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TEST CODE 02.112010 MAY/JUNE2013 CARIBBEAN
EXAMINATIONS
COUNCIL
CARIBBEAN ADVANCED PROFICIENCY EXAMINATION"' CHEMISTRY - UNIT 1
Paper 01
1 hour 30 minutes (
21
M~Y 2013 (a.m.)
)
READ THE FOLLOWING INSTRUCTIONS CAREFULLY.
1.
This test consists of 45 items. You will have I hour and 30 minutes to answer them.
2.
In addition to this test booklet, you should have an answer sheet'and a Data Booklet.
3.
Each item in this test has four suggested answers lettered (A), (B), (C), (D). Read each item you are about to answer and decide which choi<;e 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 cl10sen. Look at the sample item below.
Which of the followi11g transitions requires the HIGHEST energy in an organic compound? (A)
n to er•
(B)
n to 7t•
(C)
7t to 7t• cr to cr•
(D)
Sample Answer
..
@®©•
The best answer to this item is "cr to cr•", so answer space (D) has been shaded.
--=·--=
5.
If you want to change your answer, erase it completely before you fill in your new choice.
6.
When you are told to begin, turn the page and work as quickly and as carefully as you can. If you cannot answer an item, go on to the next one. You may return to this item later. Your score will be the total number of correct answers.
7.
You may do any.rough work in this booklet.
8.
Figures are 'not necessarily drawn to scale.
9.
You may use a silent, non-programmable calculator to answer items.
""""'
I · ..
DO NOT TURN THIS PAGE UNTIL YOU ARE TOLD TO DO SO.
Copyript C 2011 Caribbean Examin.tions Council A II ri nht• -••'"'•A
~---~--------~
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-2l.
Which of the following statements is NOT a part of Dalton's atomic theory? (A) (B) (C) (D)
Atoms are indivisible. Atoms are characterised by their atomic number. The atoms of an element have identical properties. The atoms of an element differ from those of other elements.
4.
Which of the following factors is important in determining the stability of an isotope? (A) (B) (C) (D)
5.
Item 2 refers to the following diagram which shows the energy levels for the hydrogen atom and the electronic transitions which produce lines in the visible region.
Which of the following statements is TRUE about 5 dm 3 of hydrogen and 5 dm' of oxygen at 0 °C and I OJ kPa? (A) (B)
==========::::;==::i===n=S
(C)
=_-=i=_-==-~:1=_1::=~-<:!=~-= ::~
Size of atomic radius Number of protons Ratio of protons to electrons Ratio of protons to neutrons
(D)
They react to produce water. They possess the same kinetic energy. They contain the same molecules. They react completely other.
5 dm' of amount of number of with each
- - - - - - - - - - n=l 6.
2.
Which of the series below involves transitions from higher energy levels to the n = 2 level?
Which of the following solids has a giant molecular lattice? (A) (B)
(A) (B) (C) (D)
3.
Balmer Dalton Lyman Paschen
( C) (D)
Carbon dioxide Copper oxide Magnesium oxide Silicon dioxide
Which of the following ions has the GREATEST polarizing power? (A)
Be'+
(B)
Ca2•
(C)
Li+
(D)
Sr•
!
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-3Item 11 refers to the following information.
Item 7 refers to the following equation which shows the production of ammonia. N 2(g) + 3H2(g)
7.
A piece of copper metal is placed in silver nitrate solution, as shown in the diagram below.
.= 2NH,(g)
-
If I 0 cm' of nitrogen reacts with 30 cm' of hydrogen at STP, what volume of NH, is produced? (A) (B)
(C) (D)
Cu metal
JO cm' 15 cm' 20cm' 40cm'
11.
8.
F9r complete reaction, 0.25 g ofa monobasic acid requires IO cm' of0.2 mol dm·' sodium hydroxide. What is the relative molecular mass of the acid?
Which of the following observations is correct?
(A) (B)
(A) (B) (C) (D)
9.
10.
