LECTURE9 - Midterm 1 Monday Apr 18th In class....

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1 Midterm 1 Monday Apr 18 th In class. Thermochemistry (chap 11) Liquids and Solids (chap 12) Solutions (chap 13) Sample exams on website – guide only Be early. Bring your student ID!! Bring your calculator (clear programmable ones) ! Closed book Solubility of Gases • Most gases are less soluble in water as temperature increases. – Fish like cold water – Air bubbles when water warms in saucepan. • In organic solvents the reverse is often true. There is no general rule. • Solubility of a gas increases with pressure. – (effect of P is much more than T) e.g. Bends – Excess N 2 released as bubbles in blood.
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2 Henry’s Law C = k P gas k = C P gas = 23.54 mL N 2 /L 1.00 atm = 23.54 mL N 2 /L/atm Solubility of gas in particular solvent at particular T: Partial P of gas above solution e.g. 23.54mL of pure Nitrogen is soluble in 1L of water at 0°C and 1 atm: k C P gas = = 100 mL N 2 /L = 4.25 atm 23.54 mL N 2 /L/atm To dissolve 100mL Nitrogen the pressure must be raised: It is known that water exposed to pure oxygen gas at 1atm and 0°C contains 48.9 mL O 2 /L.
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This note was uploaded on 07/09/2011 for the course CHE 2B 2B taught by Professor Tobyallen during the Spring '11 term at UC Davis.

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LECTURE9 - Midterm 1 Monday Apr 18th In class....

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