N04/4/CHEMI/HPM/ENG/TZ0/XX
IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI
c
88046101
CHEMISTRY
HIGHER LEVEL
PAPER 1
Wednesday 17 November 2004 (afternoon)
1 hour
INSTRUCTIONS TO CANDIDATES
Do not open this examination paper until instructed to do so.
Answer all the questions.
For each question, choose the answer you consider to be the best and indicate your choice on the
answer sheet provided.
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The Periodic Table
Atomic Number
1 2
H He
1.01 4.00
Element
3 4 5 6 7 8 9 10
Li Be B C N O F Ne
6.94 9.01 10.81 12.01 14.01 16.00 19.00 20.18
Atomic Mass
11 12 13 14 15 16 17 18
Na Mg Al Si P S Cl Ar
22.99 24.31 26.98 28.09 30.97 32.06 35.45 39.95
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
39.10 40.08 44.96 47.90 50.94 52.00 54.94 55.85 58.93 58.71 63.55 65.37 69.72 72.59 74.92 78.96 79.90 83.80
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
85.47 87.62 88.91 91.22 92.91 95.94 98.91 101.07 102.91 106.42 107.87 112.40 114.82 118.69 121.75 127.60 126.90 131.30
55 56 57 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
132.91 137.34 138.91 178.49 180.95 183.85 186.21 190.21 192.22 195.09 196.97 200.59 204.37 207.19 208.98 (210) (210) (222)
87 88 89 !
Fr Ra Ac
(223) (226) (227)

58 59 60 61 62 63 64 65 66 67 68 69 70 71
Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
140.12 140.91 144.24 146.92 150.35 151.96 157.25 158.92 162.50 164.93 167.26 168.93 173.04 174.97
!
90 91 92 93 94 95 96 97 98 99 100 101 102 103
Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
232.04 231.04 238.03 (237) (242) (243) (247) (247) (251) (254) (257) (258) (259) (260)
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1. Consider the following equation.
2C4H10(g) +13O2(g) 8CO2(g) +10H2O(l)
How many moles of are produced by the complete combustion of 58 g of butane, C4H10 (g) ?
CO2(g)
A. 4
B. 8
C. 12
D. 16
2. 6.0 moles of Fe2O3(s) reacts with 9.0 moles of carbon in a blast furnace according to the equation below.
Fe2O3 (s) + 3C(s) 2Fe(s) + 3CO(g)
What is the limiting reagent and hence the theoretical yield of iron?
Limiting reagent Theoretical yield of iron
Fe2O3
A. 6.0 mol
Fe2O3
B. 12.0 mol
C. carbon 9.0 mol
D. carbon 6.0 mol
3. What volume of 0.500 moldm-3 HCl(aq) is required to react completely with 10.0 g of calcium carbonate
according to the equation below?
CaCO3 (s) + 2HCl(aq) CaCl2 (aq) + H2O(l) + CO2 (g)
A. 100 cm3
B. 200 cm3
C. 300 cm3
400 cm3
D.
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4. A certain sample of element Z contains 60% of and 40% of . What is the relative atomic mass of
Z Z
element Z in this sample?
A. 69.2
B. 69.8
C. 70.0
D. 70.2
5. Which ion would undergo the greatest deflection in a mass spectrometer?
16
A. O+
16
B. O2+
18
C. O2+
D. (16O18O)+
6. Rubidium is an element in the same group of the periodic table as lithium and sodium. It is likely to be a
metal which has a
A. high melting point and reacts slowly with water.
B. high melting point and reacts vigorously with water.
C. low melting point and reacts vigorously with water.
D. low melting point and reacts slowly with water.
7. When the following species are arranged in order of increasing radius, what is the correct order?
A. Cl- , Ar, K+
B. K+ , Ar, Cl-
C. Cl- , K+ , Ar
D. Ar, Cl- , K+
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8. The cyanide ion, CN- , can form two complex ions with iron ions. The formulas of these ions are
[Fe(CN)6]4- and [Fe(CN)6]3- . What is the oxidation state of iron in the two complex ions?
[Fe(CN)6]4- [Fe(CN)6]3-
A.  4  3
B. +2 +3
C. +3 +2
D.  3  4
9. Which molecule is linear?
A. SO2
B. HS
2
C. CO2
D. Cl2O
PH3 NH3
10. Why is the boiling point of lower than that of ?
NH3
A. PH3 is non-polar whereas is polar.
B. PH3 is not hydrogen bonded whereas NH3 is hydrogen bonded.
NH3
C. Van der Waals forces are weaker in PH3 than in .
D. The molar mass of PH3 is greater than that of NH3 .
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11. Which molecule is non-polar?
