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Cambridge A-Level MathsIGCSE MathematicsA-Level Further MathsIGCSE Additional MathsCambridge AS-Level MathsEdexcel A-Level Maths40+ countriesSince 2010Cambridge A-Level MathsIGCSE MathematicsA-Level Further MathsIGCSE Additional MathsCambridge AS-Level MathsEdexcel A-Level Maths40+ countriesSince 2010Cambridge A-Level MathsIGCSE MathematicsA-Level Further MathsIGCSE Additional MathsCambridge AS-Level MathsEdexcel A-Level Maths40+ countriesSince 2010
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Cambridge mark scheme
9701_s22_ms_22.pdf
Chemistry 9701/22 · May/June 2022Q4 (b)(ii)

Explain why the boiling point of HF is higher than the boiling point of HCl.[4]

Mark Scheme Answer:

• hydrogen bonding ✓• between H and F / lone pair on F ✓• HCl weaker van der Waals / dipole-dipole ✓• more energy to overcome ✓

The student thinks:

"OK... hydrogen bonding. Got it. But what exactly do I write in the exam to get all 4 marks? How specific do I need to be?"

Edveera AI breakdown
E
Edveera Analysis
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HF has hydrogen bonding between the H of one molecule and the lone pair on F of another. HCl only has weaker dipole-dipole / van der Waals forces. More energy is required to overcome the stronger H-bonds in HF, so it has a higher boiling point.

Hydrogen bondingLone pair on FWeaker forces in HClMore energy needed
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83%78%71%64%58%AI
Integration by Substitution83%
Differential Equations78%
Vectors & 3D Geometry71%
Complex Numbers64%
Statistics & Probability58%

Integration by Substitution appears in 83% of A-Level Mathematics papers since 2010. If you haven't mastered it, you're gambling with marks on every paper.

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