Which statement correctly describes the changes occurring at the molecular level and the associated thermodynamic changes when a sample of liquid propan-1-ol (CH3CH2CH2OHCH_3CH_2CH_2OHCH3CH2CH2OH) is vaporised?
Covalent O−HO-HO−H and C−OC-OC−O bonds are broken, resulting in an increase in the enthalpy of the system.
Intermolecular hydrogen bonds and London forces are overcome, resulting in an increase in the enthalpy of the system.
Hydrogen bonds are broken in an exothermic process, resulting in a decrease in the enthalpy of the system.
Only London forces are overcome, resulting in a decrease in the entropy of the system.
54 exam-style questions on AQA A Level Chemistry Bonding, covering Ionic bonding, Nature of covalent and dative covalent bonds, Metallic bonding, Bonding and physical properties, Shapes of simple molecules and ions, Bond polarity, and Forces between molecules. Each one has a worked solution and a mark scheme showing where the marks go.