A. H2CO
B. CHCl3
C. NF3
D. SO3
-
NH3
12. NO3 is trigonal planar and is trigonal pyramidal. What is the approximate hybridization of N in
each of these species?
NinNO- NinNH3
3
A. sp2 sp3
B. sp2 sp2
C. sp3 sp2
D. sp3 sp3
13. Consider the following statements.
2
I. All carbon-oxygen bond lengths are equal in CO3- .
II. All carbon-oxygen bond lengths are equal in CH3COOH .
III. All carbon-oxygen bond lengths are equal in CH3COO- .
Which statements are correct?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
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14. The temperature in Kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor
of four. What is the final volume of the gas?
A. 1.0 dm3
B. 2.0 dm3
C. 3.0 dm3
D. 4.0 dm3
15. Consider the following equations.
1
Mg (s) + O2 (g) MgO(s) "H = -602 kJ
2
1
H2 (g) + O2 (g) H2O (g) "H = -242 kJ
2
What is the "H value (in kJ) for the following reaction?
MgO(s) + H2 (g) Mg (s) + H2O(g)
A.  844
B.  360
C. + 360
D. + 844
16. For which of the following is the sign of the enthalpy change different from the other three?
A. CaCO3(s)CaO(s) +CO2(g)
Na(g) Na+ (g) + e-
B.
C.
CO2(s) CO2(g)
D.
2Cl(g)Cl2(g)
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17. Separate solutions of HCl(aq) and HSO(aq) of the same concentration and same volume were
2 4
NaOH(aq)
completely neutralized by . X kJ and Y kJ of heat were evolved respectively. Which statement
is correct?
A. X = Y
B. Y = 2X
C. X = 2Y
D. Y = 3X
"H
18. The enthalpy change, , for a chemical reaction is -10 kJ mol-1 and the entropy change, , is
"S
"G
-10 J K-1 mol-1 at 27 °C . What is the value of (in J) for this reaction?
A. -260
B. -7000
C. -9730
D. -13000
19. For a given reaction, why does the rate of reaction increase when the concentrations of the reactants are
increased?
A. The frequency of the molecular collisions increases.
B. The activation energy increases.
C. The average kinetic energy of the molecules increases.
D. The rate constant increases.
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20. Consider the following statements.
I. The rate constant of a reaction increases with increase in temperature.
II. Increase in temperature decreases the activation energy of the reaction.
- Ea
RT
III. The term A in the Arrhenius equation ( ) relates to the energy requirements of the
k = Ae
collisions.
Which statement(s) is/are correct?
A. I only
B. II only
C. I and III only
D. II and III only
21. For the chemical reaction
2NO (g) + O2 (g) 2NO2 (g)
the following reaction mechanism has been proposed.
NO (g) + NO (g) N2O2 (g) fast
N2O2 (g) + O2 (g) 2NO2 (g) slow
What could be the rate equation for this reaction?
A. rate = k[NO][O2]
B. rate = k[NO]2
C. rate = k[N2O2][O2]
D. rate = k[NO]2[O2]
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22. What will happen if CO2(g) is allowed to escape from the following reaction mixture at equilibrium?
-
CO2 (g) + H2O(l) H+ (aq) + HCO3 (aq)
A. The pH will decrease.
B. The pH will increase.
C. The pH will remain constant.
D. The pH will become zero.
23. The value of the equilibrium constant for the reaction
2HI(g) H2 (g) + I2 (g)
is 0.25 at 440 °C . What would the value of the equilibrium constant be for the following reaction at
the same temperature?
H2 (g) + I2 (g) 2HI(g)
A. 0.25
B. 0.50
C. 2.0
D. 4.0
moldm-3
24. Consider the following equilibria in 0.10 carbonic acid.
-
H2CO3 (aq) H+ (aq) + HCO3 (aq)
 2
HCO3 (aq) H+(aq) + CO3- (aq)
Which species is present in the highest concentration?
A. H2CO3(aq)
B. H+(aq)
-
C. HCO3 (aq)
2
D. CO3- (aq)
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25. The acid dissociation constant of a weak acid HA has a value of . What is the pH of a
1.0×10-5 mol dm-3
aqueous solution of HA?
0.10 mol dm-3
A. 2
B. 3
C. 5
D. 6
26. Which mixture would produce a buffer solution when dissolved in 1.0 dm3 of water?
CH3COOH
A. 0.50 mol of and 0.50 mol of NaOH
B. 0.50 mol of CH3COOH and 0.25 mol of NaOH
C. 0.50 mol of CH3COOH and 1.00 mol of NaOH
Ba (OH)2
D. 0.50 mol of CH3COOH and 0.25 mol of
27. Which compound, when dissolved in aqueous solution, has the highest pH?
A. NaCl
B. Na2CO3
C. NH4Cl
D.
