Prep for Chem 31 Test #2
9. Copper metal has a specific heat of 0.385 J/g C. Calculate the amount of heat required to raise the temperature of 22.8 g of Cu from 20.0C to 875C. 329 J 1.0 10-2 J 10.5 kJ 1.97 10-5 J 7.51 kJ 10. Calculate the amount of h
Chemistry Text Notes Chapter 5
Boyle's Law: V = k/p
Inverse Relationship Gas that obeys Boyle's Law is called an ideal gas.
Charles's Law: V = bT
Avogadro's Law: V = an
Gas at constant temperature and pressure,
Combusion of Butane
C4H10 FW 58.12 g/mol Combust 1.000 g, get 49.51 kJ heat Hc = -2878 kJ/mol
There are two isomers of butane:
Which is more the more stable position of atoms? (i.e., compare potential energy)
Ammonia to Nitrogen
NH3 (g) + C uO (s) -> N2 ( g) + Cu (s) + H2O (g) Does 1g of NH3 produce more (by weight) nitrogen or w a te r? 2 NH3 + 3 CuO - -> N 2 + 3 Cu + 3 H 2O
Each time you make 1 mol (28g) N2, get 3 mol (54g) H2O S o , h o w m u c h n itr o g
E = KE + PE (sum over all particles) When E in one system changes: E > 0 E < 0 (energy of syst goes up)
E from surroundings
(energy of syst goes down)
E into surroundings
How does E flow?
As work (w) or heat (q) E = q + w q > 0
Recall: Ideal Gas Law
PV = nRT
Should apply: When n/V is small When KE > PE (big T) Low pressure Ideal gases behave identically - they do not interact, by definition, and therefore do so identically. Kinetic energy only molecular detail, and depen
Molecules in a Container
Gas Takes shape Fills It Flows Liquid Takes shape May not fill Flows Solid Retains shape May not fill Doesnt flow
Can be the same molecules!
Molecules in a Container
Gas Takes shape Fills It Flows Liquid Takes shape May not
When Molecules Dissolve
Gain interaction of solutes and solvent. Lose interaction of solutes with each other. Lose interaction of solvent with self.
For ionic solutes, first two are most important. The dissolved species are (typically) the ions rath
Like Electron m/z
Separation by Mass (Neon)
Separation by Mass (Cu)
Atomic mass = 0.6909 * 63 + 0.3091 * 65 -63.6
Agrees with Cannizzaro-type work!
The Nature of Isotopes
What do you expect to be important? Charge is a good gues
Chem Final notes Week 11/5 Videos a. Valence electrons i. Valence electrons are all the electrons beyond the previous noble gas configuration ii. Most chemical bonding involves sharing, donating, or gaining valence electrons b. Lewis do structures i.
Chem exam ANY SLIDE IS FAIR GAME Quantum numbers n, l, m(l), m(s) N: principal QN - shell related to distance from nucleus - values: 1, 2, 3, 4. L: angular momentum QN - describes shape - values: n -1 0 - l=0; s - l=1; p - l=2; d - l=3; f - l=4; g
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Lab # 3: Spectrophotometric Determination of Concentration
Michael McLennon Ankur Gupta Melinda Box CHM 21 February 9, 2009
Lab # 3: Spectrophotometric Determination of Concentration Table 1.2 of Observed Absorbencies at Certain Wavelengths of the