E1_density_in_lab_worksheet_SP2023
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University of Texas *
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2023
Subject
Chemistry
Date
Dec 6, 2023
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GRADING RUBRIC
EXPERIMENT 1 – LAB REPORT Worksheet
(80 pts)
Student name: _ ___________________________________
TA name: __ _______________________________________
Day & time of the lab: ____Wednesday 1pm-5pm_______________________
The lab report packet for this experiment should consist of the following in THIS
ORDER:
The lab report packet for this experiment should consist of the following:
1.
(10 pts)
IN-lab notebook pages
1.1. Experimental procedure
1.2. Observations that were noted
2.
(70 pts)
The WORKSHEET
2.1.
(60 pts)
Complete (full sentence) answers to ALL the discussion questions (DQ) and
Data Analysis Section.
2.2.
(10 pts
) POST-lab notebook pages
2.2.1.
All calculations performed present
Complete this worksheet and turn in your digital lab packet to Canvas.
Feel free to
adjust space in this document as needed. The tables provided here are only an example of
these may look like, feel free to replace the entire tables with your own creations using Excel,
etc All tables and figures (graphs) must be accompanied by
captions
which should be
positioned
above tables and below figures.
TURN IN the digital copy to Canvas by the
end of your section. All electronic material must be completed by the due date to avoid
late penalties.
1
P. Sotelo SP2023
IN-LAB NOTEBOOK PAGES
(10 pts)
Name, date, title of experiment, detailed procedure and observations taken while in lab.
2
P. Sotelo SP2023
DISCUSSION QUESTIONS & POST-lab analysis of data -
(70 pts)
All discussion questions must be answered in complete sentences.
Complete the tables 1,2 & 4,5 below. You may use Excel to perform all the calculations
but do show the following “
sample calculations
” in your
notebook
in the
POST-lab
section (immediately following the IN-lab notes). You must ALWAYS show all the work
and the calculation leading to the result in detail for full credit.
(9 pts)
DQ1.
You used a beaker, a graduated cylinder and a volumetric pipette to transfer 5
mL of a liquid sample into a small beaker. What exact volume did you measure?
(Hint: How
many significant figures or decimal places do your measurements have for each type of
glassware? Was it 5.0 mL or 5.00 mL or else?)
Is this information available on the glassware
itself? If yes, where and what did you notice?
And finally, which one of the glassware used in
this experiment give you a more accurate measurement?
-The exact volume I measured for the beaker was 5 mL, the graduated cylinder was 5.0
mL, and the volumetric pipette was 5.00 mL. This information was available on the
glassware itself and was included at the top of the glassware where it shows the number
of decimal places it could determine. For example, the volumetric pipette was listed as +
0.01, meaning it could measure to the hundredth place and the graduated cylinder was
listed as +
0.1, meaning it could measure to the tenth place. The volumetric pipette gave
me the most accurate measurement in this experiment, as its density was closest to 1
g/mL.
3
P. Sotelo SP2023
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(6 pts)
Table 1:
A sample table summarizing all measurements leading to the density of water.
(7 pts)
DQ2.
Based
on your
entries
in Table
1, what
is the
average
density
of
deionized water resulting from your measurements with: (a) a beaker (b) a graduated cylinder
and (c) a volumetric pipette?
-The average density of deionized water using a beaker is 0.8 g/mL, the average density using a
graduated cylinder is 0.95 g/mL, and the average density using a volumetric pipette is 0.982
g/mL.
Beaker – 0.8 + 0.8 + 0.8 = 2.4 / 3 = 0.8 g/mL
Graduated Cylinder – 0.95 + 0.94 + 0.96 = 2.85 / 3 = 0.95 g/mL
Volumetric Pipette – 0.993 + 0.961 + 0.993 = 2.947 / 3 = 0.982 g/mL
(6 pts)
Table 2:
A sample table summarizing measurements leading to the density of a solution.
