LiquidsLiquid–Vapour Dynamic Equilibrium121Choose 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
LiquidsHydrogen Bonding and Volume Contraction122Choose the best answerWhen 50 mL ethanol is mixed with 50 mL water, the final volume may be less than 100 mL mainly because of:AVapour pressureBHydrogen bondingCBoilingDChemical reaction Like 0 Discuss 0Share
LiquidsAnomalous Behaviour of Water123Choose the best answerWater shows anomalous expansion when cooled from:A100°C to 0°CB4°C to 0°CC10°C to 4°CD0°C to −10°C Like 0 Discuss 0Share
LiquidsBoiling and Latent Heat of Vaporization124Choose the best answerAt constant external pressure, once a pure liquid is boiling, additional heat mainly:ARaises its boiling temperature continuouslyBConverts liquid into vapourCLowers its vapour pressureDDecreases molecular energy Like 0 Discuss 0Share
LiquidsHydrogen Bonding and Boiling Point125Choose 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 1 Discuss 0Share