Chemistry 120 B General Chemistry
Gibbs Free Energy
Die Energie der Welt ist konstant.
Die Entropie der Welt strebt einem Maximum zu. Rudolf Clausius
Suniverse = Ssystem + Ssurroundings
Suniverse > 0
CHEM 120B: Excel and Word Tutorials for Data Analysis and Lab Reports
1. Open Excel and depending on the version you have, it should open up a blank worksheet or you
will need to select Blank Worksheet. The worksheet should look as below. N
1. Draw the molecular orbital diagram for OF and OF-. What is the bond order? Is the molecule paramagnetic
or diamagnetic? Which bond is stronger? Explain your response
2. What is the hybridization of the central atom in XeF2? Show Lewis
There are four types of math problems presented here that can be used as methods for
solving different types of equilibrium problems. I hope you find them useful.
(2.0 x)(3.0 x)
(6.05.0x + x )
x 2 = 6.0x104
Review Activity: Exam 1
1. A colorless liquid, used as solvent, is believed to be one of the following:
a. n-butyl alcohol 0.810 g/mL
b. ethylene glycol 1.114 g/mL
c. isopropyl alcohol 0.784 g/mL
d. toluene 0.866 g/mL
To identify the substance, a chemist
For each of the following spontaneous processes, identify the signs of the specified
a) The reaction 2KClO3 s ! 2KCl s + 3O2 g which releases 78 kJ of heat
H > 0 OR H < 0
S > 0 OR S < 0
Ssurr > 0 OR Ssurr < 0
Electronegativity and Lewis Structures
Electronegativity: a measure of how much an atom attracts or pulls electrons from other
atoms bonded to it.
Lewis Structures: A two dimensional representation of molecular bonding
Chemical bonds occur by sharing of v
Laboratory Report Writing Guide
Title, Name, and Date: A cover page is not necessary, but these should be reported.
Abstract: Concisely (80-200 words) describe the purpose of the experiment, the principal results (actual
data), and major conclusions/inter
Chem 100 Exam 3 Study Guide: Chapters 5 and 6
Memorize Table 5.7 and be able to write formulas and names for ionic compounds containing
Summarize the unique properties of water and the molecular basis for them.
o Water is a liquid
Name Solution and Dilution Practice Sheet
1. Write the procedure for preparing a solution of known concentration. Draw glassware
H103. knw gmh-qj o. MN
m votumm ct. Plpk ass-(L 6L lute
we $\Mk h) M M'- 3
"h"' l ; the :59.
Name Concentration Practice Sheet
1. Dene molarity, molality, percent mass, ppm and ppb.
- .5 ,_ mobs. satay-ls; \CLU'I' 1 MKS Souc.
IMOQX I+~3 M L oQ So bah-pa YVLO 3 k3 0Q- Sch/0d"
_ n r? A
am TLLt jam/o w:7wtho"
2. Calculate M, % mass when
Name ' . Thermochemistry Enthalpy of Reaction '
1. Describe Enthalpy.
2. What is Hess law? Explain with an example.
3. Using standard enthalpy of formation table in your book calculate the AH for the reaction:
2N2(g) +502(g) . 2N205(g) AW"
Q Test or Critical Ratio
Chem. 63 (1951)
Test for large numbers of trials (Use 95% condence)
confidence 95% confidence . 99% condence
20 pts. Short Answer
What is heat and how does heat differ from thermal energy?
mock 18 YMMV
WWW WW3 (3 +l
Dene pressure. Right now.
(a) State Daltons law of partial pressures and explain what a mole fraction is. (b) Does mole
fraction have units?
Two fellows walk into a bar. The rst says I will have a glass of H20. The second says I will have a
glass of H20, too. The second fellow dies.
Harmful The scale in this system runs
from 0-4 with 0 e
CHEM 111A EXAM 1 FALL 2013
Whore. A"? "vs". er0 exam 30 ?.
Crosssection of computed hydrogen atom orbital (lIJU', 0, 4)2) for the 65(n = 6, 8 = 0, m = 0) orbital. Note that s orbitals,
though spherically symmetrical, have radially placed wave-
1. (10 pts) Potassium cyanide (KCN) reacts with acids to form a deadly poisonous gas, hydrogen
cyanide (HCN). The reaction is represented by the equation:
M ole/M assCmvers'ms
KCN(aq) + HC1(aq) -> KCl(aq) + HCN(g)
If a sample of 0.140 g of KC
WS 2: Le Chateliers Principle
Effect of Changes in Concentration (or Partial Pressure) Summary
When the equilibrium is disturbed, the ratio of products to reactants (called the reaction quotient, Q) changes
so that it is no longer equal to K
Integrated Rate Law
Unit of k
 = + 0
ln = + ln0
 vs. time
ln vs. time
#of bonding groups on
WS 5: Acid/Base Salts & Salt Hydrolysis
Cations are potential acids. List the non-acidic (neutral) cations.
2. Anions are potential bases. List the non-basic (neutral) anions.
3. Are solutions of the following salts acidic, basic, or
WS 4: Weak Acids & Weak Bases
Calculate the pH and % dissociation of a 0.15 M lactic acid solution. (HC3H5O3, Ka=1.38 X 10-4)
2. Calculate the pH and % dissociation of a 1.00 M phenol solution. (HC6H5O, Ka=1.3 X 10-10)
3. Calculate the pH
WS 3: pH and Strong Acids & Bases
Complete the following table, using proper sig figs, without using a calculator.
1.0 X 10-12
1.0 X 10-5
1.00 X 10-4
1.00 X 10-3
1.00 X 10-7
Strong Acids and S
# Lone Pairs
trigonal planar (120o)
trigonal pyramidal (~109.5o)
The filling sequence of the atomic orbitals is displayed in the periodic table. Filling proceeds
from left to right across each period (row)
Part 2. Characterizing the Attractive Forces
Attractive forces are often referred to as Intermolecular Forces because they occur between
(inter- is a prex meaning between) molecules not within molecules. Technically, ions are not
molecules, so the term at