lec7_whc

# lec7_whc - Exam Jan 29 Room Assignments Room 1051 SLB 1059...

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Exam Jan. 29; Room Assignments All other sections ( B01, B03, B05, B08, B10, B11, B13, B18, B19, BR0 ) meet in Sciences Lecture Hall Edna B06 2076 SLB Edna B02 2068 SLB James B15 2059 SLB James B09 2051 SLB Mateo B16 1076 SLB Mateo B12 1068 SLB Troy B20 1075 SLB Troy B04 1067 SLB Kelly B17 1059 SLB Kelly B07 1051 SLB TA Section Room

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Last Time • Phase diagrams and the Clausius – Clapeyron equation • Bonding • Simple unit cells, packing
Ch. 12 (last lecture): Phase Diagrams • Characterized by: – Triple point – solid, liquid, and gas coexist – Critical point – T above which no P can make a gas into a liquid – curves that summarize phase transitions for a substance as a function of P and T

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Solid structures, unit cells and atom packing; ch. 12 There are three particularly important concepts: 1) Unit cells 2) They can contain partial atoms. 3) The coordination number of an atom.

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1) Unit cells are the smallest repeatable unit that, when translated, gives the entire crystal structure unit cell
2) Unit cells can have parts of several atoms.

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2) C oordination N umber is the number of bonded atoms at a particular atom. Here, there are twelve bonded atoms. The CN is 12.
Find the density of Sodium. Metallic radius = 186 pm. Example 12E 22.9898 / Na M gm o l =

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Remember the Pythagorean Theorem for right triangles: c 2 = a 2 + b 2 , where c=hypotenuse, a, b are the lengths of the other two sides; those linked by a right angle. a c b c 2 = a 2 + b 2
Solution 12E Find the density of Na metal. Metallic radius = 186 pm. 10 32 9 3 23 23 23 3 43 41 8 6 429.55 4.2955 10 3 7.9257 10 22.9898 3.8176 10 6.022 10 2 / : 2 7.6353 10 963357.6 / Na atom Na atom rl pm lp m m VL m g mg atoms cell m m g m dg m V = × === × == × × × × = 0.963 g/mL Expt. 0.968g/mL at 293K c= l a = b = √2 ·

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Hess' Law can be used to determine the enthalpy holding a lattice together relative to gaseous ions.
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lec7_whc - Exam Jan 29 Room Assignments Room 1051 SLB 1059...

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