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TEST CODE
F'ORM TP 20151
OzLIzOfi
MAY/JUNE 20I5
CARTBBEAN EXAMINATIONS COUNCII,
CARIBBEAN ADVANCED PROFICIENCY EXAMINATION@
CHEMISTRY. UNIT I
Paper 0l
I hour 30 minutesl
19 MAY 2015 (4.m.)
READ THE FOLLOWING, INSTRUCTIONS CAR.EFULLY;
t.
This testconsists of 45 items. You will have I houn and 30 minutes to answer them.
2.
ln addition to this test booklet, you should have an,answer sheet and a data booklet.
3.
Each item in this test has fbur suggested answers lettered (A), (B), (C)' (D). Read each item
you are about to answer and decide which choice is best.
4.
On your answer sheet, find the number which corresponds to your item and shade the space
having the same letter as the answer you have chosen, Look at the sample item below.
Sample ltem
Which of the tbllowing energy transitions is
the HIGHEST in an organic comPound?
(A)
(B)
(C)
(D)
Sample Answer
@. o@
n to ot
o to o*
n to fi+
E to 7r*
Tlre correct answer to this item is "6 to o*", so (B) has been shaded.
s
6.
t-
--t.!J-
rla
lf you want to change your answer, erase it completely betbre you fill in your new choice.
When you are told to begin, turn the page and work as quickly and as caref'ully as you can. If
you cannot answer an item, go on to the next one. You may return to that item later.
7.
You may do any rough work in this booklet.
8.
Figures are not necessarily drawn to scale.
9.
You rnay use a silent. non-programmable calculator to answer items.
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO.
-
L'upyright O 20 | 3 Caribbean Exarninations Council
,\ll riqhts reservcd'
:, ;V:i
:1
I
v
2L
Which of the fbllowing statements is NOT
a part of Dalton's atomic theory?
(A)
(B)
When an atom of liEU is bombarded with
a neutron, how many fundamental particles
(protons - p, neutrons - n and electrons.- e)
dbes an atom of the PRODUCT contain?
f,.
Atoms are indivisible.
Atoms are characterized by their
atomic number.
(C)
The atoms of an element have
(D)
identical properties.
The atoms of an element differ from
those, of other elements.
2.
e
(A)
(B)
9l
t46
9l
92
147
92
(c)
93
t46
93
(D)
93
147
93
Item 6 refers to the data in the following
(c)
(D)
ionic bonds
covalent bonds
hydrogen bonds
Van der Waals forces
table.
Atomic Mass
(amu)
Which of the following pairs of elements
combine to produce naturally occurring
compounds with formulae tYPe XY?
(A)
(B)
(C)
(D)
4.
n
The intermolecular forces pr€sent in ice are
(A)
(B)
3.
p
Sodium and sulfur
Sodium and nitrogen
Magnesium and chlorine
Magnesium and sulfur
1.4
=6 Pb
24.1
22.1
52.4
:0t Pb
6.
Based on the data in the table above, the
relative isotoPic mass of lead is
(A)
(B)
(C)
(D)
706.24 amu
207.24 amu
207.30 amu
208.30 amu
Item 7 refers to the fbllowing equation tbr
tlre production of ammonia.
(A)
@
:or Pb
r07 Pb
Which of the following diagrams represents
a pi (r) bond?
(B)
Abundance
(%)
N,(e)+3H,(g) - 2NH.(g)
7.
tf l0 cmi of nitrogen reacts with 30 cmr of
hydrogen at STB rvhat volume of NH', is
produced?
(c)
8
(D)
(A)
(B)
(C)
(D)
l0 cml
l5 cmr
20 cm3
40 cmi
(iO ON l'O fllF: NEX I'Pi\(iFl
.38:.
Item, l2 refers, to the tbllowing energy
profile diagram;
The first five ionization energies,,, of an.
element. X, are given in the fbllowing table;
Number,
I.E. (kI mol-r)
!
I
403
J
4
5
2633 3860 5080 6850
From thedataabove, itcan bededuced that
Xisa
(A)
(B)
(c)
(D)
Group I metal,
Transition metal
Group lV element
Croup V element
Productr.
Reecdon petb.-
9;
For complete reactioni 0,25 g of a monobasic
acid requires l0 cmr of 0.2 mol dm:3 sodium
12.
hydroxide; What is the relative molecular
mass,of the acid?
