Name (please print CLEARLY)
Chemistry 1304.001
Seat No.
February 8, 2017
Exam 1 (100 points)
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
1. (3 points) Three important factors that affect the rate of a reaction are:
,
, and
.
2. (4 points) Of the substances listed below,
should be the most soluble in
hexane (CH3CH2CH2CH2CH2CH3) and
CH3CH2Cl
CH3CH2OH
is the most soluble in water.
CH3OCH3
CH3CH2CH3
3. (2 points) In water, soap molecules aggregate into small particles called
4.
(3 points)
.
Of the following aqueous solutions, underline the one with the lowest osmotic pressure.
1.0 M HNO3
1.0 M Mg(NO3)2
1.0 M HNO2
1.0 M KNO2
5. (4 points) The reaction A + 2 B → products was found to have the rate law: rate = k[A]2[B]. When
the concentration of A is doubled and the concentration of B is tripled, the rate of the reaction will
increase by a factor of
6. (9 points) SHOW ALL WORK as above! What is the molarity of a solution that is 26.0 % by mass
phosphoric acid (H3PO4), molar mass, 98.0) and that has a density of 1.155 g/mL?
7. (9 points) SHOW ALL WORK! The vapor pressure of water at 20 °C is 17.4 mmHg. What is the vapor
pressure of water over a solution prepared from 2.00 x 102 g of sucrose (C12H22O11, molar mass,
342) and 2.50 x 102 g of water?
page 2
8. (9 points) A solution contains a mixture of pentane and hexane at room temperature. the solution has
a vapor pressure of 258 mmHg. Pure pentane and hexane have vapor pressures of 425 and 151
mmHg, respectively. at room temperature. Assuming ideal behavior, what is the mole fraction of
each component in the solution
9. The data below were obtained by repeating the following reaction four times.
2 NO2 (g) + F2 (g) → 2 NO2F (g)
a.
Expt
[NO2]
[F2]
Initial Rate (M/s)
(1)
0.100
0.100
0.026
(2)
0.200
0.100
0.051
(3)
0.200
0.200
0.103
(4)
0.400
0.400
0.411
Determine the rate law for this reaction. SHOW ALL WORK as if you were teaching it
in class – even if you can "look at it and get the answer"!
(7 points)
b.
(4 points)
c.
(2 points)
What is the value of the rate constant, k, including units? SHOW ALL WORK CLEARLY!
The overall order of the reaction is
page 3
10. (5 points) In the graph below the x axis is time in seconds and the y axis is concentration of MX in
moles/L for the reaction MX → M+ + X-. Write the rate law for this reaction.
11. (9 points) SHOW ALL WORK! When a 100 mL aqueous solution contains 0.102 g of a compound
with an empirical formula of C8H13O7, the osmotic pressure is 28.1 mmHg at 20 °C. What is the
molecular formula of the compound?
12. (4 points) Label each box in the energy profile of
a reaction with the appropriate LETTER.
b. reactants
c. products
Energy
a. activation energy (Ea)
d. enthalpy of reaction (∆Hrexn)
Reaction progress
page 4
13. Studies of the decomposition of peroxyactyl nitrate, an air pollutant, resulted in the following data:
0 °C, k = 5.6 x 10-6 s-1; 10 °C, k = 3.2 x 10-5 s-1; 20 °C, k = 1.6 x 10-4 s-1; 30 °C, k = 7.6 x 10-4 s-1.
-7
a. (6 points) In the graph shown
below, define the axis labels
A and B.
axis A =
-8
-9
axis B =
-10
-11
-12
-13
0.0033 0.0033 0.0034 0.0035 0.0035 0.0036 0.0036 0.0037 0.0037
B
b. (4 points) Write the equation for the plot?
c.
(4 points)From
c.
(4 points)
what feature of the graph can activation energy, Ea, be determined? Give a specific
formula for this feature, not a only a single word answer. [Note: This answer is not the same as
the one above.]
What is the half-life of the decomposition at 30 °C. SHOW ALL WORK. (4 points)
14. (8 points) The half-life for the radioactive decay of U-238 is 4.5 billion years (4.5 x 109) and is
independent of initial concentrations. If a sample of U-238 initially contained 1.5 x 1018 atoms when
the universe was formed 13.8 billion years ago, how many U-238 atoms does it contain today?
Name (please print CLEARLY)
Chemistry 1304.001
Seat No.
