CHEM 1B Determination of an Activation Energy page 2 Analysis / Questions (fill in the blanks / answer the questions below): 1. The solvolysis reaction is 1ot -order in R-Cl , which means that: A[RC]_ Ki(RCI]? At K.(RCI]? + In CRCI]o In[RCI]t = - h·t Rate = and %3D 2. The color change occurs when the OH is 0Sedup , and the solution therefore goes from being basic blue y acidic, yellow to being 90 N2.7mL of the R-Cl is left. 3. In terms of R-Cl, this means that 10 7 of the R-Cl has reacted, and So at the time of the color change: [R-CI] = _0,90 [R-CI]o %3D 4. Substitute the value of [R-CI]t from Q.3. into the appropriate equation from Q.1., and solve for k in terms of [R-CI]o and t. Show your work! In [R-C]t CR-CI]o In 909o [R-C)o [R-CIJO - -Kt -Kt Inlo.9)=-Kt -0.105 6.105 5. Use your average time (tave) for each temperature, and determine the value of k (with units) at each temperature. Show a sample calculation, and record all k values in the table below. 53.l6 St49s 51.35 K- Qe105 =2.05x101 =2,05x10 ミノリキ 51.35 room temperature warm water bath cool water bath 32°C Temperature 20°C 10°C Kva 2.05xin 51.35 3.62x10 -4 Time 295 5.20xie 2025 5. Write the Arrhenius equation (which relates rate EA RT k = Ae constant, temperature and the activation energy). 6. Rearrange the Arrhenius equation into a linear form relating k and T (as done on a screencast and in "class"). Show your steps / explain your reasoning. CHEM 1B Determination of an Activation Energy page 3 7. To determine Ea, a graph of (in units of ) vs. needs to be made. (x-axis) (y-axis) This will yield a line with slope = 8. Enter the values used in the table. indicate units T (°C) tave (s) k ( T (K) 1/T (K-1) In k room temperature warm water bath cool water bath Use a graphing calculator or graphing program to make the graph needed to determine E. Sketch the graph to the right > with labeled axes and scales with units. Plot the data points and draw the line of best fit. State the slope of the line. 9. Determine the experimental value of Ea with correct significant figures and units. Show your work. Conclusion
CHEM 1B Determination of an Activation Energy page 2 Analysis / Questions (fill in the blanks / answer the questions below): 1. The solvolysis reaction is 1ot -order in R-Cl , which means that: A[RC]_ Ki(RCI]? At K.(RCI]? + In CRCI]o In[RCI]t = - h·t Rate = and %3D 2. The color change occurs when the OH is 0Sedup , and the solution therefore goes from being basic blue y acidic, yellow to being 90 N2.7mL of the R-Cl is left. 3. In terms of R-Cl, this means that 10 7 of the R-Cl has reacted, and So at the time of the color change: [R-CI] = _0,90 [R-CI]o %3D 4. Substitute the value of [R-CI]t from Q.3. into the appropriate equation from Q.1., and solve for k in terms of [R-CI]o and t. Show your work! In [R-C]t CR-CI]o In 909o [R-C)o [R-CIJO - -Kt -Kt Inlo.9)=-Kt -0.105 6.105 5. Use your average time (tave) for each temperature, and determine the value of k (with units) at each temperature. Show a sample calculation, and record all k values in the table below. 53.l6 St49s 51.35 K- Qe105 =2.05x101 =2,05x10 ミノリキ 51.35 room temperature warm water bath cool water bath 32°C Temperature 20°C 10°C Kva 2.05xin 51.35 3.62x10 -4 Time 295 5.20xie 2025 5. Write the Arrhenius equation (which relates rate EA RT k = Ae constant, temperature and the activation energy). 6. Rearrange the Arrhenius equation into a linear form relating k and T (as done on a screencast and in "class"). Show your steps / explain your reasoning. CHEM 1B Determination of an Activation Energy page 3 7. To determine Ea, a graph of (in units of ) vs. needs to be made. (x-axis) (y-axis) This will yield a line with slope = 8. Enter the values used in the table. indicate units T (°C) tave (s) k ( T (K) 1/T (K-1) In k room temperature warm water bath cool water bath Use a graphing calculator or graphing program to make the graph needed to determine E. Sketch the graph to the right > with labeled axes and scales with units. Plot the data points and draw the line of best fit. State the slope of the line. 9. Determine the experimental value of Ea with correct significant figures and units. Show your work. Conclusion
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
Related questions
Question
Rate = -(Delta[RCl])/Delta t and
ln[RCl]t=-k*t+ln[RCl]0 < [R-Cl]-time equation
Test tube A = 0.30 of 0.10M NaOH(aq), 6.70ml DI H2O & 1 drop of bromophenol bue Test Tube B = 3.00M of 0.10M R-CL in acetone. Mix together in 3 water baths
Bath A Trial 1= 20C, 53.6s Trial 2= 20C, 49s for color to change
Bath B Trial 1= 32C, 18s Trail 2= 32C, 20s
Bath C Trial 1= 10C, 204s Trial B= 10C, 200s
Q.6 Rearrange the Arrhenius equation into a linear form relating k and T
Q.6a To determine Ea, a graph of (xaxis) ____ (in units of ___) vs. (yaxis) ____ needs to be made. This will yioeld a _____ line with a slope = ____
Q.6b enter values used in the table
Q.6c Determine the exp. values of Ea with correct sig figs and units
![CHEM 1B
Determination of an Activation Energy
page 2
Analysis / Questions (fill in the blanks / answer the questions below):
1. The solvolysis reaction is
1ot -order in R-Cl , which means that:
A[RC]_ Ki(RCI]?
