AQA A LEVEL CHEMISTRY PAPER 1 (7405/1) QP MERGED WITH MARK SCHEME JUNE 2024
A-level
CHEMIST RY
Paper 1 Inorganic and Physical Chemistry
Monday 10 June 2024 Morning Time allowed: 2 hours
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
TOTAL
AQA QP MERGED WITH MARK SCHEME 7405/1
, 2
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outside the
Answer all questions in the spaces provided. box
0 1 This question is about atomic structure.
0 1 . 1 In 1897 JJ Thomson discovered the electron. He suggested that atoms were
positively charged spheres with electrons embedded within them.
Figure 1 represents an atom using Thomson’s model.
Figure 1
Suggest the identity of this atom.
Give two differences between the modern model of an atom and the Thomson model
of an atom.
[3 marks]
Identity
Difference 1
Difference 2
IB/M/Jun24/7405/1
, 3
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outside the
0 1 . 2 Tellurium has a relative atomic mass of 127.6 box
Iodine has a relative atomic mass of 126.9
Define relative atomic mass.
Suggest one property of tellurium that justifies its position before iodine in the
modern Periodic Table.
[3 marks]
Definition
Justification
0 1 . 3 A sample of tellurium is analysed in a time of flight (TOF) mass spectrometer using
electron impact ionisation.
Give an equation, including state symbols, for this ionisation.
[1 mark]
Question 1 continues on the next page
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IB/M/Jun24/7405/1
, 4
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outside the
0 1 . 4 In the TOF mass spectrometer an ion of an isotope of tellurium, with mass number y, box
travels along a 1.25 m flight tube with a kinetic energy of 1.88 x 10–12 J
The ion takes 3.00 x 10–7 s to reach the detector.
KE = 1 mv2
2
KE = kinetic energy / J
m = mass / kg
v = speed / m s–1
Calculate the mass, in g, of 1 mole of these tellurium ions.
Use your answer to suggest the mass number y of the tellurium isotope.
The Avogadro constant, L = 6.022 × 1023 mol–1
[5 marks]
Mass g
Mass number y
IB/M/Jun24/7405/1
A-level
CHEMIST RY
Paper 1 Inorganic and Physical Chemistry
Monday 10 June 2024 Morning Time allowed: 2 hours
For Examiner’s Use
Question Mark
1
2
3
4
5
6
7
8
9
TOTAL
AQA QP MERGED WITH MARK SCHEME 7405/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 This question is about atomic structure.
0 1 . 1 In 1897 JJ Thomson discovered the electron. He suggested that atoms were
positively charged spheres with electrons embedded within them.
Figure 1 represents an atom using Thomson’s model.
Figure 1
Suggest the identity of this atom.
Give two differences between the modern model of an atom and the Thomson model
of an atom.
[3 marks]
Identity
Difference 1
Difference 2
IB/M/Jun24/7405/1
, 3
Do not write
outside the
0 1 . 2 Tellurium has a relative atomic mass of 127.6 box
Iodine has a relative atomic mass of 126.9
Define relative atomic mass.
Suggest one property of tellurium that justifies its position before iodine in the
modern Periodic Table.
[3 marks]
Definition
Justification
0 1 . 3 A sample of tellurium is analysed in a time of flight (TOF) mass spectrometer using
electron impact ionisation.
Give an equation, including state symbols, for this ionisation.
[1 mark]
Question 1 continues on the next page
Turn over ►
IB/M/Jun24/7405/1
, 4
Do not write
outside the
0 1 . 4 In the TOF mass spectrometer an ion of an isotope of tellurium, with mass number y, box
travels along a 1.25 m flight tube with a kinetic energy of 1.88 x 10–12 J
The ion takes 3.00 x 10–7 s to reach the detector.
KE = 1 mv2
2
KE = kinetic energy / J
m = mass / kg
v = speed / m s–1
Calculate the mass, in g, of 1 mole of these tellurium ions.
Use your answer to suggest the mass number y of the tellurium isotope.
The Avogadro constant, L = 6.022 × 1023 mol–1
[5 marks]
Mass g
Mass number y
IB/M/Jun24/7405/1
