PreLab D_ Chem 3AL_ Organic Chemistry Laboratory (Spring 2023)
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PreLab D: Chem 3AL: Organic Chemistry Laboratory (Spring 2023)
https://bcourses.berkeley.edu/courses/1521126/quizzes/2415110
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PreLab D Due
Feb 13 at 1pm
Points
4
Questions
7
Available
Feb 6 at 1pm - May 12 at 11:59pm
Time Limit
None
Instructions
Attempt History
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Time
Score
LATEST
Attempt 1
213 minutes
3 out of 4 *
Score for this quiz: 3
out of 4 *
Submitted Feb 12 at 9:55pm
This attempt took 213 minutes.
Please read through Experiment 5 in the lab textbook, plus the procedural modifications on the Lab D
Notebook Guide, before completing this assignment.
Although the assignment is labeled a "quiz" by bCourses, there is no "timer" on your submission. You are
welcome to consult with course materials, course staff, other students, and outside resources to help you
understand the concepts addressed in the assignment, but copying-and-pasting-without-understanding
(whether from other students or other sources) is strictly prohibited.
Note: Only one attempt is permitted, so you should make sure not to actually click submit until you're
satisfied with your final answers. Opening the assignment to see what the questions are, closing it, and
then re-opening it later to continue working on it is fine!
0 / 0 pts
Question 1
Are you submitting this assignment on time (prior to the start of your
assigned lab section during the week of Feb 13-17)?
If so, please write "YES" below. If not, please provide a short explanation.
2/12/23, 9:55 PM
PreLab D: Chem 3AL: Organic Chemistry Laboratory (Spring 2023)
https://bcourses.berkeley.edu/courses/1521126/quizzes/2415110
2/8
YES
Correct!
Correct!
orrect Answers
orrect Answers
yes NA Yes. yes. n/a na YES. N/A Yes YES 0.6 / 0.6 pts
Question 2
In Lab D Part 0, you will work with your teammates to choose an
appropriate recrystallization solvent for adipic acid. Some possible
recrystallization solvents are shown below. Look up the boiling points of
each and fill in your answers below.
SOLVENT
NAME
STRUCTURE
BOILING POINT
acetone
[ Select ]
ethanol
78 ºC
diethyl
ether
[ Select ]
hexane
[ Select ]
water
100 ºC
Give one reason why diethyl ether isn't typically used as a recrystallization
solvent:
low boiling point means you'll lose all your solvent
2/12/23, 9:55 PM
PreLab D: Chem 3AL: Organic Chemistry Laboratory (Spring 2023)
https://bcourses.berkeley.edu/courses/1521126/quizzes/2415110
3/8
Answer 1:
Answer 2:
Answer 3:
Answer 4:
Answer 5:
Answer 6:
56 ºC Correct!
Correct!
78 ºC Correct!
Correct!
35 ºC Correct!
Correct!
69 ºC Correct!
Correct!
100 ºC Correct!
Correct!
low boiling point means you'll lose all your solvent Correct!
Correct!
0.6 / 0.6 pts
Question 3
In Lab D Part I, you will start with 3 mL of room temperature (25 C) water.
Based on the solubility data provided below, what are the maximum
amounts of adipic and salicylic acid you can expect to dissolve in this
much water at 25 C?
Temp
(°C)
Solubility (
mg per 0.1 mL H
O)
Adipic Acid
Salicylic Acid
100
>95
8.3
25
2.5
0.2
0
0.3
0.1
o
o
2
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terface/acellus_engine.htm?ClassID=1467683063
Use the data below to determine the
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Compound
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Et
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Question 19 of 20 (5 points) Question Attempt: 1 of 1
Time Remaining: 30:47
Hannah
10
= 11
= 12
=13
=14
=15
= 16
17
18
19
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Predict the reactants of this chemical reaction. That is, fill in the left side of the chemical equation. Be sure the equation you submit is balanced. (You can edit
both sides of the equation to balance it, if you need to.)
do
Note: you are writing the molecular, and not the net ionic equation.
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Data Collection
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Concentration of NaOH stock solution:
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Concentration of t-BuCl stock solution:
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Volume of t-BuCl solution:
10 mL stock stock solution added to 25 mL acetone
Table view
List view
Kinetic Data
Volume of
Moles of Amount of
t-Bucl
(mol)
[-Buc]
In[-BuC
Time, t (s) added base added base
(mL)
(mol)
First
addition
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0.50
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1.00
Third
addition
160
1.52
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addition
224
1.99
Flfth
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334
3.01
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3.48
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Show Transcribed Text
Initial mass (g) of Mg used (approximate)
Mass (g) of filter paper (before use)
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Mass (g) of recovered Cu metal
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A
Edit Answer
3,35
Edit
2.25
Edit
Try 1: X 1.0972
Try 2:11
55
Info 1040
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0.32
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List the following compounds from highest boiling to lowest boiling:
Rank the compounds from highest boiling to lowest boiling. To rank items as equivalent, overlap them.
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Chem159 - Practice 5 Compounds
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(Not Answered)
45.3 g of magnesium sulfate heptahydrate is heated in an oven until all the water is driven off. What is the mass of the anhydrous
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2. An 84 kg University of Toledo groundskeeper who is spraying a 100 mg/L solution of the
insecticide dieldrin (MW = 381; logP = 4.56) on some trees exposes 100 cm“ of his skin to the
solution over a 4 hr period. Dieldrin has a half-life of about 6 months, a volume of distribution of
about 40 L/kg, and a dermal permeability of about 3 x 10° cm/sec.