February 8, 2017
Exam 1 (100 points)
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
Date
1. (3 points) Three important factors that affect the rate of a reaction are:
,
, and
.
2. (4 points) Of the substances listed below,
should be the most soluble in
hexane (CH3CH2CH2CH2CH2CH3) and
CH3CH2Cl
CH3CH2OH
is the most soluble in water.
CH3OCH3
CH3CH2CH3
3. (2 points) In water, soap molecules aggregate into small particles called
4.
(3 points)
.
Of the following aqueous solutions, underline the one with the lowest osmotic pressure.
1.0 M HNO3
1.0 M Mg(NO3)2
1.0 M HNO2
1.0 M KNO2
5. (4 points) The reaction A + 2 B → products was found to have the rate law: rate = k[A]2[B]. When
the concentration of A is doubled and the concentration of B is tripled, the rate of the reaction will
increase by a factor of
6. (9 points) SHOW ALL WORK as above! What is the molarity of a solution that is 26.0 % by mass
phosphoric acid (H3PO4, molar mass, 98.0) and that has a density of 1.155 g/mL?
7. (9 points) SHOW ALL WORK! The vapor pressure of water at 20 °C is 17.4 mmHg. What is the vapor
pressure of water over a solution prepared from 2.00 x 102 g of sucrose (C12H22O11, molar mass,
342) and 2.50 x 102 g of water?
page 2
8. (9 points) A solution contains a mixture of pentane and hexane at room temperature. the solution has
a vapor pressure of 258 mmHg. Pure pentane and hexane have vapor pressures of 425 and 151
mmHg, respectively. at room temperature. Assuming ideal behavior, what is the mole fraction of
each component in the solution
9. The data below were obtained by repeating the following reaction four times.
2 NO2 (g) + F2 (g) → 2 NO2F (g)
a.
Expt
[NO2]
[F2]
Initial Rate (M/s)
(1)
0.100
0.100
0.026
(2)
0.200
0.100
0.051
(3)
0.200
0.200
0.103
(4)
0.400
0.400
0.411
Determine the rate law for this reaction. SHOW ALL WORK as if you were teaching it
in class – even if you can "look at it and get the answer"!
(7 points)
b.
(4 points)
c.
(2 points)
What is the value of the rate constant, k, including units? SHOW ALL WORK CLEARLY!
The overall order of the reaction is
page 3
10. (5 points) In the graph below the x axis is time in seconds and the y axis is concentration of MX in
moles/L for the reaction MX → M+ + X-. Write the rate law for this reaction.
11. (9 points) SHOW ALL WORK! When a 100 mL aqueous solution contains 0.102 g of a compound
with an empirical formula of C8H13O7, the osmotic pressure is 28.1 mmHg at 20 °C. What is the
molecular formula of the compound?
12. (4 points) Label each box in the energy profile of
a reaction with the appropriate LETTER.
b. reactants
c. products
Energy
a. activation energy (Ea)
d. enthalpy of reaction (∆Hrexn)
Reaction progress
page 4
13. Studies of the decomposition of peroxyactyl nitrate, an air pollutant, resulted in the following data:
0 °C, k = 5.6 x 10-6 s-1; 10 °C, k = 3.2 x 10-5 s-1; 20 °C, k = 1.6 x 10-4 s-1; 30 °C, k = 7.6 x 10-4 s-1.
-7
a. (6 points) In the graph shown
below, define the axis labels
A and B.
axis A =
-8
-9
axis B =
-10
-11
-12
-13
0.0033 0.0033 0.0034 0.0035 0.0035 0.0036 0.0036 0.0037 0.0037
B
b. (4 points) Write the equation for the plot?
c.
(4 points)From
c.
(4 points)
what feature of the graph can activation energy, Ea, be determined? Give a specific
formula for this feature, not a only a single word answer. [Note: This answer is not the same as
the one above.]
What is the half-life of the decomposition at 30 °C. SHOW ALL WORK. (4 points)
14. (8 points) The half-life for the radioactive decay of U-238 is 4.5 billion years (4.5 x 109) and is
independent of initial concentrations. If a sample of U-238 initially contained 1.5 x 1018 atoms when
the universe was formed 13.8 billion years ago, how many U-238 atoms does it contain today?
Name (please print CLEARLY)
Chemistry 1304.001
Seat No.
