LiquidsIntermolecular Forces and Boiling Point71Choose the best answerAmong substances A, B and C with IMF strength A < B < C, which has the lowest expected boiling point?AABBCCDAll are equal Like 0 Discuss 0Share
LiquidsEnthalpy of Vaporization72Choose the best answerThe molar enthalpy of vaporization of water at its normal boiling point is approximately:A40.7 kJ mol⁻¹B40.7 J mol⁻¹C4.07 kJ mol⁻¹D407 kJ mol⁻¹ Like 0 Discuss 0Share
LiquidsLiquid–Vapour Dynamic Equilibrium73Choose the best answerWhen evaporation and condensation occur at equal rates in a closed container:AThe liquid disappearsBDynamic equilibrium is establishedCBoiling starts automaticallyDVapour formation stops Like 0 Discuss 0Share
LiquidsBoiling Point and External Pressure74Choose the best answerCooking takes longer under reduced pressure because:AThe boiling point of water decreasesBThe boiling point of water increasesCWater cannot evaporateDHydrogen bonding disappears Like 0 Discuss 0Share
LiquidsHydrogen Bonding and Boiling Point75Choose the best answerThe anomalously high boiling points of compounds such as H₂O, HF and NH₃ are mainly due to:AMolecular massBHydrogen bondingCDensityDNumber of hydrogen atoms Like 0 Discuss 0Share