Test tube A is bue Dasi2, due to Bromopnanol biue cool water bath room temperature warm water bath 1o'C 32°C 185 26°C Temperature 495 205 3ri40s 3:345 Time Trial 1 Trial 2 Trial 1 Trial 2 Trial 1 Trial 2 So at the time of the color change: [R-CI], = 0.90 [R-CIJ. 4. Substitute the value of [R-CI), from Q.3. into the appropriate equation from Q.1., and solve for k in terms of (R-CI), and t. Show your work! 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. room temperature warm water bath cool water bath Temperature Time 5. Write the Arrhenius equation (which relates rate constant, temperature and the activation energy). k = 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 E, a graph of (in units of ) vs. (y-axis) needs to be made. (x-axis) This will yield a line with slope = 8. Enter the values used in the table. indicate units тсс) k ( 1/7 (K-1) fave (s) T (K) In k room temperature warm water bath col 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 E, 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...

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ALL INFORMATION NEEDED IS PROVIDED, I NEED FIRST QUESTIONS ANSWERED FIRST BEFORE OTHERS CAN BE ANSWERED

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

average out both trials for each bath

color change happens after 10% of R-Cl has reacted so

In terms of R-Cl this means that 10% of the R-Cl has reacted and ____ of the R-Cl is left

Q1. at the time of the color change [R-Cl]t=____[R-Cl]o (Fill in the blank)

Q4. Substitute the value of [R-Cl]t into appropriate equation listed above and solve for k in terms of [R-Cl] and t.

Q5. Use average time for each temp and determine the value of k (with units) at each temperature

Q6. Rearrange the Arrhenius equation into a linear form relating k and T

Q7-9

Test tube A is bue Dasi2,
due to Bromopnanol biue
cool water bath
room temperature
warm water bath
1o'C
32°C
185
26°C
Temperature
495
205
3ri40s
3:345
Time
Trial 1
Trial 2
Trial 1
Trial 2
Trial 1
Trial 2
So at the time of the color change: [R-CI], = 0.90 [R-CIJ.
4. Substitute the value of [R-CI), from Q.3. into the appropriate equation from Q.1., and solve for k in terms
of (R-CI), and t. Show your work!
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.
room temperature
warm water bath
cool water bath
Temperature
Time
5. Write the Arrhenius equation (which relates rate
constant, temperature and the activation energy).
k =
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 E, a graph of
(in units of
) vs.
(y-axis)
needs to be made.
(x-axis)
This will yield a
line with slope =
8. Enter the values used in the table.
indicate units
тсс)
k (
1/7 (K-1)
fave (s)
T (K)
In k
room
temperature
warm
water bath
col
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 E, with correct significant figures and units. Show your work.
Conclusion

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