Chem 6A Section D, 2011 (Sailor)
(1) Write your name in the blank titled "NAME" on the scantron form provided.
(2) Write your section number in the blank titled "SUBJECT" on the scantron form.
(3) Write your Student ID number in t
CHEM 6A - PRACTICE EXAM 2
November 21, 2012
1. In which one of the following processes is H = E?
A) 2 HI(g) H2(g) + I2(g) at atmospheric pressure.
B) Two moles of ammonia gas are cooled from 325C to 300C at 1.2 atm.
C) H2O(l) H2O(g) at 100
CHEM 6A ZIMMERMANN
REVIEW SESSION 2
Ionization Energy and Shell Structure
nth ionization energy, In: X(n-1)+ Xn+ + e
I1 increases with group number within a period and decreases with atomic number within a group
the successive ionization
1. Which of the following salts has the largest lattice energy; KBr, MgO, NaCl, or CaO?
2. Which of the following transitions in the hydrogen atom corresponds to emission of light with
the largest frequency?
Lower Division Chemistry
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Workshops begin Week 2 (10/13/14)
Please choose a workshop that corresponds to your professor
CHEM 6A Chapter 4 Extra Practice Problems
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BASIC LIGHT CALCULATIONS
1. Calculate the energy of a mole of photons that has a frequency of 7.42 x 1014 s-1. Is
this energy greater or less than that of light of 655-nm wavelength?
2. What is the fre
CHEM 6A Chapter 8 Extra Practice Problems with Answers
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1. Which of the species in the following list is trigonal planar?
3 and 5
2 and 4
1 and 3
CHEM 6A Chapter 6 Extra Practice Problems
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1. Consider the following species. Which contain an odd number of electrons?
(2) HO2(3) N2O
2 and 5
3 and 4
1, 3 and 4
CHEM 6A Chapter 5 Extra Practice Problems
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1. Which of the following electron configurations is correct for sulfur, (atomic number
CHEM 6A Chapter 3 Extra Practice Problems with Answers
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More Warnings (and More Warnings)
These are not all possible problem types from this chapter, just the problems that students
tend to struggle with. Make sure you look to the learning obje
CHEM 6A Chapter 2 Extra Practice Problems with Answers
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The same warnings apply to this problem set as to the problem set for chapter 1.
Be warned, also, that if you cant do these problems fairly easily, you have some work to do
CHEM 6A Chapter 7 Extra Practice Problems with Answers
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1. What is a correct Lewis dot representation of carbon monoxide?
2. Which of the following is the correct Lewis structure for OCS?
Points observed when we look at Schrodingers equation
1. Determined e- behave as waves
2. Occupy 3 dimensions
3. E is quantized (n=1,2,3)
Calculus is done, then you get the energy of e- orbitals
The energy of an electron of a hydrogen atom is
Molecules: 1 or more atoms combined
N2 is diatomic (composed of two of the same atom)
H2O: two hydrogens bonded with one oxygen
Molecule made or two elements that combine to form a
compound w diff chem props
Diatomics are all nonmetals and gases: Br2
Diagram of a Molecule
K2SO4 2 K atoms, 1 S atom, 4 O atoms in ONE
1 mole of this compound is Avogadros number, so 1
MOLE of the compound would be 2 moles of K, 1 mole of
S, 4 moles of O. Ratios remain constant
If I had one mole of FeCl3, how
Law of Constant Composition
No matter the source, a particular compound is composed
by the same elements in the same parts (fractions) by
Ex: A 5.64 g sample of a compound containing ion and
chloride and a total of 1.94 g of iron in the sample. Ca
By even observing things like electrons (using
radioactivity), you automatically disturb them and there
This leads to the Heisenberg Uncertainty Principle
(delta x)(delta p) = h/(4pi)
Example: Est uncertainty in position of
Metal + Nonmetal
For the cation (metal): all monoatomic cations take their
name from the metal from which they are derived
For the anion: monoatomic anions are named by adding
the suffix ide to the end of their original name
General Characteristics of the Elements
Metal conducts electricity, has luster, is malleable and
A nonmetal does not conduct electricity and is neither
malleable nor ductile (gases, solid)
A metalloid has the appearance and some props of a
Chapter 5: Quantum Theory and Atomic
The Many-Electron Atom
Bohr provided a great explanation of the
hydrogen atomic spectrum, however it cannot
be extended to atoms with more than one
CLASSIFICATION OF CHEMICAL REACTIONS
single replacement reaction
double replacement reaction
UCSD CHEM 6A SPRING 2015 Joerg Zimmermann
XY + Z
MN + OP
XZ + Y
MO + NP
CHEM 6A - PRACTICE EXAM 1
Oct. 18th, 2015
1. The speed of light is 3.0 x 108 m/s. How many milliseconds does it take for a light signal from earth
to reach and return from a satellite that is in orbit 30 miles above the earth?
A) 320 msec