12.5 62.5 125 250
(C) (D)
The simplest formula for a compound that contains 50% S and 50% 0 by mass is (A)
SO
(B)
(C)
so, s,o
(D)
s,o.
•
Which of the following gases is MOST likely to have the characteristics of an ideal
(A) (B) (C)
(D)
(A)
Mn02 --+ Mn2 +
(B),
Mno.---+ Mno
(C)
Mno.---+ MnO,
(D)
Mn02 --+ Mno.-
·-. -- .... -
12.
Copper metal dissolves and the solution remains colourless. Copper metal is deposited and the solution turns blue. Silver metal forms and the solution turns blue. Silver metal forms and the solution remains colourless.
gas?
Which ofthe following processes represents an oxidation?
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"
2-
•
13.
Ammonia Helium Methane Oxygen
A gas in a syringe occupies a volume of 50 cm' and has a pressure of 0.49346 atmospheres. What is the pressure of the gas if the plunger of the syringe is pushed in, reducing the volume of the gas to 20 cm'? (I atmosphere= IOI 325 Pa)
(A) (B) (C) (D)
20kPa 125 kPa 20 OOOkPa 125 000 kPa
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-414.
The second ionisation energy of calcium is 1150 kJ mo1-1 • Which of the following equations represents this statement?
kJmot 1 (A)
ca• (g) -+ Ca2• (g) + e-
L\H = +1150
(B)
Ca(g) -+ Ca2+ (g) + 2e-
L\H =+1150
(C)
ca• (g) -+ Ca2• (g) + e-
L\H =-1150
(D)
Ca (g) -+ Ca,. (g) + 2e-
L\H =-1150
Item 15 refers to the following standard enthalpies of combustion for carbon, hydrogen and octane.
kJmot 1 Carbon Hydrogen Octane
15.
The standard enthalpy of formation of octane,
-394 -286 -5476
MJ , is calculated using
(C)
MIJ (octane)= -8 (-394}-9(-286)-5476 kJ rnoJMIJ (octane)= -8 (-394}-9(-286)-{-5476) kJ mo1MIJ (octane)= 8 (-394) + 9(-286)-{-5476) kJ mo1-
(D)
L\H1 (octane)= 8 (-394)-9(-286)-{-5476) kJ mo1- 1
(A) (B)
1
1
8
• 1
•
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-5Item 16 refers to the following reaction which occurs in the presence of dilute acid. CH,COCH, (aq) + 12 (aq)--+ CH) COCH, (aq) + H• (aq) + 1- (aq) 16.
The rate equation for the reaction is Rate = k[CH,COCH, (aq)] [H'{aq)). Which of the following equations BEST illustrates the SLOW step?
(A)
(Il)
(C)
(D)
0
OH
II
I
CH,-C-CH, + H• -+CH,-C-CH, Ea
0
l
II
I
CH,- C-CH, + 12 --+ CH,-C-CH, + 1Ea 0
l
II
I
CH,- C - CH, + 1- --+CH,- C - CH, Ea
0
OH
II
I
CH-C-CH , , +I, +H• -+CH-C , I -CH, l
i
I
r
I
•
17.
The rate Jaw for a given reaction is Rate= k[A) 2 [B] . What are the units fork? (A) (B) (C) (D)
moJ-2 dm-2 s- 1 mo) dm-3 s- 1 moJ- 1 dm' s- 1 mo1-2 dm' s- 1
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-618.
Which of the following phrases BEST describes the relationship between the half-life of a second order reaction and the reactants?
(A) (B)
(C) (D)
20.
(A) (B)
Dependent on the initial concentration of the reactants Independent of the initial concentration of the reactants Dependent on the state of the reactants Dependent on the final concentration of the reactants
Item 19 refers to the following equilibrium. N, (g) + 0 2 (g)
~ 2NO(g),
Which of the following statements ·does NOT refer to a system in dynamic equilibrium?
(C) (D)
21.
Which of the following statements about a catalyst would be true?
