Pearson Edexcel Level 3 GCE
Monday 16 June 2025
Morning (Time: 1 hour 45 minutes) Paper
reference 9CH0/02
Chemistry
Advanced
PAPER 2: Advanced Organic and Physical Chemistry
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an
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answer, put a line through the box and then mark your new answer with a cross .
1 This question is about mass spectrometry.
(a) Which molecule would not give a molecular ion peak with m/z = 74?
(1)
A C2H5COOH
B CHOCOOH
C CH2(OH)COOH
D CH3COOCH3
(b) The fragmentation pattern in a mass spectrum can be used to distinguish
between structural isomers.
Which m/z peak would be present in the mass spectrum of propanal, CH3CH2CHO,
but not in the mass spectrum of propanone, CH3COCH3 ?
(1)
A 15
B 29
C 43
D 59
(Total for Question 1 = 2 marks)
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,2 Intermolecular forces affect the physical properties of compounds.
(a) Which of these isomers, with the formula C8H18 , will have the
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lowest boiling temperature?
(1)
A (CH3)2CHCH2C(CH3)3
B (CH3)2CHCH2CH(CH3)CH2CH3
C CH3CH2CH2C(CH3)2CH2CH3
D CH3CH2CH2CH2CH2CH2CH2CH3
(b) Pentan‑1‑ol and hexane have the same number of electrons but pentan‑1‑ol is
much less volatile than hexane.
Explain this difference in volatility.
(2)
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(c) Iodine is a solid at room temperature but on gentle heating it vaporises.
What bonds or forces are being broken?
(1)
A covalent bonds
B ionic bonds
C London forces
D permanent dipole‑dipole forces
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, (d) The boiling temperature of boron trichloride is 13 °C while that of
phosphorus trichloride is 76 °C.
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Explain, in terms of the shapes of the molecules, why phosphorus trichloride has a
much higher boiling temperature, although both compounds have polar bonds.
Do not consider differences in London forces.
(4)
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(Total for Question 2 = 8 marks)
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Monday 16 June 2025
Morning (Time: 1 hour 45 minutes) Paper
reference 9CH0/02
Chemistry
Advanced
PAPER 2: Advanced Organic and Physical Chemistry
, Answer ALL questions.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 This question is about mass spectrometry.
(a) Which molecule would not give a molecular ion peak with m/z = 74?
(1)
A C2H5COOH
B CHOCOOH
C CH2(OH)COOH
D CH3COOCH3
(b) The fragmentation pattern in a mass spectrum can be used to distinguish
between structural isomers.
Which m/z peak would be present in the mass spectrum of propanal, CH3CH2CHO,
but not in the mass spectrum of propanone, CH3COCH3 ?
(1)
A 15
B 29
C 43
D 59
(Total for Question 1 = 2 marks)
3
*P77833A0332* Turn over
,2 Intermolecular forces affect the physical properties of compounds.
(a) Which of these isomers, with the formula C8H18 , will have the
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
lowest boiling temperature?
(1)
A (CH3)2CHCH2C(CH3)3
B (CH3)2CHCH2CH(CH3)CH2CH3
C CH3CH2CH2C(CH3)2CH2CH3
D CH3CH2CH2CH2CH2CH2CH2CH3
(b) Pentan‑1‑ol and hexane have the same number of electrons but pentan‑1‑ol is
much less volatile than hexane.
Explain this difference in volatility.
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
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(c) Iodine is a solid at room temperature but on gentle heating it vaporises.
What bonds or forces are being broken?
(1)
A covalent bonds
B ionic bonds
C London forces
D permanent dipole‑dipole forces
4
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, (d) The boiling temperature of boron trichloride is 13 °C while that of
phosphorus trichloride is 76 °C.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Explain, in terms of the shapes of the molecules, why phosphorus trichloride has a
much higher boiling temperature, although both compounds have polar bonds.
Do not consider differences in London forces.
(4)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
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(Total for Question 2 = 8 marks)
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