A-level Chemistry Question paper Paper 1 June 2018 - CIE Notes
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A-level CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Tuesday 5 June 2018
Afternoon
Time allowed: 2 hours
Materials For this paper you must have: ? the Periodic Table/Data Booklet, provided as an insert (enclosed) ? a ruler with millimetre measurements ? a scientific calculator, which you are expected to use where appropriate.
Instructions ? Use black ink or black ball-point pen. ? Fill in the boxes at the top of the page. ? Answer all questions. ? You must answer the questions in the spaces provided. Do not write outside
the box around each page or on blank pages. ? All working must be shown. ? Do all rough work in this book. Cross through any work you do not want to be
marked.
Information ? The marks for questions are shown in brackets. ? The maximum mark for this paper is 105.
For Examiner's Use
Question 1 2 3 4 5 6 7 8 9 10
Mark
TOTAL
*jun187405101*
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2 Answer all questions in the spaces provided.
Do not write outside the
box
0 1
This question is about lattice enthalpies.
0 1 . 1 Figure 1 shows a Born?Haber cycle for the formation of magnesium oxide.
Complete Figure 1 by writing the missing symbols on the appropriate energy levels. [3 marks]
Figure 1
*02*
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3 0 1 . 2 Table 1 contains some thermodynamic data.
Do not write outside the
box
Table 1
Enthalpy of formation for magnesium oxide Enthalpy of atomisation for magnesium First ionisation energy for magnesium Second ionisation energy for magnesium Bond dissociation enthalpy for oxygen First electron affinity for oxygen Second electron affinity for oxygen
Enthalpy change / kJ mol?1 ?602 +150 +736 +1450 +496 ?142 +844
Calculate a value for the enthalpy of lattice formation for magnesium oxide. [3 marks]
Enthalpy of lattice formation Turn over for the next question
kJ mol?1
6
*03*
Turn over
IB/M/Jun18/7405/1
4
Do not write outside the
box
0 2
Nitrogen and hydrogen were mixed in a 1:3 mole ratio and left to reach equilibrium in a flask at a temperature of 550 K. The equation for the reaction between nitrogen and hydrogen is shown.
N2(g) + 3H2(g) 2NH3(g)
0 2 . 1 When equilibrium was reached, the total pressure in the flask was 150 kPa and the mole fraction of NH3(g) in the mixture was 0.80
Calculate the partial pressure of each gas in this equilibrium mixture.
[3 marks]
Partial pressure of nitrogen Partial pressure of hydrogen Partial pressure of ammonia
0 2 . 2 Give an expression for the equilibrium constant (Kp) for this reaction. Kp
kPa kPa kPa
[1 mark]
*04*
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5 0 2 . 3 In a different equilibrium mixture, under different conditions, the partial pressures of
the gases are shown in Table 2.
Do not write outside the
box
Table 2
Gas Partial pressure / kPa
N2
1.20 ? 102
H2
1.50 ? 102
NH3
1.10 ? 103
Calculate the value of the equilibrium constant (Kp) for this reaction and give its units. [2 marks]
Kp
Units
0 2 . 4 The enthalpy change for the reaction is ?92 kJ mol?1
State the effect, if any, of an increase in temperature on the value of Kp for this reaction. Justify your answer.
[3 marks]
Effect on Kp
Justification
*05*
9 Turn over
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