hour
IB c
1 DIPLOMA PROGRAMME PROGRAMME DU DIPLME DU BI PROGRAMA DEL DIPLOMA DEL BI
M03/420/H(1)+
CHEMISTRY HIGHER LEVEL PAPER 1 Wednesday 14 May 2003 (afternoon)
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.
223-152
15 pages
223-152
1 3 4 5 6 7 0 2 He 4.00 5 B 10.81 6 C 12.01 7 N 14.01 8 O 16.00 16 S 32.06 33 As 74.92 34 Se 78.96 15 P 30.97 14 Si 28.09 32 Ge 72.59 13 Al 26.98 24 Cr 52.00 25 Mn 54.94 26 Fe 55.85 27 Co 58.93 28 Ni 58.71 29 Cu 63.55 43 Tc 98.91 42 Mo 95.94 74 W 183.85 30 Zn 65.37 31 Ga 69.72 9 F 19.00 17 Cl 35.45 35 Br 79.90 10 Ne 20.18 18 Ar 39.95 36 Kr 83.80
2
The Periodic Table
1 H 1.01 Element
Atomic Number
3 Li 6.94
4 Be 9.01
Atomic Mass
11 Na 22.99
12 Mg 24.31
19 K 39.10
20 Ca 40.08
21 Sc 44.96
22 Ti 47.90
23 V 50.94
2
37 Rb 85.47
38 Sr 87.62
39 Y 88.91
40 Zr 91.22
41 Nb 92.91
48 49 50 51 52 53 54 44 45 46 47 Cd In Sn Sb Te I Xe Ru Rh Pd Ag 101.07 102.91 106.42 107.87 112.40 114.82 118.69 121.75 127.60 126.90 131.30 84 Po (210) 85 At (210) 86 Rn (222)
55 56 57 72 Cs Ba La Hf 132.91 137.34 138.91 178.49
73 Ta 180.95
80 81 82 83 75 76 77 78 79 Hg Tl Pb Bi Re Os Ir Pt Au 186.21 190.21 192.22 195.09 196.97 200.59 204.37 207.19 208.98
87 Fr (223) 60 Nd 144.24 92 U 238.03 93 Np (237) 94 Pu (242)
88 Ra (226)
89 Ac (227) 66 67 68 69 70 71 61 62 63 64 65 Dy Ho Er Tm Yb Lu Pm Sm Eu Gd Tb 146.92 150.35 151.96 157.25 158.92 162.50 164.93 167.26 168.93 173.04 174.97
58 Ce 140.12
59 Pr 140.91
M03/420/H(1)+
90 Th 232.04
91 Pa 231.04
95 Am (243)
96 Cm (247)
97 Bk (247)
98 Cf (251)
99 Es (254)
100 Fm (257)
101 Md (258)
102 No (259)
103 Lr (260)
3 What amount of oxygen, O2 , (in moles) contains 1.8 1022 molecules? A. B. C. D. 0.0030 0.030 0.30 3.0
M03/420/H(1)+
1.
2.
3.0 dm3 of sulfur dioxide are reacted with 2.0 dm3 of oxygen according to the equation: 2 SO2 (g) + O2 (g) 2 SO3 (g) What volume of sulfur trioxide (in dm 3 ) is formed? (Assume the reaction goes to completion and all gases are measured at the same temperature and pressure.) A. B. C. D. 5.0 4.0 3.0 2.0
3.
What volume (in dm 3 ) of 0.30 mol dm -3 NaCl solution can be prepared from 0.060 mol of solute? A. B. C. D. 0.018 0.20 0.50 5.0
223-152
Turn over
4 4.
M03/420/H(1)+
Consider the composition of the species W, X, Y and Z below. Which species is an anion? Species W X Y Z A. B. C. D. W X Y Z Number of protons 9 11 12 13 Number of neutrons 10 12 12 14 Number of electrons 10 11 12 10
5.
What is the electron configuration for an atom with Z = 22? A. B. C. D. 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4p 2 1s 2 2s 2 2p 6 3s 2 3p 6 3d 2 4p 2 1s 2 2s 2 2p6 3s 2 3p6 4s 2 3d 2
6.
Which is related to the number of electrons in the outer main energy level of the elements from the alkali metals to the halogens? I. II. A. B. C. D. Group number Period number
I only II only Both I and II Neither I nor II
223-152
5 7. Which of the following salts form coloured solutions when dissolved in water? I. II. III. IV. A. B. C. D. ScCl3 FeCl3
NiCl2 ZnCl2
M03/420/H(1)+
I and II only II and III only III and IV only I, II, III and IV
8.