(A), P
(B) Q.
(c) (Q + P)
(D) (Q - P)
(A) tz.s
(B) 62.s
(c) r2s.0
(D) 2s0.0
13.
10.
Which of the following processes rcpresents
an oxidation?
ll.
(A)
MnO, -+ Mn2*
(B)
MnOr- -+ MnO*2-
(C)
MnO.,- -+ MnO,
(D)
MnO, -+ MnO,-
What is the activation energy of the.
REVERSE reaction?
A gas, in a syringe occupies a volume
of 50 cmr and has a pressure of 0.49
atmosphercs. What is the pressure of the
gas if the plungerofthe syringe is pushed in,
reducing the volume of the gas to 20 cmr?
(l atmosphere= l0l 325Pa)
(A)
(B)
(C)
(D)
20 kPa
125 kPa
20 000 kPa
125 000 kPa
Which of the fbllowing groups of solids
contains substances that ALL have giant
structures?
(A)
(B)
(c)
(D)
lce, iodine. iron
Graphite. iron, sodium fluoride
Carbon dioxide. magnesium oxide.
silicon( lV) oxide
lodine, silicon(lV) oxide, sodium
fluoride
GO ON TO l'l-lE,\EX'f PACE
-4l{.
18.
The simplest formula for a compound that
contains 50% S and 50% O bY rnass is
(A)
(B)
(A) so
(B)
(c)
release hydrogen gas into solution
act as an inert metal connection to
the H,/H* system
SO,
(C)
allow Platinumf ions to go lnto
S,O
(D)
reduce the surface areas rvhich
allows an' equilibrium to be
established in the'Hy'H* system '
(D) sro.
15.
In a standard hydrogen halt:'cell, a platinum
electrode is used to
A sffdent was asked to carry out an
experiment to investigate the prop€rtles
19.
of ionic and covalent compounds' Which'
of the following experiments: should the
solution
Ammonia is removed. from the system
represented bY the equation;
+
student use?
N,(e)'+ lu,(e)
l.
ll.
Itl.
EnthalPY of combustion
Which of the following statements about the
system is FALSE?,
(A)
(B)
(C)
(D)
I and Il onlY
I and lll onlY
It and lll onlY
l, ll and lll
Determination of melting point
ElectricalconductivitY
2NH3(g).
(A) K. remains constant:
igl 'fhere is a change in all
concentrations.
equilibrium position remains
The
(C)
(D)
tlre same,
Tlre rates of both tbrward and
reverse reaction decrease:
t6.
What is the effect on a chemical reaction of
introducing a catalYst in it?
(A)
(B)
ici
iOl
17.
20.
The activation energy is lowered'
The rate of the reaction is doubled'
The rate of the reaction is decreased'
The catalYst is consumed in the
reaction.
The rate law for a given reaction is
Rate = ktAls [B] . what are the units for
(A)
(B)
(C)
(D)
The reaction 2AB(g) * A{g) + B.(g) has
tlre rate law, Rate = k tABl. lf the half-life is
253 s, then the value of the velocity constant
(k) at the temperature of the reaction is
(A)
(B)
(C)
(D)
365,08 s
365.08 s-'
2.74 x lOa s
2.74 x l0-3 s-l
k?
mol-2dm-z s-r
mol dm-3 s-'
mol-r dmr s-'
mol-2 dm6 s-r
(iO ON fO'[l'lE NEX f Pi\Cti
52t.
Which of the acids in the table below is the
WEAKEST?
22.
The results for four experiments which
investigated the reaction between propanone
and iodine (catalysed by acid) are given in
Acid
K" (mol dmd)
(A)
(B)
4.9 x l0-ro
(c)
6.3 x l(F
I
I
0.5
I
(D)
1.3 x l0-3
1
0.5
0.5
I
s.3
J
0
0.25
I
5.4
4
0
0.5
0.5
r0.6
1.7 x l0-5
the table below.
Expt lH.l lPropanonel
The value of Ko fbr the equilibrium reaction
llodinel
H. (g) + l: (g) i= 2Hl (g) at 444 oC and
Wh ich of the following graphs represents the.
I atm pressure is 50.
order of reaction with respect to propanone?
What is the value of Ko if the pressure
is changed to 2 atm and the temperature
(A)
remains the same?
(A) 2s
(B) so
(c) loo
(D)
IPropenoncl
200
(B)
23.
