LiquidsLiquid–Vapour Equilibrium66Choose the best answerAt the boiling point, the liquid and its vapour in equilibrium have the same:AAverage kinetic energyBPotential energyCMolecular separationDIntermolecular-force strength Like 0 Discuss 0Share
LiquidsStructure and Density of Ice67Choose the best answerIce at 0°C occupies more volume than liquid water mainly because of:AEmpty spaces in its open structureBIonic bondingCUnpaired electronsDDebye forces Like 0 Discuss 0Share
LiquidsBoiling Point and Atmospheric Pressure68Choose the best answerThe boiling point of water is lower at high altitude mainly because:AAtmospheric pressure is lowerBAtmospheric pressure is higherCWater becomes nonpolarDHydrogen bonding disappears Like 0 Discuss 0Share
LiquidsEvaporation69Choose the best answerA molecule can evaporate from a liquid surface when it:AHas sufficient kinetic energy to overcome intermolecular attractionsBHas zero kinetic energyCBecomes ionicDLoses all molecular motion Like 0 Discuss 0Share
LiquidsBoiling Point and External Pressure70Choose the best answerThe boiling point of a liquid increases when:AExternal pressure increasesBSurface area increasesCAmount of liquid increasesDContainer size increases Like 0 Discuss 0Share