February 8, 2017
Exam 1 (100 points)
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
1.
Date
(4 points)
Of the substances listed below,
water and
CH3CH2Cl
should be the most soluble in
is the most soluble in hexane (CH3CH2CH2CH2CH2CH3).
CH3CH2OH
CH3OCH3
CH3CH2CH2CH3
2. (3 points) Three important factors that affect the rate of a reaction are:
, and
,
.
3.
(2 points)
In water, soap molecules aggregate into small particles called
.
4.
(4 points)
The reaction A + 2 B → products was found to have the rate law: rate = k[A]2[B]. When
the concentration of A is tripled and the concentration of B is doubled, the rate of the reaction will
increase by a factor of
5. (3 points) Of the following aqueous solutions, underline the one with the lowest osmotic pressure.
1.0 M HNO2.
1.0 M Mg(NO3)2
1.0 M KNO2
1.0 M HNO3
6. (9 points) SHOW ALL WORK! When a 100 mL aqueous solution contains 0.102 g of a compound
with an empirical formula of C8H13O7, the osmotic pressure is 28.1 mmHg at 20 °C. What is the
molecular formula of the compound?
page 2
7. The data below were obtained by repeating the following reaction four times.
2 NO2 (g) + F2 (g) → 2 NO2F (g)
a.
8.
Expt
[NO2]
[F2]
Initial Rate (M/s)
(1)
0.100
0.100
0.026
(2)
0.200
0.100
0.051
(3)
0.200
0.200
0.103
(4)
0.400
0.400
0.411
Determine the rate law for this reaction. SHOW ALL WORK as if you were teaching it
in class – even if you can "look at it and get the answer"!
(7 points)
b.
(4 points)
c.
(2 points)
What is the value of the rate constant, k, including units? SHOW ALL WORK CLEARLY!
The overall order of the reaction is
The half-life for the radioactive decay of U-238 is 4.5 billion years (4.5 x 109) and is
independent of initial concentrations. If a sample of U-238 initially contained 2.5 x 1018 atoms when
the universe was formed 15.8 billion years ago, how many U-238 atoms does it contain today?
(8 points)
page 3
9. (4 points) Label each box in the energy profile of
a reaction with the appropriate LETTER.
Energy
a. enthalpy of reaction (∆Hrexn)
b. products
c. reactants
d. activation energy (Ea)
Reaction progress
10. Studies of the decomposition of peroxyactyl nitrate, an air pollutant, resulted in the following data:
0 °C, k = 5.6 x 10-6 s-1; 10 °C, k = 3.2 x 10-5 s-1; 20 °C, k = 1.6 x 10-4 s-1; 30 °C, k = 7.6 x 10-4 s-1.
-7
a. (6 points) In the graph shown
below, define the axis labels
A and B.
axis A =
-8
-9
axis B =
-10
-11
-12
-13
0.0033 0.0033 0.0034 0.0035 0.0035 0.0036 0.0036 0.0037 0.0037
B
b. (4 points) Write the equation for the plot?
c.
(4 points)From
what feature of the graph can activation energy, Ea, be determined? Give a specific
formula for this feature, not a only a single word answer. [Note: This answer is not the same as
the one above.]
c.
(4 points)
What is the half-life of the decomposition at 30 °C. SHOW ALL WORK. (4 points)
page 4
11. (5 points) In the graph below the x axis is time in seconds and the y axis is concentration of MX in
moles/L for the reaction MX → M+ + X-. Write the rate law for this reaction.
12. (9 points) A solution contains a mixture of pentane and hexane at room temperature. the solution has
a vapor pressure of 358 mmHg. Pure pentane and hexane have vapor pressures of 425 and 151
mmHg, respectively. at room temperature. Assuming ideal behavior, what is the mole fraction of
each component in the solution
13. (9 points) SHOW ALL WORK as above! What is the molarity of a solution that is 26.0 % by mass
phosphoric acid (H3PO4), molar mass, 98.0) and that has a density of 1.155 g/mL?
14. (9 points) SHOW ALL WORK! The vapor pressure of water at 20 °C is 17.4 mmHg. What is the vapor
pressure of water over a solution prepared from 3.00 x 102 g of sucrose (C12H22O11, molar mass,
342) and 4.50 x 102 g of water?
Name (please print CLEARLY)
Chemistry 1304.001
Seat No.