Rate
l0.8
Equilibrium is established in the reaction
X (aq) + Y (aq) r=+ Z(aq). tf the equilibrium
concentrations are [X] = 0.2 rnol dmr.
[Y] = 0.: mol dm-r and [Z]= 0.6 mol dm{,
which of the following values is correct fbr
the equilibrium constant K.?
(A)
(B)
(C)
(D)
IPropanonel
0.1 mol dml
0.1 rnol-rdm-l
10.0 moldm-t
10.0 mol-'dml
(c)
lPropanonel
(D)
lPropanonel
CO ON TI) I-IIE NEX f PA( iE
.625.
The solubility product, K,o, ot 298 K for
three Group ll metal sult'ates is given in the
tbllowing table.
28.
A weak acid, HX. dissociates as tbllows:
HX(aq)+X-(aq)+H'(aq)
'Ihe
Sulfate
K
(moll tm{)
I
CaSO,
2.4 x l0-5
lt
SrSO.,
3.2 x l0-7
ill
BaSO.
1.6 x l0-'o
above is 1.0 x | 0-12 mol dm-3'
What will be the aPProximate PH of
1.0 x l0-2 mol dmj HX?
(A)
(B)
Which metal sulfate would precipitate out
dm'l
of solution if equal volumes of l0n mol
solution containing the sulfate ion and the
Group II metalare mixed?
(A) Ill onlY
(B) I and ll onlY
(C) ll and III onlY
(D) I,Il and lll
26.
27.
29.
8
Marine animals such as oysters and other
shellfish rely on the slow precipitation of
calcium carbonate to form their shells'
Which of the following properties help this
Greater ionic Product of Ca:' and
ll.
Greater solubilitY Product of
lll.
Smaller solubility product of
CaCOr(s)
CaCOr(s)
(A)
(B)
(C)
(D)
lJarium carbonate is more soluble in water
than in aqueous sodium carbonate because
(D)
(D)
COr2- ions
mola dm-r2
barium carbonate is not
a common ion efTect is present in
the BaCOrNa,CO, mixture
(c)
6
7
t.
moldm-3
moF dm-u
moP dm-e
(A) all barium salts are soluble
igl barium ions cannot disPlace
sodium ions
(C) sodium carbonate is ionic but
5
process?
Silver chromate(Vl), AgCrOo' is sparingly
soluble in water. The uniis for the solubility
product (K,) for silver chromate(Vl) are
(A)
(B)
(C)
(D)
dissoc iation contant, K", for the reaction
30.
I and Il onlY
| and lll onlY
II and lll onlY
l, ll and lll
(Sn)
The standard electrode potential of tin
(s), E"=-0'14 V'
is Sn:'(aq) +2eln which of the following equations is the
rnetal UNABLE to reduce Sn3*?
+Sn
(A)
igi
iCi
(D)
Mgt'(aq) *2e- -+ Mg(s), E"=-2'38 V
Fe:.(aq; +2e- + Fe(s), E"=-0'44 V
Zn2.(aq) 17e- + Zn(s), E"=-0'76V
Pbr'(aq) +2e- -+ Pb(s), E"=-0'13 V
(]o oN f() I't'lE Nlix',l'P,{GE
. ai?::-
' -
.
t!::i!:
-7 -
'e;J..!:"
-5:,i.r.:
. j-'t '
31.
Which, of the tbllowing ions ltas, the
GREATEST polarizing power?
(A)
Bd'
(B)
Car*
(c)
(D)
32.
(A)
(B)
(C)
(D)
Which of: the tbllowing t'actors. BEST
explain why barium carbonate, BaCO' is
rnore stable than magnesium carbonatq.
MgCO.,,lvhen heated?
l.
Mgt' and CO.,:- ore: v€F/ different,
in size.
Li*
ll.
Ba:' and COrs- are very different in
Sre"'
lll:
Ba2+ and COr2- are similar in size:
(A)
(B)
(C)
(D)
| and II only
I and lll only
It and lll only
l, Il and IIt-
Which'of the following properties increase
on descending the Group ll elements?
I.
ll.
Ill:
33.
34.
Atomic radii
lonization energy'
lonic radii
,
35.