At
K.(RCI]?
+ In CRCI]o
In[RCI]t
= - h·t
Rate =
and
%3D
2. The color change occurs when the OH is 0Sedup , and the solution therefore goes from being
basic
blue y
acidic,
yellow
to being
90
N2.7mL
of the R-Cl is left.
3. In terms of R-Cl, this means that 10 7
of the R-Cl has reacted, and
So at the time of the color change: [R-CI] = _0,90 [R-CI]o
%3D
4. Substitute the value of [R-CI]t from Q.3. into the appropriate equation from Q.1., and solve for k in terms
of [R-CI]o and t. Show your work!
In [R-C]t
CR-CI]o
In 909o [R-C)o
[R-CIJO
- -Kt
-Kt
Inlo.9)=-Kt
-0.105
6.105
5. Use your average time (tave) for each temperature, and determine the value of k (with units) at each
temperature. Show a sample calculation, and record all k values in the table below.
53.l6 St49s
51.35
K- Qe105
=2.05x101
=2,05x10
ミノリキ
51.35
room temperature
warm water bath
cool water bath
32°C
Temperature
20°C
10°C
Kva
2.05xin 51.35
3.62x10
-4
Time
295 5.20xie 2025
5. Write the Arrhenius equation (which relates rate
EA
RT
k = Ae
constant, temperature and the activation energy).
6. Rearrange the Arrhenius equation into a linear form relating k and T (as done on a screencast and in
"class"). Show your steps / explain your reasoning.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1fd693be-b98f-44c2-a8d1-a1b202988777%2F0ea0432b-d169-4b6c-8c84-a57d0afa6919%2Fw6p5ccl.jpeg&w=3840&q=75)
Transcribed Image Text:CHEM 1B
Determination of an Activation Energy
page 2
Analysis / Questions (fill in the blanks / answer the questions below):
1. The solvolysis reaction is
1ot -order in R-Cl , which means that:
A[RC]_ Ki(RCI]?
At
K.(RCI]?
+ In CRCI]o
In[RCI]t
= - h·t
Rate =
and
%3D
2. The color change occurs when the OH is 0Sedup , and the solution therefore goes from being
basic
blue y
acidic,
yellow
to being
90
N2.7mL
of the R-Cl is left.
3. In terms of R-Cl, this means that 10 7
of the R-Cl has reacted, and
So at the time of the color change: [R-CI] = _0,90 [R-CI]o
%3D
4. Substitute the value of [R-CI]t from Q.3. into the appropriate equation from Q.1., and solve for k in terms
of [R-CI]o and t. Show your work!
In [R-C]t
CR-CI]o
In 909o [R-C)o
[R-CIJO
- -Kt
-Kt
Inlo.9)=-Kt
-0.105
6.105
5. Use your average time (tave) for each temperature, and determine the value of k (with units) at each
temperature. Show a sample calculation, and record all k values in the table below.
53.l6 St49s
51.35
K- Qe105
=2.05x101
=2,05x10
ミノリキ
51.35
room temperature
warm water bath
cool water bath
32°C
Temperature
20°C
10°C
Kva
2.05xin 51.35
3.62x10
-4
Time
295 5.20xie 2025
5. Write the Arrhenius equation (which relates rate
EA
RT
k = Ae
constant, temperature and the activation energy).
6. Rearrange the Arrhenius equation into a linear form relating k and T (as done on a screencast and in
"class"). Show your steps / explain your reasoning.
Transcribed Image Text:CHEM 1B
Determination of an Activation Energy
page 3
7. To determine Ea, a graph of
(in units of
) vs.
needs to be made.
(x-axis)
(y-axis)
This will yield a
line with slope =
8. Enter the values used in the table.
indicate units
T (°C)
tave (s)
k (
T (K)
1/T (K-1)
In k
room
temperature
warm
water bath
cool
water bath
Use a graphing calculator or
graphing program to make the
graph needed to determine E.
Sketch the graph to the right >
with labeled axes and scales
with units.
Plot the data points and
draw the line of best fit.
State the slope of the line.
9. Determine the experimental value of Ea with correct significant figures and units. Show your work.
Conclusion
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