The compounds Na 2 O, Al 2 O3 and SO 2 respectively are A. B. C. D. acidic, amphoteric and basic. amphoteric, basic and acidic. basic, acidic and amphoteric. basic, amphoteric and acidic.
9.
What is the formula for the compound formed by calcium and nitrogen? A. B. C. D.
CaN Ca 2 N
Ca 2 N3 Ca 3 N 2
10.
2 What is the best description of the carbon-oxygen bond lengths in CO3 - ?
A. B. C. D.
223-152
One short and two long bonds One long and two short bonds Three bonds of the same length Three bonds of different lengths Turn over
6 11. Which of the following is true for CO 2 ?
C==O bond
CO 2 molecule
M03/420/H(1)+
A. B. C. D.
polar non-polar polar non-polar
non-polar polar polar non-polar
12.
The molar masses of C2 H 6 , CH 3OH and CH3F are very similar. How do their boiling points compare? A. B. C. D. C2 H 6 < CH3OH < CH3F CH3F < CH 3OH < C 2 H 6 CH3OH < CH3F < C 2 H 6 C2 H 6 < CH 3F < CH3OH
13.
- What is the distribution of electron pairs and the arrangement of atoms in the triiodide ion, I3 ?
Electron pairs A. B. C. D. tetrahedral square planar trigonal bipyramid trigonal bipyramid
Atom arrangement bent linear linear bent
223-152
7
M03/420/H(1)+
14.
What is the number of sigma ( ) and pi () bonds and the hybridization of the carbon atom in
O H
Sigma Pi
C
O
H
Hybridization
A. B. C. D.
4 4 3 3
1 1 2 1
sp 2 sp3 sp3 sp 2
15.
Solid, liquid and gaseous water are all present at very low pressure near 0 C . How do the distances between the molecules in the three states compare under these conditions? A. B. C. D. The distances are equal in all three states. Distances are similar in the solid and liquid, which are smaller than that in the gas. Distances are smallest in the solid, and similar in the liquid and gas. Distances are smallest in the liquid, and similar in the solid and the gas.
16.
In which gas sample do molecules have the greatest average kinetic energy? A. B. C. D.
H 2 at 100 K CH 4 at 273 K H 2O at 373 K
CH3OH at 353 K
223-152
Turn over
8 energy 17.
M03/420/H(1)+
What changes occur when chemical bonds are formed and broken? A. B. C. D. Energy is absorbed when bonds are formed and when they are broken. Energy is released when bonds are formed and when they are broken. Energy is absorbed when bonds are formed and released when they are broken. Energy is released when bonds are formed and absorbed when they are broken.
18.
Which combination of ionic charge and ionic radius give the largest lattice enthalpy for an ionic compound?
Ionic charge Ionic radius
A. B. C. D.
high high low low
large small small large
19.
Under what conditions is a reaction spontaneous at all temperatures?
H
S
A. B. C. D.
+ + - -
+ - - +
20.
What is H for the reaction below in kJ?
CS2 (g) + 3O 2 (g) CO 2 (g) + 2SO 2 (g)
[H f / kJ mol-1 : CS2 (g) 110, CO2 (g) - 390, SO 2 (g) - 290] A. B. C. D. -570 -790 -860 -1080
223-152
9 21. Which of the following is (are) important in determining whether a reaction occurs? I. II. A. B. C. D. Energy of the molecules Orientation of the molecules
M03/420/H(1)+
I only II only Both I and II Neither I nor II
22.
The reaction between NO 2 and F2 gives the following rate data at a certain temperature. What is the order of reaction with respect to NO 2 and F2 ?
[NO 2 ] / mol dm -3
[F2 ] / mol dm -3
Rate / mol dm -3 min -1 0.1 0.4 0.2
0.1 0.2 0.1
NO 2 order
0.2 0.2 0.4
F2 order
A. B. C. D.
first first second second
first second first second
23.
Which step in a multi-step reaction is the rate determining step? A. B. C. D. The first step The last step The step with the lowest activation energy The step with the highest activation energy
223-152
Turn over
10 24. I 2 (g) + 3Cl 2 (g)
M03/420/H(1)+
2ICl3 (g)
What is the equilibrium constant expression for the reaction above? A.
Kc = [ICl3 ] [I 2 ][Cl 2 ] 2[ICl3 ] 3[I 2 ][Cl2 ] 2[ICl3 ] [I 2 ] + 3[Cl2 ]
B.
