plumiIntermolecular forces and boiling temperatures: Edexcel International A Level Chemistry questions
Edexcel International A Level Chemistry past-paper questions on 7.1.3 Intermolecular forces and boiling temperatures, 2019–2025, with mark schemes and examiner’s reports where available.
Paper
All papers
Exam
All years
Calculations
Q23(b)(v)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ14(b)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ7(a)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFYour answerQ16(a)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ10(b)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ19(a)(i)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerQ4(a)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDFQ4(b)
The whole paper ↗Loading the start of the question…
Loading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerLoading the question…
Open the full PDFYour answerQ19(b)(ii)
The whole paper ↗
Loading the start of the question…
Loading the question…
Open the full PDF
All 48 questions on Intermolecular forces and boiling temperatures, as a list
- June 2025, AS Unit 1, Q23(b)(v) (2 marks): Ethene and poly(ethene) have different melting temperatures. Molecule Melting temperature (K) ethene 104.1 poly(ethene) 400 Explain why their melting temperatur
- June 2025, AS Unit 2, Q3 (1 mark): Which amine, with molecular formula C3H9N , has the lowest boiling temperature? A (CH3)3N B CH3CH2NHCH3 C CH3CH2CH2NH2 D CH3CH(NH2)CH3
- June 2025, AS Unit 2, Q14(b)(i) (4 marks): Explain the differences in the boiling temperatures of the Group 5 hydrides shown. Detailed descriptions of the intermolecular forces are not required. Hydride
- January 2025, AS Unit 1, Q10 (1 mark): Sulfur has a higher melting temperature than white phosphorus, P4. Which is a possible reason for this? A sulfur molecules have a greater permanent dipole than
- January 2025, AS Unit 2, Q7(a) (1 mark): Which is the best estimate for the boiling temperature of HBr? (1) A 59°C B –20°C C –67°C D –90°C
- January 2025, Unit 4, Q16(a) (2 marks): Explain why pentan-2-one has a lower boiling temperature than pentan‑2‑ol. (2)
- October 2024, AS Unit 1, Q10(b) (1 mark): The melting temperatures of these elements are shown in the table. Element Na Mg Al Si P S Cl Melting temperature / K 371 922 933 1683 317 392 172 Which of the
- October 2024, AS Unit 2, Q11 (1 mark): Which alkane has the highest boiling temperature? A hexane B pentane C 2-methylpentane D 2,3-dimethylbutane
- October 2024, AS Unit 2, Q19(a)(i) (2 marks): Describe how London forces arise. (2)
- October 2024, Unit 4, Q2 (1 mark): Which compound will have the highest boiling temperature? A CH3CH2CH2CH2CH3 B CH3CH2CH2CHO C CH3COCH2CH3 D CH3CH2COOH Use this space for any rough working. Anyt
- June 2024, AS Unit 2, Q4(a) (1 mark): Which isomer has the highest boiling temperature? (1) A B C D
- June 2024, AS Unit 2, Q4(b) (1 mark): Which compound has the highest boiling temperature? (1) A pentane B cyclopentane C butan‑1‑ol D butane‑1,4‑diol
- June 2024 (R), AS Unit 2, Q15 (1 mark): The compounds W, X, Y and Z have different boiling temperatures. CH3 CH3CH2CH2CH3 H3C C CH3 H Compound W Compound X CH3 H3C CH3 CH3CH2CH2CH2Br C Br Compound Y C
- October 2023, AS Unit 2, Q5 (1 mark): Which of these isoelectronic compounds would be expected to have the highest boiling temperature? A butan‑1‑ol B 2‑methylpropan‑1‑ol C 2‑methylpropan‑2‑ol D pen
- June 2023, AS Unit 2, Q4 (1 mark): Which of these alkanes would be expected to have the highest boiling temperature? A B C D
- June 2023, AS Unit 2, Q5 (1 mark): The boiling temperature of hexane is 69 °C and that of cyclohexane is 81 °C. The main reason that cyclohexane has a higher boiling temperature is that cyclohexa
- June 2023, AS Unit 2, Q6 (1 mark): The structures and boiling temperatures of butane and propanal are shown. Butane Propanal O CH2 CH3 C CH2 CH3 CH3 CH2 H Tb = 0 °C Tb = 49 °C The main reason tha
- June 2023, Unit 4, Q10 (1 mark): How do the boiling temperature and the solubility in water of butanoic acid compare with the values for hexane? Boiling temperature Solubility in water A lower
- January 2023, AS Unit 2, Q6 (1 mark): Which sequence shows the hydrogen halides in order of decreasing boiling temperature? A HF > HCl > HBr > HI B HF > HI > HBr > HCl C HI > HF > HCl > HBr D HI > H
- January 2023, AS Unit 2, Q19(b)(ii) (2 marks): Explain why alcohol B has a higher boiling temperature than alcohol A. (2)
- January 2023, Unit 4, Q13 (1 mark): Propanal has a much higher boiling temperature than butane even though both compounds have the same molar mass. The main reason for the difference in boiling te
- October 2022, AS Unit 2, Q9 (1 mark): Why is the boiling temperature of hydrogen iodide higher than that of hydrogen bromide? A hydrogen iodide has stronger London forces than hydrogen bromide B hyd
- October 2022, AS Unit 2, Q11 (1 mark): Which compound has the highest boiling temperature? OH A OH B C D Use this space for any rough working. Anything you write in this space will gain no credit.
