MOCK
Examination Paper
(COVER PAGE)
Session
:
July 2011
Programme
:
A – Level (CAL)
Course
:
CHM 1312 : Chemistry 2 (PAPER 1)
Date of Examination
:
September 13, 2011 (Tuesday)
Time
:
2.00pm – 3.00pm
Duration
:
1 Hour
Special Instructions
:
Reading Time:
Nil
Answer ALL the questions.
IMPORTANT NOTE
:
Materials permitted
:
THIS PAPER SHOULD NOT BE TAKEN OUT OF THE
EXAMINATION HALL
Non-programmable Calculator
Materials provided
:
Data Booklet
Examiner (s)
:
Ms Wong Suk Mei, Mr Subramaniam Panchacharam,
Ms Premah Ramasamy, Ms Lim Sze Theng and
Mr Vincent Tung Chin Aun
Moderator
:
Mr Subramaniam Panchacharam
This paper consists of 14 printed pages, including the cover page.
CHM 1312 (P1)/ Page 1 of 13
INTI INTERNATIONAL UNIVERSITY
A – LEVEL PROGRAMME (CAL)
CHM 1312: CHEMISTRY 2 (PAPER 1)
MOCK EXAMINATION: JULY 2011 SESSION
Instructions: Answer ALL questions.
1.
Copper(II) ions can be estimated volumetrically by the addition of an excess
of potassium iodide followed by titration of the liberated iodine with sodium
thiosulphate solution. The following equations apply:
2Cu2+ + 4I
I2 + 2S2O32
2CuI + I2
S4O62 + 2I
50 cm3 of 0.1 moldm−3 Na2S2O3 would be required to react with the iodine
produced. What is the mass of CuSO4 5H2O (in gram) used?
A
B
C
D
0.250
0.625
1.25
2.50
CHM 1312 (P1)/ Page 2 of 13
2.
Which one of the following statements about a solution of HX is correct?
A
B
C
D
3.
It is less concentrated and contains a weaker acid than the solution of
HY.
It is more concentrated and contains a stronger acid than the solution
of HY.
It is more concentrated and contains a weaker acid than the solution of
HY.
It is less concentrated and contains a stronger acid than the solution of
HY.
An atom in which the number of protons is lesser than the number of neutrons
is
A
234
92
B
6
3
Li
C
3
2
He
D
2
1
H
U
CHM 1312 (P1)/ Page 3 of 13
4.
–1
Which one of the following lists the first ionisation energies (in kJ mol ) of the
elements Al, Si, P, S and Cl in this order?
A
B
C
D
5.
1060
786
1000
1260
1000
1060
1260
1520
1260
1000
1520
418
BF3
CH 3
CH 3–
SF 3–
Which gas is likely to deviate most from ideal gas behaviour?
A
B
C
D
7.
786
577
1060
1000
Which one of the following molecules or ions is triangular pyramidal in shape?
A
B
C
D
6.
577
736
786
1060
HCl
He
CH4
N2
Use of the Data Booklet is relevant to this question.
Which one of the following samples of gas, when sealed into a vessel of
volume 0.10 m3, is at the highest pressure?
A
B
C
D
8.
1.6 g of helium (He) at 100 K
1.6 g of methane (CH4) at 100 K
1.6 g of oxygen (O2) at 600 K
1.6 g of sulphur dioxide (SO2) at 1200 K
Which of the following solids is an example of a substance with a simple
molecular structure?
A
B
C
D
aluminium chloride
silicon (IV) chloride
magnesium oxide
silicon (IV) oxide
CHM 1312 (P1)/ Page 4 of 13
9.
Which equation represents the change corresponding to the standard
enthalpy change of formation of MgO?
A
B
C
D
10.
Mg(s) + O(g)
MgO(s)
−
+
Mg (g) + O (g)
MgO (s)
2+
2−
Mg (aq) + O (g)
MgO (s)
1
Mg(s) + 2 O2(g)
MgO (s)
The data below refer to the industrial production of nitric acid from ammonia.
Reaction 1
Reaction 2
4NH3(g) + 5O2(g)
4NO(g) + 6H2O(g) ∆H = –909 kJmol–1
2NO(g) + O2(g)
2NO2(g) ∆H = –115 kJmol–1
The direct oxidation of ammonia to nitrogen dioxide can be represented by the
equation
4NH3(g) + 7O2(g)
4NO2(g) + 6H2O(g)
for which the standard enthalpy change, in kJmol–1, is
A
B
C
D
11.
12.
–1139
–1024
–794
–679
Which one of the following contains the metal with the lowest oxidation state?
