Exam III Form A
November 9, 2010
IMPORTANT: On the scantron (answer sheet), you MUST clearly fill your name, your
student number, section number, and test form (white cover = test form A; yellow
cover = test form B).
Chemistry 112 Exam III Form A April 8, 2008
IMPORTANT: On the scantron (answer sheet), you MUST clearly fill your name, your student number, section number, and test form (white cover = test form A; yellow cover = test form B). Use a #2 p
CRITERIA FOR SPONTANEITY
Exothermic reactions (H <0) are usually spontaneous.
Ssystem + Ssurroundings > 0
We need a new state function that can predict spontaneity.
This is called the Free Energy:
G = H TS
T is absolute t
Thermodynamics Entropy and Spontaneity
Kinetics vs. Thermodynamics
Rates of chemical reactions are controlled by
activation energy lower Ea, faster rate.
Collision frequency; collisions, rate
Equilibrium is reached
Arranged by ATOMIC NUMBER
This is the nmber of protons in the nucleus
This is also the number of electrons in the atom.
ATOMIC WEIGHT is the average weight of the atom in amu
(atomic mass units => g/mole)
All atoms of a given eleme
Structure of atom
Products of Nuclear Decay
Rate of nuclear decay
Nuclear Binding energy
Review Structure of atom
Bonding in molecules and solids
Where were heading: The chemistry of modern materials
(extended solids), after a brief look at some key aspects of
bonding in molecules (molecular orbitals)
How are atoms held together in molecules and solids?
How does this
Ore: deposit that contains enough metal that we can
Most metals are found in minerals.
Names of minerals are usually based on the location of
Other minerals are named after their colors: malachite
INTEGRATED RATE LAW
So far we have used differential rate laws
rate = -[A]/t = k[A]x (a differential eqn)
Integration gives [A] as a function of t (more
1st order reaction (x = 1):
ln([A]0/[A]) = 2.303 log ([A]0/[A]) = kt
Chemistry of the Elements, Mostly Non-Metals
Chemistry of the Elements
Chemistry of the Main Group elements
Occurrence of elements
Where in nature
State of elements
Isolation and purification
Chem 112 Spring 2010 Exam 3 Answer Key 4 /6 /1 0
F o rm A
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. D A D B D D C A D C A A C D E B B A D B A E A C E
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15
CHEMISTRY 112 EXAM 3
April 6, 2010
-1. Which one of the following statements is true?
All exothermic reactions are spontaneous.
All reactions with a positive increase in entropy are spontaneous.
All spontaneous reactions are fast.