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Intermolecular forcesEdexcel A-Level Chemistry: Mind map

What this mind map covers

  • Types of force
  • Hydrogen bonding
  • Water
  • Boiling trends
  • Solvents

Exam questions on Intermolecular forces

  1. Butane, pentane and hexane boil at about 0 °C, 36 °C and 69 °C respectively. An isomer of pentane, 2,2-dimethylpropane, boils at about 10 °C.
    Explain why the boiling temperature increases from butane to hexane.2 marks
  2. The boiling temperatures of the hydrogen halides are: HF 20 °C, HCl −85 °C, HBr −67 °C and HI −35 °C.
    Explain why the boiling temperature rises from HCl to HI, even though the bonds become less polar.2 marks
  3. Ice floats on liquid water. Water boils at 100 °C, whereas hydrogen sulfide, H₂S, which has a similar shape and more electrons, boils at about −60 °C.
    Explain why ice is less dense than liquid water.3 marks
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Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).