AQA A-LEVEL CHEMISTRY PAPER 1 INORGANIC AND PHYSICAL
CHEMISTRY QP 2021
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
• the Periodic Table/Data Booklet, provided as an insert (enclosed)
• a ruler with millimetre measurements Question Mark
• a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write outside
6
the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• All working must be shown. 9
• Do all rough work in this book. Cross through any work you do not
want to be marked. TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 105.
*JUN217405101*
IB/M/Jun21/E9 7405/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 This question is about enthalpy changes for calcium chloride and
magnesium chloride.
0 1 . 1 State the meaning of the term enthalpy change.
[1 mark]
Figure 1 shows an incomplete Born–Haber cycle for the formation of calcium chloride.
Figure 1
0 1 . 2 Complete Figure 1 by writing the formulas, including state symbols, of the
appropriate species on each of the three blank lines.
[3 marks]
*02*
IB/M/Jun21/7405/1
, 3
Do not write
outside the
0 1 . 3 Table 1 shows some enthalpy data. box
Table 1
Enthalpy change
/ kJ mol–1
Enthalpy of formation of calcium chloride –795
Enthalpy of atomisation of calcium +193
First ionisation energy of calcium +590
Second ionisation energy of calcium +1150
Enthalpy of atomisation of chlorine +121
Electron affinity of chlorine –364
Use Figure 1 and the data in Table 1 to calculate a value for the
enthalpy of lattice dissociation of calcium chloride.
[2 marks]
Enthalpy of lattice dissociation kJ mol–1
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun21/7405/1
, 4
Do not write
outside the
0 1 . 4 Magnesium chloride dissolves in water. box
Give an equation, including state symbols, to represent the process that occurs when
the enthalpy of solution of magnesium chloride is measured.
[1 mark]
0 1 . 5 Table 2 shows some enthalpy data.
Table 2
Enthalpy change
/ kJ mol–1
Enthalpy of lattice dissociation of MgCl2 +2493
Enthalpy of hydration of Mg2+(g) –1920
Enthalpy of hydration of Cl–(g) –364
Use your answer to Question 01.4 and the data in Table 2 to calculate a value for the
enthalpy of solution of magnesium chloride.
[2 marks]
Enthalpy of solution kJ mol–1
0 1 . 6 The enthalpy of hydration of Ca2+(g) is –1650 kJ mol–1
Suggest why this value is less exothermic than that of Mg2+(g)
[2 marks]
11
*04*
IB/M/Jun21/7405/1
CHEMISTRY QP 2021
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
A-level
CHEMISTRY
Paper 1 Inorganic and Physical Chemistry
Time allowed: 2 hours
Materials
For this paper you must have: For Examiner’s Use
• the Periodic Table/Data Booklet, provided as an insert (enclosed)
• a ruler with millimetre measurements Question Mark
• a scientific calculator, which you are expected to use where appropriate. 1
2
Instructions
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions. 5
• You must answer the questions in the spaces provided. Do not write outside
6
the box around each page or on blank pages.
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• All working must be shown. 9
• Do all rough work in this book. Cross through any work you do not
want to be marked. TOTAL
Information
• The marks for questions are shown in brackets.
• The maximum mark for this paper is 105.
*JUN217405101*
IB/M/Jun21/E9 7405/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 This question is about enthalpy changes for calcium chloride and
magnesium chloride.
0 1 . 1 State the meaning of the term enthalpy change.
[1 mark]
Figure 1 shows an incomplete Born–Haber cycle for the formation of calcium chloride.
Figure 1
0 1 . 2 Complete Figure 1 by writing the formulas, including state symbols, of the
appropriate species on each of the three blank lines.
[3 marks]
*02*
IB/M/Jun21/7405/1
, 3
Do not write
outside the
0 1 . 3 Table 1 shows some enthalpy data. box
Table 1
Enthalpy change
/ kJ mol–1
Enthalpy of formation of calcium chloride –795
Enthalpy of atomisation of calcium +193
First ionisation energy of calcium +590
Second ionisation energy of calcium +1150
Enthalpy of atomisation of chlorine +121
Electron affinity of chlorine –364
Use Figure 1 and the data in Table 1 to calculate a value for the
enthalpy of lattice dissociation of calcium chloride.
[2 marks]
Enthalpy of lattice dissociation kJ mol–1
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun21/7405/1
, 4
Do not write
outside the
0 1 . 4 Magnesium chloride dissolves in water. box
Give an equation, including state symbols, to represent the process that occurs when
the enthalpy of solution of magnesium chloride is measured.
[1 mark]
0 1 . 5 Table 2 shows some enthalpy data.
Table 2
Enthalpy change
/ kJ mol–1
Enthalpy of lattice dissociation of MgCl2 +2493
Enthalpy of hydration of Mg2+(g) –1920
Enthalpy of hydration of Cl–(g) –364
Use your answer to Question 01.4 and the data in Table 2 to calculate a value for the
enthalpy of solution of magnesium chloride.
[2 marks]
Enthalpy of solution kJ mol–1
0 1 . 6 The enthalpy of hydration of Ca2+(g) is –1650 kJ mol–1
Suggest why this value is less exothermic than that of Mg2+(g)
[2 marks]
11
*04*
IB/M/Jun21/7405/1