February 8, 2017
Exam 1 (100 points)
On my honor, I have neither given nor received unauthorized aid on this exam.
Signed
1.
Date
(4 points)
Of the substances listed below,
should be the most soluble in
water hexane (CH3CH2CH2CH2CH2CH3) and
is the most soluble in
hexane (CH3CH2CH2CH2CH2CH3).
CH3CH2Cl
CH3CH2OH
CH3OCH3
CH3CH2CH2CH3
2. (3 points) Three important factors that affect the rate of a reaction are:
, and
,
.
3.
(2 points)
In water, soap molecules aggregate into small particles called
.
4.
(4 points)
The reaction A + 2 B → products was found to have the rate law: rate = k[A]2[B]. When
the concentration of A is tripled and the concentration of B is doubled, the rate of the reaction will
increase by a factor of
5. (3 points) Of the following aqueous solutions, underline the one with the lowest osmotic pressure.
1.0 M HNO2.
1.0 M Mg(NO3)2
1.0 M KNO2
1.0 M HNO3
6. (9 points) SHOW ALL WORK! When a 100 mL aqueous solution contains 0.102 g of a compound
with an empirical formula of C8H13O7, the osmotic pressure is 28.1 mmHg at 20 °C. What is the
molecular formula of the compound?
page 2
7. The data below were obtained by repeating the following reaction four times.
2 NO2 (g) + F2 (g) → 2 NO2F (g)
a.
8.
Expt
[NO2]
[F2]
Initial Rate (M/s)
(1)
0.100
0.100
0.026
(2)
0.200
0.100
0.051
(3)
0.200
0.200
0.103
(4)
0.400
0.400
0.411
Determine the rate law for this reaction. SHOW ALL WORK as if you were teaching it
in class – even if you can "look at it and get the answer"!
(7 points)
b.
(4 points)
c.
(2 points)
What is the value of the rate constant, k, including units? SHOW ALL WORK CLEARLY!
The overall order of the reaction is
The half-life for the radioactive decay of U-238 is 4.5 billion years (4.5 x 109) and is
independent of initial concentrations. If a sample of U-238 initially contained 2.5 x 1018 atoms when
the universe was formed 15.8 billion years ago, how many U-238 atoms does it contain today?
(8 points)
page 3
9. (4 points) Label each box in the energy profile of
a reaction with the appropriate LETTER.
Energy
a. enthalpy of reaction (∆Hrexn)
b. products
c. reactants
d. activation energy (Ea)
Reaction progress
10. Studies of the decomposition of peroxyactyl nitrate, an air pollutant, resulted in the following data:
0 °C, k = 5.6 x 10-6 s-1; 10 °C, k = 3.2 x 10-5 s-1; 20 °C, k = 1.6 x 10-4 s-1; 30 °C, k = 7.6 x 10-4 s-1.
-7
a. (6 points) In the graph shown
below, define the axis labels
A and B.
axis A =
-8
-9
axis B =
-10
-11
-12
-13
0.0033 0.0033 0.0034 0.0035 0.0035 0.0036 0.0036 0.0037 0.0037
B
b. (4 points) Write the equation for the plot?
c.
(4 points)From
what feature of the graph can activation energy, Ea, be determined? Give a specific
formula for this feature, not a only a single word answer. [Note: This answer is not the same as
the one above.]
c.
(4 points)
What is the half-life of the decomposition at 30 °C. SHOW ALL WORK. (4 points)
page 4
11. (5 points) In the graph below the x axis is time in seconds and the y axis is concentration of MX in
moles/L for the reaction MX → M+ + X-. Write the rate law for this reaction.
12. (9 points) A solution contains a mixture of pentane and hexane at room temperature. the solution has
a vapor pressure of 358 mmHg. Pure pentane and hexane have vapor pressures of 425 and 151
mmHg, respectively. at room temperature. Assuming ideal behavior, what is the mole fraction of
each component in the solution
13. (9 points) SHOW ALL WORK as above! What is the molarity of a solution that is 26.0 % by mass
phosphoric acid (H3PO4, molar mass, 98.0) and that has a density of 1.155 g/mL?
14. (9 points) SHOW ALL WORK! The vapor pressure of water at 20 °C is 17.4 mmHg. What is the vapor
pressure of water over a solution prepared from 3.00 x 102 g of sucrose (C12H22O11, molar mass,
342) and 4.50 x 102 g of water?