Lecture 3211/21/05 2 seminars left

London Dispersion Forces: Induced dipole / Induced dipole Non-polar / non-polar interaction 0.05 – 40 KJ/mol

Hydrogen Bonding Kind of dipole-dipole interaction KJ/mol Mostly, X = F,N,O

p.490 Surface tension

Fig. 11-2, p.489

Fig. 11-3, p.490 Adhesive forces vs. Cohesive forces

Fig. 11-8, p.494

Changes of State Energy (ice melting) = mass x heat of Fusion For water: 333 J/g or 6 KJ/mol Energy (boiling) = mass x heat of Vaporization For water: 2256 J/g or KJ/mol

You put 1 L of water in a pan at 100˚C and the water evaporates. How much heat was needed to vaporize all of the water? ΔV vap ˚ = KJ/mol at 100˚C Density of water = g/mL at 100˚C

(Equilibrium) Vapor Pressure Liquid  Vapor Volatility: Greater the volatility  the bigger the vapor pressure

Fig. 11-4, p.491

If you put 2 L of water into a sealed room with a volume of L, will all of the water evaporate at 25˚C? Assume density of water is 1 g/mL and vapor pressure is atm.

Boiling Point