Based, on its' position in Group' VII of the
periodio table, astatine; at room temperaturer
and pressure, is MOST likely a
I and ll only
I and III only
(A)
(B)
(C)
(D)
II and III only
I, II and lll
Silicon carbide has a structure similar to
tlrat of diamond; What are,the advantages,
derived from using silicon carbidE ceramics
size:
36,
solid
liquid
brown gas
colourless gas
Which of thE following properties does
when compared with steel?
NOT describe transition elements?
I.
(A)
(B)
(C)
(D)
ll.
lll.
Silicon carbide is less likely to
deform under compression.
Silicon carbide has a higher melting
point.
Silicon carbide is more resistant to
oxidation.
(A)
(B)
I and ll only
I and lll only
(c)
ll and lll only
I, ll and III
(D)
Forming complex ions
Showing variable oxidation states
Often ret'erred to as non-magnetic
Present in the d-block of the periodic
table
(.i(-) ()Nl 'f() l'lllr. FIEX'f ll\(lE
837.
Which of the tbllowing elements in the third
period has the SAME oxidation number in
ALL of its knorvn compounds?
(A)
(B)
(C)
(D)
{0.
into CaO(s) and SO.,(g). CaCO., decomposes
rt a much lolver temperature than CaSO..
Aluminium
Which of the following factors BEST
explains the greater thermal stability of
Chlorine
CaSO.?
Sultur
(A)
Phosphorus
(B)
(C)
Item 3E refers to the graph below showing
the first ionization energy (lE) of some
(D)
elements.
f
1000
eoo
800
.tl.
E
;5 700
600
CaCO., has a higher lattice energy
than CaSO".
CO, is a smaller molecule than SOr.
The COr'- ion is tnore easilY
polarized than the SOr:- ion.
The CO.,r- ion has a higher charge
density than the SO.2- ion.
When concentrated H.SO{ is added to solid
potassium iodide, the observations are white
steamy fumes and
E s00
400
(A)
(B)
(C)
(D)
300
200
100
0
On heating CaSO. strongly, it decomposes
Ca Sc fi
V CrMnFeCoNl CuZn
a white solid
a brown liquid
a rotten egg smell
nothing else
Elements
J8.
'Ihe sharp increase from copper (Cu) to zinc
Item 42 refers to the information in the
following table.
(Zn) is caused by filled
(A)
(B)
(C)
(D)
39.
4s-orbitals only
4d-orbitals only
4s-orbitals and 4d-orbitals
4s-orbitals and half-filled 4d-orbitals
Element
The ionic equation tbr the formation of
chromium hydroxide from chromium( I I l)
sulfate and dilute NH., (aq) is
(A)
CP- (aq) + OH- (aq)
(B)
Ct'-(s) + 3OH-(l) + Cr(OH)., (s)
(C)
Cd'(aq) + OH-(aq) + C(OH)r= (aq)
(D)
Cd.(aq) + 3OH-(aq) + Cr(OH), (s)
+ Cr.,OH (s)
12.
Melting
Point ("C)
Density
(g cmt)
I
| 538
7.86
II
660
2.70
ill
328
I t.34
Which of the elements in the table can be
c lassifi ed as transition?
(A)
(B)
(C)
(D)
| only
ll only
| and ll only
II and lll only
CJO
()N I'0 I'I.IE NEX T PACE
s-,*:i;
"?i"
i:-::
9Elements can be classified by their response to externally applied magnetic fields as diamagnetic,
paramagnetic and non'magnetic.
Which of the following elements is considered to have a high degree of para-magnetism?
(A)
(B)
(C)
(D)
14.
Sc
Zn
Which of the following compounds would produce the LOWEST pH rvhen 0.5 mol of it is bubbled
into I litreof water?
(A)
(B)
(C)
(D)
.15.
Ca
Co
SO,
SO,
CaO
Na,O
What deduction can be made from the following reactions of iodine and chlorine with sodium
thiosulfate?
l.(aq) + 2S,Or!(ag)
---->
aCl,(aq) + S,Or21aq) + 5H,O(l)
(A)
(B)
(C)
(D)
2l(aq) + SrOul(aq)
+
8Cl-(aq) + 2SOrr-(aQ) + l0H.(aq)
Chlorine is a stronger oxidizing agent than iodine.
lodine is a stronger oxidizing agent than chlorine.
Both chlorine and iodine are NOT oxdizing agents.
Both chlorine and iodine show the same oxidizing power.
END OF TEST
IF YOU FINISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.
i)2 il 201O/cAtrE 20 t 5