STPM trial chemistry term 2 2015
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This document contains a chemistry exam paper with multiple choice and long answer questions. It tests knowledge of topics including: 1. Cation and anion radii and lattice energies of ionic compounds. 2. Enthalpy calculations involving formation reactions of molecules like dinitrogen tetroxide. 3. Determining standard electrode potentials and writing redox half reactions. 4. Calculating standard enthalpies of solution and hydration using calorimetry data. 5. Trends in first ionization energies across the third period and acid-base properties of oxides.
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![PRA2 6AS/ 962 Paper 2 2015
1
Section A [15 marks]
Answer all questions in this section.
1 The radiusand charge of six cationsand anionsare shownbelow.
Ion P+
Q2+
R2+
X-
Y2-
Z2-
Radius/pm 238 152 140 180 145 200
If the ionicsolids PA ,QE and RI are of the same lattice type, whatisthe same lattice type,whatis
the correct orderof theirlattice energies,placingthe one withthe highestnumerical value first?
A RZ, QY, PX
B RZ, PX,QY
C QY, RZ,PX
D PX,QY, RZ
2 Dinitrogentetraoxide,N2O4 isformedwhennitrogendioxidedimerises,asshowninthe following
equation.
2NO2(g) →N2O4 ∆ H = -58.20 kJ mol-1
If the standardenthalpyof formationof NO2 is 33.94 kJmol-1
,calculate the amountof energy
absorbedwhen10.0 g of dinitrogentetraoxideisformed?
A 885 J
B 1052 J
C 1264 J
D 2477 J
3 The diagram belowshowsthe energylevel diagramforsodiumfluoride,NaF.
What isthe lattice formationenergyof sodiumfluorideinkJmol-1
?
A -62 B -594 C -928 D -1024](https://image.slidesharecdn.com/paper22015-150513124345-lva1-app6892/85/STPM-trial-chemistry-term-2-2015-1-320.jpg)
![PRA2 6AS/ 962 Paper 2 2015
2
4 The standard reductionelectrode potentialforseveral half-reactionsat298 K are shownbelow:
Half-cell reactions E° (V)
O2 + 2H+
+ 2e → H2O2 +0.68
H2O2 + 2H+
+ 2e → 2H2O +1.77
H2SO4 + 2H+
+ 2e → H2SO3 + H2O +0.17
HNO3 + 3H+
+ 3e → NO + 2H2O +0.96
Basedon the above data,whichof the followingstatementsiscorrect?
A HNO3 isthe strongestoxidizingagent.
B SulphuricacidoxidisesH2O2 tooxygengas
C H2O2 spontaneouslydecomposestooxygengas.
D Nitricoxide isformedwhenH2SO4 isaddedtonitricacid.
Section B
[15 marks]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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- 2. PRA2 6AS/ 962 Paper 2 2015 2 4 The standard reductionelectrode potentialforseveral half-reactionsat298 K are shownbelow: Half-cell reactions E° (V) O2 + 2H+ + 2e → H2O2 +0.68 H2O2 + 2H+ + 2e → 2H2O +1.77 H2SO4 + 2H+ + 2e → H2SO3 + H2O +0.17 HNO3 + 3H+ + 3e → NO + 2H2O +0.96 Basedon the above data,whichof the followingstatementsiscorrect? A HNO3 isthe strongestoxidizingagent. B SulphuricacidoxidisesH2O2 tooxygengas C H2O2 spontaneouslydecomposestooxygengas. D Nitricoxide isformedwhenH2SO4 isaddedtonitricacid. Section B [15 marks]
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- 5. PRA2 6AS/ 962 Paper 2 2015 5 END OF QUESTION PAPER