A
CrO2F2
B
C
[Ni(NH3)6]
2–
[MnCl6]
D
[Mn(CN)6]
2+
3–
The extraction of aluminium involves the electrolysis of purified bauxite
dissolved in molten cryolite, Na3AlF6.
What is the main purpose of the cryolite?
A
B
C
D
to increase the electrical conductivity of the melt
to provide an additional source of aluminium
to prevent oxidation of the anodes
to reduce the melting point of the mixture
CHM 1312 (P1)/ Page 5 of 13
13.
The graph shows the equilibrium percentage of ammonia present during the
formation of ammonia by the Haber process:
N2 + 3H2
∆H = –92 kJ mol
2NH3
%NH3
–1
Curve A
Curve B
x axis
Which one of the following are correct labels for the graph?
A
B
C
D
x axis
Curve A
Curve B
temperature
temperature
pressure
pressure
high pressure
low pressure
high temperature
low temperature
low pressure
high pressure
low temperature
high temperature
14.
number
of molecules
with a given
energy
energy
The total area under the distribution curve represents
A
B
C
D
total energy.
activation energy.
total number of reacting molecules.
total number of molecules present.
CHM 1312 (P1)/ Page 6 of 13
15.
It is often said that the rate of a typical reaction is roughly doubled by raising
the temperature by 10 oC.
What explains this observation?
A
B
C
D
16.
17.
When equimolar amounts of each of the following are added to equal volumes
of water, the one giving the most acidic solution is
A
B
C
Na2O
MgO
SO2
D
P4O10
Which of the following statements is true for strontium or its compounds?
A
B
C
D
18.
Strontium does not burn in air.
Strontium does not react with steam.
Strontium carbonate decomposes at a higher temperature than calcium
carbonate.
The sum of the first two ionisation energies of strontium is greater than
calcium.
Which one of the following is not a correct trend down Group VII?
A
B
C
D
19.
Raising the temperature by 10 oC doubles the average energy of each
molecule.
Raising the temperature by 10 oC doubles the average velocity of each
molecule.
Raising the temperature by 10 oC doubles the number of collisions in a
given time.
Raising the temperature by 10 oC doubles the number of molecules
with energy more than the activation energy.
The first ionisation energy of the atom decreases.
The oxidising power of the element increases.
The electronegativity of the atom decreases.
The boiling point of the element increases.
Nitrogen dioxide and sulphur dioxide have some properties in common.
Which property is shown by one of these compounds, but not by the other?
A
B
C
D
forms ‘acid rain’
is a reducing agent
is insoluble in water
is used as food preservative
CHM 1312 (P1)/ Page 7 of 13
20.
An acidic impurity is removed from the gaseous emissions of a coal-fired
power station by passing them through an aqueous suspension of a mineral
followed by oxidation.
Which of the following combinations satisfies these conditions?
acidic impurity
mineral
oxidised product
NO2
SiO2
SO2
SO3
MgCO3
CaO
CaCO3
MgCO3
Mg(NO2)2
CaSiO3
CaSO4
MgSO4
A
B
C
D
21.
Which substance in a vehicle exhaust results from incomplete combustion of
a hydrocarbon fuel?
A
B
C
D
22.
CO
H2O
N2
NO
A hydrocarbon, which is a liquid at room temperature, decolourises aqueous
bromine.
What could be the molecular formula of the compound?
A
B
C
D
23.
C2H4
C7H16
C10H20
C20H40
In a preparation of ethene, ethanol is added a drop at a time to a heated
reagent Y. The impure ethene is washed by being bubbled through a solution
Z and then collected.
What could reagent Y and solution Z be?
Y
A
B
C
D
acidified K2Cr2O7
concentrated H2SO4
concentrated H2SO4
ethanolic NaOH
Z
dilute NaOH
dilute H2SO4
dilute NaOH
concentrated H2SO4
CHM 1312 (P1)/ Page 8 of 13
24.
Which one of the following can react both by nucleophilic addition and by
nucleophilic substitution?
A
CH 3
C
CH
CH 2
O
B
H 2C
CH 2
O
C
H
Cl
C
H 2C
CH
CH 2
Cl
D
CH 3
C
O
25.
How many moles of hydrogen chloride are evolved when an excess of PCl 5 is
added to one mole of citric acid?
A
B
C
D
26.
0
1
3
4
C
Acid hydrolysis of
O
O
produces
H 3C
A
B
C
D
27.
