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Lab report General Chemistry laboratory, Chem18 – Experiments 1 Name
Leo Rahmey Bench B20
Lab day and
section
Wednesday 2B TA
Nicole, Jolie Experiment #
1
Dates of Experiment:
8/31/2022
Date of Submission:
8/31/2022
Title:
Density of Water
DATA TABLE – Experiment 1 Paste on this page your completed Data Table from Excel for Exp. 1
Lab report General Chemistry laboratory, Chem18 – Experiments 1 Density of water
I
II
III
Uncertainty
(equipment error)
Weight: empty flask+stopper (g)
40.2248
39.9449
41.2414
+/- 0.0001
Weight: water+ flask+stopper (g)
50.1866
49.9159
51.2006
+/- 0.0001
Weight: water (g)
9.9618
9.9710
9.9592
+/- 0.0001
4
Volume (mL)
10.00
10.00
10.00
+/- 0.01
Density(g/mL)
0.9962
0.9971
0.9959
Deviation, |d
trial
-d
aver
|
(g/mL)
0.00022
0.0007
0.00048
Aver. Density, d
aver
(g/mL)
*
0.9964
St.dev. (g/mL)
0.00062
RSD (%)
0.062
2
Density from HCP (g/mL) (true
value)
0.9975883
Temperature
(
o
C)
22.8
REA (%)
0.119
1
*
report the average density with correct number of sig. figures here, use extra sig. figures in calculations
My measurement is more (accurate or precise):
Accurate
The largest errors in my measurement are (systematic or
random):
Random
SAMPLE CALCULATIONS: Sample calculations must be typed and include general formula with units, numbers used in calculations, and final results with correct units.
Density of water - measurement #1:
D = M/V 9.9618g/10.00mL = .9962 g/mL
Average density of water: (D1 + D2 + D3… + Dn)/n = Average Density
(.9962 + .9971 + .9959)/3 = .9964
Lab report General Chemistry laboratory, Chem18 – Experiments 1 Standard deviation for the density of water:
RSD (density of water): REA (density of water): .
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Student Information
Chem159 - Practice 5 Compounds
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Liam A Fox (laf251)
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297:49:47
6 7
8
9.
10
11 12 13
14
15
16
17 18
19
20
(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
compound?.
9.28 g
21.5 g
23.8 g
22.1 g (Correct answer)
23.2 g
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Question 3
A piece of Na placed into a graduated cylinder of water displaces 22 mL of water. Based on the
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An object with a mass of 47.2 kilograms and a volume of 47.6 liters. Find the density with units of g/cm³. Report your answer
with three significant figures.
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Fell 2021
Vorksheet 3: Dimensional Analysis
Common brass is a copper (Cu) and zinc (Zn) alloy containing
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A. Write the percent Cu by mass as a conversion factor in the
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(1 lb = 453.6 g, 1000 g = 1 kg, 2.20 lb = 1 kg)
100
Mass of Zn in pounds:
or the below questions consider the following problem: If the radius of a potassium (K) atom is 2.48 x 10-7
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The enolate of a ketone can be treated with an ester to give a diketone. Drawa mechanism for this Claisen-like reaction and explain
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For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen
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A 130.3 g piece of copper (specific heat 0.38 Jİ •°C) is heated and
then placed into 400.0 g of water initially at 20.7°C. The water
increases in temperature to 22.2°C. What is the initial temperature of
°C
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HMAC-9108ebc91785914406e994a5937753d2#10001
Constants I
Part A
3.00 L of 0.500 M NAOH
Express your answer with the appropriate units.
HA
Value
Units
m%3D
Submit
Request Answer
2.
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26) The floor tiles in SE 27 are about 1 square foot and the lab is about 25 tiles wide and about
36 tiles from front to back. When the emergency shower was demonstrated, in 10. seconds
the water in the trash can was about 1 foot deep. One student estimated this was 2.5 gallons.
Estimate how deep the room will get in inches after a 15 minute shower. List 3 simplifving
assumptions you make in this calculation
rea
L-36 Tile
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玩,
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Record
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observations following each reaction including changes in color and state of matter.
AGNO3 (Ag*)
Pb(NO3)2 (Pb²*)
Ca(NO3)2 (Ca²+)
а
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i
NazCO3
Light orange solid
white, cloudy solid
white, cloudy, solid
(СО2)
b
NaOH
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dark brown solid
stay clear, liquid
white, cloudy solid
(OH)
g
k
NazSO4
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white, cloudy, solid
white, cloudy, solid
(SO?)
d
NaCl
1
white, cloudy solid
white, cloudy solid
stay clear, liquid
(CF)
....
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LIMIT TEST (IMPURITIES - BIOLOGICAL)
Instructions: Note the color change of each of the samples by writing blue or pink accordingly. Then give inference whether the sample is contaminated or not contaminated upon observation.
Answer the highlighted numbers.
BLANK
(Sterile distilled water)
Reference Sugar Solution
Sample A
Sample B
REPLICATE 1
BLUE
BLUE
PINK
PINK
REPLICATE 2
BLUE
PINK
BLUE
PINK
REPLICATE 3
BLUE
PINK
PINK
PINK
INFERENCE
NOT CONTAMINATED
CONTAMINATED
1
2
1.
2.
3. Which of the two samples is relatively clean of biological impurities?
4. Given the result in limit test as an analyst, what will be the final conclusion to this? Write whether rejected or accepted for each sample.
(see attached photo)
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