Kc =
C.
Kc =
D.
[ICl3 ]2 Kc = [I 2 ][Cl 2 ]3
25.
Which of the factors below affect the equilibrium vapour pressure of a liquid in a container? I. II. III. A. B. C. D. Temperature Surface of the liquid Volume of the container
I only I and II only II and III only I, II and III
26.
How does the [H + ] in an aqueous solution with pH = 4 compare with the [H + ] in a solution with pH = 2? The [H + ] is A. B. C. D. twice as great. half as much.
1 of the value. 10 1 of the value. 100
223-152
11 27. Which is a buffer solution? I. II. A. B. C. D. I only II only Both I and II Neither I nor II 0.01 mol dm -3 HCl , 0.01 mol dm -3 NaCl
0.01 mol dm -3 CH 3COOH , 0.01 mol dm -3 CH 3COONa
M03/420/H(1)+
28.
Which one of the following species can act as both a Brnsted-Lowry acid and base in aqueous solution? A. B. C. D. CH3COOH
- NO3 - H 2 PO4
OH -
29.
The K a value for an acid is 1.0 10-2 . What is the K b value for its conjugate base? A. B. C. D. 1.0 10-2 1.0 10-6 1.0 10 -10 1.0 10 -12
223-152
Turn over
12
M03/420/H(1)+
30.
Separate 20.0 cm3 solutions of a weak acid and a strong acid of the same concentration are titrated with NaOH solution. Which will be the same for these two titrations? I. II. III. A. B. C. D. Initial pH pH at equivalence point Volume of NaOH required to reach the equivalence point
I only III only I and II only II and III only
31.
Which is the strongest reducing agent according to the spontaneous reactions below? 2Cr (s) + 3Fe 2+ (aq) 2Cr 3+ (aq) + 3Fe(s) Fe (s) + Pb 2+ (aq) Fe2+ (aq) + Pb (s) A. B. C. D.
Cr (s)
Cr 3+ (aq) Pb 2+ (aq)
Pb (s)
32.
What occurs during the operation of a voltaic cell based on the reaction: Ni (s) + Pb 2+ (aq) Ni 2+ (aq) + Pb(s) External circuit A. B. C. D. electrons move from Ni to Pb electrons move from Ni to Pb electrons move from Pb to Ni electrons move from Pb to Ni Ion movement in solution Pb 2+ (aq) move away from Pb(s) Pb 2+ (aq) move toward Pb(s) Ni 2+ (aq) move away from Ni(s) Ni 2+ (aq) move toward Ni(s)
223-152
13
33.
- Ag (s) + NO3 (aq) + H + (aq) Ag + (aq) + NO (g) + H 2O (l)
M03/420/H(1)+
When the oxidation-reduction equation above is balanced, what is the coefficient for H + (aq) ? A. B. C. D. 1 2 3 4
34.
Aqueous solutions of AgNO3 , Cu (NO3 )2 and Cr (NO3 )3 are electrolyzed using the same quantity of electricity. How do the number of moles of metal formed compare? A. B. C. D. Ag = Cu = Cr Ag > Cu > Cr Ag < Cu < Cr Cu > Ag > Cr
35.
Which of the substances below is least soluble in water? A.
CH 2 OHCHOHCH 2 OH
O
B.
CH3CCH3 O
C.
CH3CH2COH O
D.
CH3COCH3
223-152
Turn over
14
36.
M03/420/H(1)+
What product results from the reaction of CH 2 = CH 2 with Br2 ? A. B. C. D.
CHBrCHBr CH 2CHBr
CH3CH 2 Br
CH 2 BrCH 2 Br
37.
How many different tripeptides can be prepared from three amino acids? (Each amino acid is used only once in a given tripeptide.) A. B. C. D. 1 3 6 9
38.
The reaction of C6 H 6 with Br2 in the presence of a halogen carrier is expected to produce A. B. C. D. C6 H 6 Br C6 H 6 Br2 C6 H 4 Br2 + H 2 C6 H 5Br + HBr
39.
Which compound reacts fastest with water? A. B. C. D. (CH 3 )3 CBr (CH 3 )3 CCl CH3CH 2CH 2CH 2 Br CH3CH 2CH 2CH 2Cl
223-152
15
M03/420/H(1)+
40.
Which of the following compounds exhibits three lines in the 1 H NMR spectrum? I. II. III. A. B. C. D. I only II only I and III only I, II and III CH3CH 2OCH 3 (CH 3 )3 CCl CH3CH 2COOH
223-152