Saline Solution
4
P. Sotelo SP2023
Water
30 mL beaker
Empty
beaker
(g)
Beaker +
water (g)
Mass of
water (g)
Density
(g/mL)
Trial 1
21.446 g
25.397 g
3.951 g
0.8 g/mL
Trial 2
21.445 g
25.431 g
3.986 g
0.8 g/mL
Trial 3
21.448 g
25.383 g
3.935 g
0.8 g/mL
Graduated
Cylinder
Empty
beaker
(g)
Beaker +
water (g)
Mass of
water (g)
Density
(g/mL)
Trial 1
21.453 g
26.196 g
4.743 g
0.95 g/mL
Trial 2
21.499 g
26.223 g
4.724 g
0.94 g/mL
Trial 3
21.468 g
26.244 g
4.776 g
0.96 g/mL
Volumetric Pipette
Empty
beaker
(g)
Beaker +
water (g)
Mass of
water (g)
Density
(g/mL)
Trial 1
21.450 g
26.413 g
4.963 g
0.993 g/mL
Trail 2
21.445 g
26.251 g
4.806 g
0.961 g/mL
Trial 3
21.452 g
26.413 g
4.961 g
0.993 g/mL
30 mL beaker
Empty
beaker
(g)
Beaker +
water (g)
Mass of
water (g)
Density
(g/mL)
Trial 1
21.488 g
25.408 g
3.92 g
0.8 g/mL
Trial 2
21.460 g
25.486 g
4.026 g
0.8 g/mL
Trial 3
21.501 g
25.710 g
4.209 g
0.8 g/mL
Graduated
Cylinder
Empty
beaker
(g)
Beaker +
water (g)
Mass of
water (g)
Density
(g/mL)
Trial 1
21.443 g
26.917 g
5.474 g
1.1 g/mL
Trial 2
21.459 g
26.884 g
5.425 g
1.1 g/mL
Trial 3
21.448 g
26.878 g
5.430 g
1.1 g/mL
Volumetric Pipette
Empty
beaker
(g)
Beaker +
water (g)
Mass of
water (g)
Density
(g/mL)
Trial 1
21.501 g
26.904 g
5.403 g
1.08 g/mL
Trail 2
21.479 g
26.984 g
5.505 g
1.10 g/mL
Trial 3
21.515 g
27.052 g
5.537 g
1.12 g/mL
(7 pts)
DQ3.
Based on your entries in Table 2, what is the average density of your saline
solution resulting from your measurements with: (a) a beaker (b) a graduated cylinder and (c)
a volumetric pipette?
- The average density of deionized water using a beaker is 0.8 g/mL, the average density using a
graduated cylinder is 1.1 g/mL, and the average density using a volumetric pipette is 1.10 g/mL.
Beaker – 0.8 + 0.8 + 0.8 = 2.4 / 3 = 0.8 g/mL
Graduated Cylinder – 1.1 + 1.1 + 1.1 = 3.3 / 3 = 1.1 g/mL
Volumetric Pipette – 1.08 + 1.10 + 1.12 = 3.30 / 3 = 1.10 g/mL
(6 pts)
Table 4:
A sample table summarizing all measurements leading to the densities of
unknown metals.
Unknown Metal 1
5
P. Sotelo SP2023
mass of metal (g)
initial volume (mL)
final volume (mL)
density (g/mL)
trial 1
26.797 g
4.1 mL
7.1 mL
8.9 g/mL
trial 2
26.796 g
4.1 mL
7.1 mL
8.9 g/mL
trial 3
26.798 g
4.0 mL
7.0 mL
8.9 g/mL
Unknown Metal 2
mass of metal (g)
initial volume (mL)
final volume (mL)
density (g/mL)
trial 1
8.048 g
4.0 mL
7.0 mL
2.7 g/mL
trial 2
8.045 g
4.0 mL
7.0 mL
2.7 g/mL
trial 3
8.048 g
4.1 mL
7.1 mL
2.7 g/mL
(7 pts)
DQ4.
Calculate the average density and standard deviation for each metal cylinder.