- October 2022, AS Unit 2, Q21(a)(i) (2 marks): At room temperature and pressure, sulfur is a solid and oxygen a gas. Explain why sulfur and oxygen exist in different states by referring to the intermolecular
- October 2022, Unit 4, Q11 (1 mark): Which compound is both completely miscible in water and has a higher boiling temperature than water? A CH3COOH B CH3COCH3 C CH3CH2CH2CHO D CH3CH2COOCH2CH3
- June 2022, AS Unit 2, Q3 (1 mark): Which of these compounds would be expected to have the highest boiling temperature? A (CH3)3COH B CH3CH2CH2CH2OH C CH3CH2CH(CH3)2 D CH3CH2CH2CH2CH3 Use this spa
- June 2022, AS Unit 2, Q16(d) (4 marks): The graph shows the boiling temperatures of the hydrogen halides. 350 300 250 200 Boiling temperature / K 150 100 50 0 HI HF HCl HBr Explain the trend in the bo
- January 2022, AS Unit 2, Q5 (1 mark): Which sequence shows the molecules in order of increasing boiling temperature? A H2O < Br2 < Cl2 < CH4 B Br2 < CH4 < Cl2 < H2O C Cl2 < CH4 < H2O < Br2 D CH4 < C
- January 2022, AS Unit 2, Q8(a) (1 mark): Which of these alkanes has the highest boiling temperature? (1) A butane B hexane C pentane D propane
- January 2022, AS Unit 2, Q8(b) (1 mark): Which of these alkanes has the lowest boiling temperature? (1) A B C D
- January 2022, AS Unit 2, Q24(a) (3 marks): Urea has a melting temperature of 133 °C. Explain why this value is higher than expected for a relatively small molecule. (3)
- October 2021, AS Unit 2, Q6 (1 mark): Which of these isomers has the highest boiling temperature? A B C D Use this space for any rough working. Anything you write in this space will gain no credit.
- October 2021, AS Unit 2, Q16 (1 mark): Which row shows the hydrogen halides in order of increasing boiling temperature? Lowest Highest HI A HF HCl HBr HI B HBr HCl HF HI C HCl HBr HF HI D HF HBr HCl
- October 2021, AS Unit 2, Q20(c) (4 marks): The boiling temperatures of some halogenoalkanes are shown. Boiling temperature Halogenoalkane / °C 1-chloropropane 47 1-bromopropane 71 1-iodopropane 103 Expla
- June 2021, AS Unit 2, Q20(a) (6 marks): Some data for three small molecules are shown. Boiling temperature Molecule Mr / °C Fluorine 38.0 −188 Hydrogen chloride 36.5 −85 Methanol 32.0 65 Explain the l
- June 2021, AS Unit 2, Q20(c) (2 marks): Explain why bromine is a liquid but iodine is a solid at room temperature. Detailed explanations of the forces involved are not required. (2)
- January 2021, AS Unit 1, Q19(b)(i) (2 marks): Explain why PCl5 has a higher melting temperature than SbCl5 . (2)
- January 2021, AS Unit 2, Q2 (1 mark): Which of these isomers with the formula C8H18 has the lowest boiling temperature? A CH3CH(CH3)CH2CH2CH(CH3)CH3 B CH3CH(CH3)CH2CH2CH2CH2CH3 C CH3C(CH3)2CH2CH(CH3
- January 2021, AS Unit 2, Q5 (1 mark): The viscosities of four liquid organic compounds are compared by placing the liquids in separate identical tubes, each with an air bubble at the top. Air bubble
- January 2021, Unit 4, Q19(d) (6 marks): Explain, in terms of all the intermolecular forces involved, why butanal has a higher boiling temperature than pentane but a lower boiling temperature than prop
- October 2020, AS Unit 2, Q4 (1 mark): The skeletal formulae of three isomers are shown. X Y Z Which series shows the correct order of increasing boiling temperatures? A Y, X, Z B X, Y, Z C Y, Z, X D
- October 2020, AS Unit 2, Q13(b)(iii) (3 marks): Explain, with reference to their intermolecular forces, why the boiling temperatures of alkanes increase as the number of carbon atoms increases. A detailed des
- October 2020, Unit 4, Q17(d) (3 marks): State which one of the isomers A, E and F has the highest boiling temperature. Justify your answer. (3)
- January 2020, AS Unit 1, Q18(e) (2 marks): Chlorine is a gas at room temperature and pressure. Explain why chlorine has a low boiling temperature. (2)
- January 2020, AS Unit 2, Q5 (1 mark): Which compounds are arranged in order of decreasing boiling temperature? A CH3CH2CH2CH3 > CH3CH2CH2CH2CH3 > CH3CH2CH2CH2CH2CH3 B CH3CH2CH2CH2CH2CH3 > (CH3)2CHCH
- January 2020, AS Unit 2, Q11(b) (1 mark): How do the boiling temperatures of ethanol and chloroethane compare, and what is the reason for the difference? (1) Comparison of boiling Reason for the differe
- January 2020, AS Unit 2, Q16(a) (6 marks): The boiling temperatures of some isoelectronic hydrides are shown. Hydride CH4 NH3 H2O HF Boiling temperature / K 112 240 373 293 Explain the differences in the
- June 2019, AS Unit 2, Q14 (1 mark): Which of these isomers has the highest boiling temperature? Cl A B Cl C Cl Cl D Use this space for any rough working. Anything you write in this space will gain
Questions, mark schemes and examiner’s reports are © Pearson Edexcel, from their published past papers. Plumi isn’t affiliated with any exam board. Want whole papers? Edexcel International A Level Chemistry past papers.
The Plumi iPad app also offers exam-style questions with AI feedback on your handwritten working.