Intermolecular Interactions

5 5 440 240 min molh 2o min crical point where gas and

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Unformatted text preview: o: more kine+c energy to overcome IM forces. •  Larger hydrocarbons: larger viscosity –  More dispersion forces –  Polymers are an extreme manifesta+on Some aspects Capillary Ac+on •  Liquids adhere to (some) surfaces –  The liquid molecules also cohere •  This keeps the liquid together •  The effect is fluids flow up a tube Capillary Ac+on h = height of rise in m γ = surface tension 2γ cosθ h= ρgr 1.5 * 10 hwater ( m) ≈ r θ = contact angle fluid -container −5 ρ = density (1000kg/m3 ) g = gravity (9.8m/s2 ) r = radius of container (m) € !"#$%$&''()"*+(!"#(",(%+-#%*( 607-!!0/8(9+-#%*( '# "# € This is about ~1m of height from capillary action. $# %# The radius of xylem is about ~10um. &# !%# &# %# $# "# '# (&# !$# !"# .!"#$/01-23$&''()"*+()+#045+(!"#( (%# Vaporiza+on, Fusion, Calorimetry, Phase Diagrams PHASE CHANGES Vaporiza+on •  Vaporiza+on requires energy –  Gases have more KE than liquids •  Vaporiza+on cools the system down –  The system can be you Boiling Point •  Where the vapor pressure equals the ambient pressure. •  1atm H2O vapor occurs at 373.15K •  When kT>IM forces Normal Boiling Point Where the vapor pressure equals 1 atm. Phase Change Awesome #1 •  If the temperature does not change while the phase is changing, this is a...
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