LlH =+I 80 kJ moJ· 1 I.
19.
The reaction is reversible. The amounts of all the species in the system remain constant. The concentrations of all reactants and products are equal. The rate of the forward reaction is equal to the rate of the backward reaction.
Which of the curves in the diagram below shows how increasing temperature affects the yield of the product?
II.
Ill. (D)
(A) (B) (C)
.CD) 22. -----,(A)
Temperature (UC)
It increases the equilibrium constant for the forward reaction only. It increases the equilibrium constant for both the forward and backward reactions. It has no effect on the position of equilibrium. I only III only I and III only II and III only
The value of Kp for the equilibrium reaction H2 (g) + 12 (g) ~ 2HJ (g) at 444 'C at I atm pressure is 50. What is the value of KP if the pressure is changed to 2 atm and the temperature remains the same? (A)
25
(B)
50
(C) (D)
100 200
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-723.
In pure ethanol, (C,H,OH), the following equilibrium can exist with ammonium ions. NH; + C2H50H ~NH,+ C,H,OH,+ Which of the following combinations describes the functions of NH; and C,H,OH according to the Bronsted-Lowry theory? NH•
'
(A) (B)
(C) (D)
Acid Base Conjugate acid Acid
24.
The results for four experiments which . investigated the reaction between propanaone and iodine (ca~lysed by acid) are given in the table below. Expt
(H•]
[Propanone]
[Iodine]
Rate
I
I
0.5
I
10.8
2
0.5
I
3 4
0
0.5 0.25
I
5.3 5.4
0
0.5
0.5
10.6
C2H 50H
Base Acid Base Conjugate base
Which ofthe following graphs represents the order of reaction with respect to propanone? (A)
Rate
[Propanone) (B)
•
Rate
[Propanone)
(C)
Rate
[Propanone) (D)
Rate
lPs
»
I
• M1, ..,~,,.,,..A~"'"'..,
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l
r
- 8-
25.
Which of the following expressions represents the solubility product of iron(lll) hydroxide? (A)
(B)
27.
(A) (B) (C) (0)
[Fe>+] [JOH-] [Fe 3+] [OH-]3 [Fe(OH) 3 ]
(C)
[Fe1 •] [30H-]3
(D)
[Fe1 •] [OH-] 3
mol dm-' mol' dm-6 moP dm_. mol 4 dm-12
Which·ofthe following indicators is MOST suitable for use when titrating a weak acid against a strong base?· Indicator (A) (B) (C)
(0)
28.
26. · Silver chromate(VI), Ag,Cr04 , is sparingly soluble in water. The units. for the solubility product (K,,,) for silver chromate(VI) are
pH of Change
Methyl orange Litmus Bromothymol blue Phenolphthalein
3.5
6.0 7.0 9.5
Colour Change Acid ~Alkali
red -+ yellow red-+ blue yenow -+ blue colourless -+ pink
A weak acid, HX, dissociates as follows: HX(aq) .= x-(aq) + H'(aq) -The -dissocfation ·coiitint, K-; for the above reaction Is 1.0 x llf1,-mol am-3 .-w!tafwill oo • approximate pH of 1.0 x 10-2 mol dm-1 HX? (A) (B) (C) (D)
29.
the--
S 6 7 8
Using standard electrode potentials, which of the following reactions would be MOST feasible? (A) (B) (C)
(D)
Zn(s) + Cu''(aq)-+ Zn'+ (aq) + Cu(s) Zn(s) + Pb2•(aq) -+ Zn 2+(aq) + Pb(s) Pb(s) + Zn2•(aq) -+ Pb2• (aq) + Zn(s) Ca(a) + Zn2+(aq)- Cu,. (aq) + Zn(•)
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... -9-
Item 30 refers to the electrochemical cell below. Zn(s) I Zn 2• (aq) II Ag+ (aq) IAg(s) 30.
In the cell shown above, electrons originate from (A)
31.