Report the results as:
´
x
s
g/mL
-The average density and standard deviation of metal cylinder 1 is 8.9 +
0 g/mL and metal
cylinder 2 is 2.7 +
0 g/mL.
Average Density Metal Cylinder 1 – 8.9 + 8.9 + 8.9 = 26.7 / 3 = 8.9 g/mL
Standard Deviation–(8.9-8.9)^2 + (8.9-8.9)^2 + (8.9-8.9)^2 = 0, further calculation leads to 0
Average Density Metal Cylinder 2 – 2.7 + 2.7 + 2.7 = 8.1 / 3 = 2.7 g/mL
Standard Deviation–(2.7-2.7)^2 + (2.7-2.7)^2 + (2.7-2.7)^2 = 0, further calculation leads to 0
(5 pts)
DQ5.
Identify each metal cylinder using the example metal density table in the lab
manual.
-Metal cylinder 1 is Copper, with a density of 8.96 g/mL and metal cylinder 2 is Aluminum with
a density of 2.7 g/mL.
(7 pts)
DQ6.
Discuss in detail various observed or reasonably predictable/suspected experimental
errors.
(The term “human error” should not be listed.)
What would you do differently to prevent
errors, improve outcome, etc. if this experiment was to be repeated?
6
P. Sotelo SP2023
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-
Experimental errors that I observed include the water/saline residue that was left over in the
glassware after it has been transferred to the beaker, leading to a loss of mass. Another
predictable error includes the undermeasurement while using glassware. Both of these errors
could lead to a lack of precision if large enough. I believe I could prevent these errors with more
practice in the lab environment, such as practicing taking measurements and transferring liquids
in glassware.
(10 pts)
POST-LAB NOTEBOOK PAGES
Sample Calculations 1-13 can be found on notebook page #4, image is listed below.
Sample Calculations 14-18 can be found on notebook page #5, image is listed below.
(0.5 pts)
Sample calculation 1:
Calculate the mass of water obtained using a beaker
for trial 1 (weight difference).
(0.5 pts)
Sample calculation 2:
Calculate the density of water for a beaker in trial 1.
(0.5 pts)
Sample calculation 3:
Calculate the mass of water obtained using a graduated
cylinder for trial 1 (weight difference).
(0.5 pts)
Sample calculation 4:
Calculate the density of water for grad. cylinder in trial
1.
(0.5 pts)
Sample calculation 5:
Calculate the mass of water obtained using a
volumetric pipette for trial 1 (weight difference).
(0.5 pts)
Sample calculation 6:
Calculate the density of water for the volumetric
pipette in trial 1.
(0.5 pts)
Sample calculation 7:
Calculate the average density of water for
measurements with all three types of glassware.
(0.5 pts)
Sample calculation 8:
Calculate the mass of saline obtained using a beaker
for trial 1 (weight difference).
(0.5 pts)
Sample calculation 9:
Calculate the density of saline for a beaker in trial 1.
(0.5 pts)
Sample calculation 10:
Calculate the mass of saline obtained using a
graduated cylinder for trial 1 (weight difference).
(0.5 pts)
Sample calculation 11:
Calculate the density of saline for grad. cylinder in trial
1.
7
P. Sotelo SP2023
(0.5 pts)
Sample calculation 12:
Calculate the mass of saline obtained using a
volumetric pipette for trial 1 (weight difference).
(0.5 pts)
Sample calculation 13:
Calculate the density of saline for the volumetric
pipette in trial 1.
(1 pt)
Sample calculation 14:
Calculate the average density of saline for
measurements with all three types of glassware.
(0.5 pts)
Sample calculation 15:
Calculate volume of water displaced by a metal
cylinder.
(0.5 pts)
Sample calculation 16:
Calculate density of a metal cylinder
(0.5 pts)
Sample calculation 17:
Calculate average density of a metal cylinder
(1 pt)
Sample calculation 18:
Calculate the standard deviation of the density values
for a metal cylinder.
8
P. Sotelo SP2023
9
P. Sotelo SP2023
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