NH4NO3
28. In which reaction is H2PO- (aq) acting as a Brłnsted-Lowry base?
4
A. HPO2-(aq) + NH+ (aq)
H2PO- (aq) + NH3 (aq)
4 44
B. HPO2- (aq) + H2O(l)
H2PO- (aq) + OH- (aq)
4
4
+
C.
H2PO- (aq) + C2H5NH2 (aq) HPO2- (aq) + C2H5NH3 (aq)
4 4
HPO4 (aq) + CHCOO- (aq)
H2PO- (aq) + CH3COOH (aq)
D.
3 3
4
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29. Consider the following reaction.
H2SO3 (aq) + Sn4+ (aq) + H2O (l) Sn2+ (aq) + HSO- (aq) + 3H+ (aq)
4
Which statement is correct?
A. HSO3 is the reducing agent because it undergoes reduction.
2
B. HSO3 is the reducing agent because it undergoes oxidation.
2
C. Sn4+ is the oxidizing agent because it undergoes oxidation.
D. Sn4+ is the reducing agent because it undergoes oxidation.
30. What happens at the positive electrode in a voltaic cell and in an electrolytic cell?
Voltaic cell Electrolytic cell
A. Reduction Oxidation
B. Oxidation Reduction
C. Oxidation Oxidation
D. Reduction Reduction
31. Consider the following reactions.
Cu2+ (aq) + 2e- Cu (s) E = +0.34 V
Mg2+ (aq) + 2e- Mg (s) E = -2.36 V
Zn2+ (aq) + 2e- Zn (s) E = -0.76 V
Which statement is correct?
Mg (s) and Zn (s)
A. Cu2+ (aq) will oxidize both .
B. Zn (s) will reduce both .
Cu2+ (aq) and Mg2+ (aq)
C. Mg2+ (aq) will oxidize both Cu (s) and Zn (s) .
D. Cu (s) will reduce both Mg2+ (aq) and Zn2+ (aq) .
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32. Consider the standard electrode potentials of the following reactions.
Cr3+(aq) + 3e- Cr (s)  0.75 V
Cd2+(aq) + 2e- Cd(s)  0.40 V
What is the value of the cell potential (in V) for the following reaction?
2Cr (s) + 3Cd2+ (aq) 2Cr3+ (aq) + 3Cd(s)
A.  0.35
B.  1.15
C. + 0.30
D. + 0.35
33. Aqueous solutions containing different concentrations of NaCl were electrolysed using platinum
electrodes. What is the major product at the positive electrode in each case?
0.001 mol dm 3 NaCl(aq) 1.0 mol dm 3 NaCl(aq)
H2 Na
A.
H2 H2
B.
O2 Cl2
C.
Cl2 O2
D.
34. Which compound has the lowest boiling point?
A. CH3CH2CH(CH3)CH3
B. (CH3)4C
C. CH3CH2CH2CH2CH3
D. CH3CH2OCH2CH3
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35. Which species will show optical activity?
A. 1-chloropentane
B. 3-chloropentane
C. 1-chloro-2-methylpentane
D. 2-chloro-2-methylpentane
36. What type of reaction does the equation below represent?
CH2=CH2 + Br2 BrCH2CH2Br
A. substitution
B. condensation
C. reduction
D. addition
37. Consider the following compounds.
I. CH3CH2CH(OH)CH3
CH3CH(CH3)CH2OH
II.
III. (CH3)3COH
The compounds are treated separately with acidified potassium dichromate(VI) solution. Which will
produce a colour change from orange to green?
A. I and II only
B. I and III only
C. II and III only
D. I, II and III
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38. Which compound reacts most rapidly by a SN1 mechanism?
A. (CH3)3CCl
B. CH3CH2CH2CH2Br
C. (CH3)3CBr
D. CH3CH2CH2CH2Cl
H NMR
39. Which compound shows three different environments for hydrogen atoms in the 1 spectrum?
A. CH3CH2CH3
B. CH2OHCH2OH
C. CH3CH2CH2OH
D. CH3CH(OH)CH3
40. Which statement is correct regarding the structure of benzene?
A. The 1H NMR spectrum of benzene shows six different environments for H atoms.
B. Benzene is a symmetrical, planar molecule with three single and three double bonds.
C. The enthalpy change for the hydrogenation of benzene is less exothermic than that of cyclohexatriene.
D. Benzene undergoes addition reactions more readily than substitution reactions.
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