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A-level

CHEMISTRY

Paper 1 Inorganic and Physical Chemistry

June 2020 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.

*jun20 7405101*

IB/M/JUN20/E12 7405/1

For Examiner’s Use

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Answer all questions in the spaces provided.

This question is about lattice enthalpies.

. 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

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. Table 1 contains some thermodynamic data.

Table 1

Enthalpy change

/ kJ mol–1

Enthalpy of formation for magnesium oxide –602

Enthalpy of atomisation for magnesium +150

First ionisation energy for magnesium +736

Second ionisation energy for magnesium +1450

Bond dissociation enthalpy for oxygen +496

First electron affinity for oxygen –142

Second electron affinity for oxygen +844

Calculate a value for the enthalpy of lattice formation for magnesium oxide.

[3 marks]

Enthalpy of lattice formation kJ mol–1

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