Intermolecular forces

Read our general notes on Risk Assessment

Sorted FAQs on Intermolecular Forces

This topic has attracted quite a lot of questions to Re:act over the years. To help you find the ones of most interest to you more easily, whether they are about background theory or a particular experiment, we have sorted the FAQs under several headings below, with a direct link to each question and answer.

1. Type(s) of intermolecular force
•Main attraction in butanone, and in pentane?
•Can urea and propan-1-ol H-bond?
•Examples of substances with different forces
 
2. Solubility
•Which more soluble: ethanol or ethanoic acid?
•Why does HCl dissolve in water?
•Solubility of HCl vs solubility of ammonia
•More soluble: ethanol or ethanoic acid?
•Ammonia dissolving in water - what happens?
•Why I₂ soluble in hexane but not water, CHCl₃ soluble in propanone?
•Which more soluble in water: cyclohexanol or cyclohexene?
•Why are esters insoluble in water?
•Why do bromobutane and water not mix?
•Why can water and petrol not mix?
•Distinguishing pairs of substances by solubility
 
3. Properties
•Why HBr B.Pt. < B.Pt. HI
•Why sugar crystals softer than rock salt?
•Why does rock salt shatter when struck but sugar crystals are soft?
•Properties of a polymeric covalent molecule?
•Why does water have such a high M.Pt. and B.Pt.?
•Properties of low density poly(ethene) from structure?
•Why is B.Pt. CCl₄ > B.Pt. SiCl₄?
•Why is the boiling point of a mixture of propanone and trichloromethane higher than expected?
•How does position of OH affect B.Pt. in nitrophenols?
 
3. Miscellaneous
•What are van der Waals' radii?
•van der Waals' forces in CO₂ gas as well as solid?
•What determines strength of H-bonds, e.g. in amines?
•Shape of meniscus with hydrocarbons?
•Exam question: can a molecule have H-bonding?
•Why does NaOH get hot when it dissolves in water?

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updated: 08 August 2008