Zn( s) I Zn''( aq)
(C)
Ag•(aq) I Ag(s) II Zn(s) I Zn2'(aq)
(D)
Zn(s) I Zn''(aq) II Ag• (aq) IAg(s)
Which of the following sets of oxides is classified rorrectly?
(D)
Acidic Amphoteric
Basic
co,
CuO
MgO
so, so,
Al,03
so,
co
P,0 10
Feature State at 25 °C
Barium Beryllium Magnesium Strontium
Solid
(C)
(B)
Solid
Liquid
(D)
Gas
Bonding and Ionic Giant Covalent Covalent Structure in Oxide lattice covalent molecular molecular 10
7
0
I
Match EACH oxide below with one of the options (A, B, C, or D) above. Each option may be used once, more than once or not at all. 33.
Oxide of silicon
34.
Oxide of sulphur
35.
Group II elements of the periodic table have
Cao
(A)
Na,O
so,
(B) (€)
Which of the following elements reacts very slowly with cold water and burns with a bright white flame? (A) (B) (C) (D)
(A)
pH of Aqueous Solution
(B)
(A) (B) (C)
32.
Ag'(aq) I Ag(s)
Items 33-34 refer to the information in the following table.
(D)
36.
high melting points and low dens4ties high electrical conductivities and low densities high melting points and high electrical conductivities low melting points and poor electrical conductivities
meli:ing point of graphite ~an be attributed to the
The high
(A) (B) (C) (D)
delocalised electrons hexagonal arrangement of the carbon atoms van der Waals' forces between the layers strong covalent bonds within the layers
,..,.., _...,
____ . ____ _
•
- I0 -
37.
(A) (B) (C) (D)
38.
Aluminium Chlorine Sulphur Phosphorus
~
0
s g
11-1
When AgNO,(aq) is added to fluoride ions followed by NH3(aq) the result is (A) (B) (C), (D)
39.
Item 41 refers to the graph below showing the first ionisation energy (IE) of some elements.
Which of the following elements in the third period has the same oxidation number in ALL of its known compounds?
no precipitate white silver fluoride yellow silver fluoride cream-coloured ammonium fluoride
Br-, Cl -, 1-
(B)
Cl-, 1-, Br·
(C)
c1-, Br·,1-
(D)
I-, Br-, Cl -
Ca Sc Ti V Cr MnFe Co Ni Cu Zn
Elements 41.
In which of the following options are the halide ions placed in order of INCREASING reducing power? (A)
1000 900 800 700 600 500 400 300 200 100 0
The sharp increase from copper (Cu) to zinc (Zn) is caused by filled (A) (B) (C) (D)
4s-orbitals d-orbitals 4s and d-orbitals 4s-orbitals and half-filled d-orbitals
Item 42 refers to the information in the table below. Element I
40.
On heating CaSO• strongly, it decomposes into CaO and SO,(g). CaCO, decomposes ani mucfi lower temperature than CaSO,. Which of the following factors BEST explains the greater thermal stability of CaSO,? (A)
(B) (C) (D)
CaC03 has a higher lattice energy than Caso,. CO, is a smaller molecule than SO,. The co, 2 - ion is more easily polarised than the SO,'-ion. The co,>- ion has a higher charge density than the so,>- ion.
42.
Melting Point (°C) 1538
Density (g cm-l)
7.86
II
660
2.70
III
328
11.34
Which of the elements in the table can be classified as transition? (A) (B) (C) (D)
I only II only I and II only II and Ill only
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- 11 -
43.
Items 44-45 refer to the following options.
Which of the following metals gives a green flame when heated? (A) (B) (C) (D)
(A) (B) (C) (D)
Calcium Copper Magnesium Sodium
A central ion in a complex A ligand An octahedral complex A tetrahedral complex
Match EACH formula below with one of the options (A, B, C or D) above. Each option may be used once, more than once, or not at all. 44.
[Co(H,O)J>+
45.
CH,NH 2
• END OF TEST.
IF YOU FINISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.
• 02112010/CAPE 2013
