 – 250
16 – 24
Which statement is correct?
A
Fraction 1 has a higher boiling point range than fraction 2.
B
Fraction 2 is removed from a higher point in the fractioning column than fraction
1.
C
Molecules in fraction 3 have shorter chains than those in fraction 2.
D
None of the fractions are liquids at room temperature.
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33 What is not the correct use for the fraction named?
name of fraction
use
A
bitumen
making waxes
B
diesel
fuel for truck engines
C
kerosene
jet fuel
D
naphtha
making chemicals
34 Two statements are given about substances X, Y and Z.
Statement 1: A hydrocarbon X is cracked to make Y and hydrogen.
Statement 2: Compound Z is formed by the addition polymerisation of Y.
Which row in the table correctly classifies substances X, Y and Z?
saturated
unsaturated
A
X and Y
Y and Z
B
X and Y
Z
C
X and Z
Y
D
Y and Z
X and Y
35 A group of students wrote the names of some esters as shown below.
I
II
III
IV
methyl ethanoate
ethyl propanoate
ethyl methanoate
propyl methanoate
Which esters have the same molecular formula, C3H6O2?
A
I and II
B
I and III
C
II and IV
D
III and IV
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36 Tetrachloromethane is formed when molecule X reacts with chlorine in the presence of UV
light.
Which diagram shows molecule X?
37 Which statement(s) about polymers is/are correct?
I
II
III
They are compounds containing only carbon and hydrogen.
They are large molecules made from many smaller molecules.
Water is always eliminated during the formation of polymers.
A
II only
B
III only
C
I and II only
D
I, II and III
38 But-1-ene has the structural formula as shown.
Which is the formula of poly(but-1-ene)?
A
B
C
D
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39 Which substance is prepared by reacting ethanoic acid with methanol?
A
B
C
D
40 A student experiments with the properties of compounds W, X, Y and Z.
W
X
Y
Z
Which of the following is correct?
decolourises aqueous
bromine
has a pH of less than 7
A
X and Y
W, X and Y
turns acidified potassium
manganate (VII) from
purple to colourless
W, X, Y and Z
B
X and Y
X and Z
X and Z
C
W and Z
W, X and Y
X and Z
D
W and Z
W, X and Z
X and Z
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Anglo-Chinese School (Barker Road)
Preliminary Examinations 2018
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