(a) Estimate the absorption rate during the exposure period assuming the blood concentration is
much lower than the skin concentration (i.e., take the blood level to be zero in the skin
absorption equation).
(b) Estimate how it takes after exposure begins for the groundskeeper's plasma dieldrin levels to
reach 1 ng/L.
(c) Estimate the maximum plasma dieldrin concentration in ng/L that will occur in this
groundskeeper due to this exposure.
(d) Estimate how long it will take after exposure ends for the groundskeeper's plasma dieldrin
levels to drop back down to 1 ng/L.
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Madeline Carlo - CHM 112 HW X
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.1. Refer to the table of standard reduction potentials.
Standard Reduction Potentials at 25 C
Reduction Half-Reaction
(V)
FAg + 2 €
H2O{aq) + 2 H*(aq)+ 2 6
Mno,taq) + 8 H*(aq) + 5 &
Clalg) + 2 e
CrOFMaq)+ 14 H*(aq) + 6 6-
Ozlg + 4 H*(aq) + 4 &
Bra() + 26
Ag*(aq) + e
Fe*(aq) + e
Ozl9) + 2 H'(aq) + 2 €
2(s)+ 26
Ozlg) + 2 HO) + 46
Cu (aq) + 2 €
Sn" (ag)+ 2 6
2 P(aq)
2 H2O()
→ Mn(aq) + 4 H;0()
→2 cr(aq)
2 Cr (aq)+ 7 H0()
→2 HO()
2 Br(aq)
Ag(s)
» Fe*(aq)
→H;Oz(aq)
→2 F(aq)
→4 OH"(aq)
2.87
1.78
1.51
1.36
1.33
3.
1.23
1.09
0.80
0.77…
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- View History Bookmarks People Tab Window Help S, Amaya K - Outlo x B Chapter 5- CHEM-1110-941- x Question 20 - Chapter 5- Con x education.com/ext/map/index.html?_con%3con&external_browser%3D0&launchUrl=https%253A%252F%252Flms Saved 3 attempts left Check my work Enter your answer in the provided box. It takes 155 s for an unknown gas to effuse through a porous wall and 97 s for the same volume of N2 gas to effuse at the same temperature and pressure. What is the molar mass of the unknown gas? g/mol ... 115 MAR 1664 18 ottv Aarrow_forwardwhat is the concentration of the unknown sample using serial diluitions: 0.05M 1.7472nm, 0.025M 0.8569nm, 0.0125M 0.4167nm, 0.00625M 0.1958nm the epsilon value is 0.0101 and l is 1 cmarrow_forwardData Collection Kinetic Data Collection Time, t (s) Volume of added base (mL) First addition 40 0.50 Second addition 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Fifth addition 278 2.49 Sixth addition 334 3.01 Seventh additlon 389 3.48 Calculations Concentration of NaOH stock solution: 0.01 M Concentration of t-BuCl stock solution: 0.2 M Volume of t-BuCl solution: 10 mL stock stock solution added to 25 mL acetone Table view List view Kinetic Data Volume of Moles of Amount of t-Bucl (mol) [-Buc] In[-BuC Time, t (s) added base added base (mL) (mol) First addition 40 0.50 Second additlon 101 1.00 Third addition 160 1.52 Fourth addition 224 1.99 Flfth additlon 278 2.49 Sixth additlon 334 3.01 Seventh addition 389 3.48 Use the data in the table above to plot In[t-BuC]]; vs time (s). Include labelled axis, a title, and a linear trendline. Upload your plot here.arrow_forward
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- ter 9- CHEM A054 520 2 x Question 12 - Chapter 9 part 2 X с Chapter 9 part 2 Homework i 12 1 points ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=0&launchUrl=https%253A%252F%25 8 01:46:13 eBook Hint Print References Mc Graw Hill CH6_Chem103 - Kenai Peninsu X + °C Determine the freezing point of an aqueous solution that is 0.584 m sucrose. Saved DUarrow_forwardFINAL Experiment 1- January 2021_-789644623 - Saved Layout Review View Table A friend of yours went panning for gold last weekend and found a nugget that appears to be gold. With your newfound scientific prowess, you set out to determine if it is really gold. Your tests show that the nugget has a mass of 7.6 g. Immersing the nugget in water raised the volume from 7.22 mL to 8.06 mL. The density of gold is 19.32 g/cm3. What will you tell your friend? acerarrow_forwardphs.blackboard.com/webapps/assessment/take/take.jsp?course_assessment_id%3D 36688_1&course_id%3D_31958 1&content_id%3_1130567_1&- 8r 10 13 140 15 16 20 11 12 17 18 19 20 A Moving to another question will save this response. Quèstion 6 Select the statement that is not supported by the following equation: q=0=(mwater)(Cwater)(ATwater)+ (mmetal)(Cmetal)( ATmetal) The total change in heat is the sum of the changes in heat of water and a metal. Energy is conserved. Energy is transferred between water and a metal. Energy is lost during a calorimetry experiment. A Moving to another question will save this response. hp & %23 9. 6. 00 进3arrow_forward
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