CH3CH(OH)CH2CH2COOH
CH2(OH)CH2CH2CH2COOH
CH3CH(OH)CH2CH2CHO
CH2(OH)CH2CH2CH2CHO
Propanoic acid reacts with methanol in the presence of a small amount of
concentrated sulphuric acid. The empirical formula of the ester formed is
A
B
C
D
CH2O
C2H6O2
C2H4O2
C2H4O
CHM 1312 (P1)/ Page 9 of 13
28.
Which structure could be part of a chain of poly(2-chloropropene)?
A
B
C
D
29.
How many structural isomers, which are esters, have the molecular formula
C5H10O2?
A
B
C
D
30.
CCl2CCl2CCl2
CH2CHClCH2
CCl(CH3)CH2
CH(CH3)CHCl
3
5
7
9
Certain chemical tests were performed on acrolein. The results of these tests
are given in the table below.
Test
Aqueous sodium carbonate
Acidified potassium dichromate(VI) and heat
Fehling’s solution and heat
Result
No change
Orange solution turns
green
Brick-red
precipitate
forms
Which one of the following functional groups do these results suggest that
acrolein contains?
O
A
C
H
H
B
C
OH
H
C
C
C
O
D
C
OH
CHM 1312 (P1)/ Page 10 of 13
SECTION B
For each of the questions in the section, one or more of the three numbered
statements 1 to 3 may be correct.
Decide whether each of the statements is or is not correct (you may find it helpful to
put a tick against the statements that you consider to be correct).
The responses A to D should be selected on the basis of
A
1, 2 and 3
are correct
B
1 and 2
only are
correct
C
2 and 3
only are correct
D
1 only
is correct
No other combination of statements is used as a correct response.
31.
Which of the following statements is/ are correct?
1
2
3
32.
Na atoms are larger than Mg atoms.
Mg2+ ions are smaller than Na+ ions.
Kr atoms are larger than Rb atoms.
Atoms around which the bonds are arranged tetrahedrally include
w
x
y
1
2
3
33.
atom w
atom x
atom y
Which of the following reaction(s) is/ are endothermic reaction(s)?
1
2
3
H2(g)
2H(g)
C4H10(g)
C2H4 (g) + C2H6(g)
+
−
Na (g) + e
Na(g)
CHM 1312 (P1)/ Page 11 of 13
34.
Which of the following statements about a catalyst is/are true?
1
2
3
35.
It does not alter the value of the equilibrium constant.
It increases the yield of product in an equilibrium.
It increases the proportion of molecules with higher energies.
Anhydrous barium nitrate and anhydrous magnesium nitrate both decompose
on heating, evolving nitrogen dioxide and oxygen and forming an oxide.
Which of the following statements concerning these decompositions is/ are
correct?
1 Nitrogen dioxide is evolved at lower temperature from magnesium nitrate
than from barium nitrate.
2 For both nitrates the volume of nitrogen dioxide evolved is four times
greater than the volume of oxygen.
3 Both nitrates are soluble in water.
36.
Which of the following operations form important parts of the industrial
production of sulphuric acid?
1 The burning of sulphur to form sulphur dioxide.
2 The reaction of sulphur dioxide with oxygen in the presence of a
vanadium (V) oxide catalyst.
3 The dissolving of sulphur trioxide in water.
37.
The reaction between haloethane CH3CH2X and aqueous sodium hydroxide
can be represented by the equation
CH3CH2X + NaOH → CH3CH2OH + NaX
In this reaction,
1 the intermediate is a carbocation
2 the rate of reaction increases in the order: CH3CH2Cl < CH3CH2Br <
CH3CH2I
3 the rate equation involves two species, CH3CH2X and the OH− ion
CHM 1312 (P1)/ Page 12 of 13
38.
The compound methyl 2-methylpropenoate (methacrylate) is used industrially
for the production of acrylic plastics such as ‘perspex’.
It has the structure
H
CH 3
C=C
H
C–O–CH3
O
Which of the following statements concerning this compound is/are correct?
1
2
3
39.
It is hydrolysed by aqueous sodium hydroxide to give methanoic acid.
It is reduced with hydrogen and a nickel catalyst.
It forms a polymer by an addition mechanism.
Which of the following pairs illustrate cis-trans isomerism?
1
2
3
CHM 1312 (P1)/ Page 13 of 13
40.
Limonene, which occurs in citrus fruits, belongs to a class of natural products
called terpenes. The conversion of limonene into compound X, via a
bromoalkane intermediate, is shown below. Compound X can be used in
cough medicine.
Types of mechanism shown in the reactions above include
1
2
3
electrophilic addition.
nucleophilic substitution.
nucleophilic addition.
~ The End ~
chm1312(p1)/july2011/formatted