Chemistry 114
Second Hour Exam
Name:____________
(4 points)
Please show all work for partial credit
1.(12 Points) Below is the phase diagram for a new material.
Based on this diagram
A. What is the Temperature and Pressure of the triple point of this material?
B. What is the Temperature and pressure of the Critical point of this material?
C. What is the Normal Freezing point of this material?
D. What is the Normal Boiling point of this material?
What is the physical form of this material at:
E. 100K, .1 atm?
F. 200K, 1.0 atm?
G. 300K, .1 atm?
H. 300K, 100 atm?
2. (12 points) Fill in the following table about types of solids
Type of Solid
Constituent particle
Type of attractive
force
Examples
Ionic crystal
molecules
covalent bonds
Fe, Mn, Cu etc.
Group 8A
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3. (12 points) The freezing point of nitrobenzene is 5.7oC and it has a freezing point
depression constant of 6.87 K@m-1. How many grams of C6H4Cl2, (a non-ionic solute)
will I have to dissolve in 1 kg of nitrobenzene to make the freezing point of the solution
+1oC?
4A. (8 points) I am going to mix .2 moles of benzene with .8 moles of toluene. If the
vapor pressure of pure benzene is 183 torr, and the vapor pressure of pure toluene is
59.2 torr, what is the vapor pressure of the solution? (Assume an ideal solution)
4B. (2 points) If the actual vapor pressure of this solution is higher that the number you
calculated above, is this a POSITIVE or a NEGATIVE deviation from Raoult’s Law?
(Circle one)
4C. (2 points)Based on the above deviation, are the solute-solvent interactions
STRONGER or WEAKER than the respective solvent-solvent and solute-solute
interactions (Circle one)?
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5. I have determined the initial rate for the reaction A+B6C under three different
conditions as shown in the data table below:
[A]
[B]
0.7
1
1
0.7
0.7
1.4
rate
0.018418087
0.0245
0.098
A. (3 points) Write the rate law equation for this reaction.
B. (3 points) What is the order parameter for A?
C. (3 points) What is the order parameter for B?
D. (3 points) What is the overall rate constant for this reaction?
6. Rather than using the method of initial rates, I wish to determine the kinetics of a
reaction by following the change in concentration over a 60 second time period. Below
is a table of the data I obtained.
Time (Seconds)
Concentration (mM)
0
10
20
30
40
50
60
10
8.19E+00
6.70E+00
5.49E+00
4.49E+00
3.68E+00
3.01E+00
Since this method requires a graphing analysis, I have plotted this data three different
ways as shown on the following page.
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6A. (4 points) Is this a zero, first or second order reaction?
B. (4 points) What is the rate constant for this reaction?
C. (4 points) Use the information from parts A and B to write the Rate Law equation for
this reaction.
7. (12 points) A reaction has a rate constant of 15 sec-1 at 25oC. What is the rate
constant at 100oC, given that the activation energy is 15 kJ/mol?
4
8. (12 points) Define the following terms:
Elementary step
Intermediate species
Steric factor
Catalyst
Half-life
First Order Reaction
5