S : L 1REPORT HEET AB CHEM 108
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Ashley Martin
name
III.Chlorine isotopes: “Mix Isotopes”
Composition of Cl found in nature:
# 35Cl atoms# 37Cl atoms
3
II.Oxygen isotopes: “Make Isotopes”
Heaviest stable isotope:
Mass numberIsotope name
Fill in all the information in boxes highlighted in yellow!
I.Carbon isotopes: “Make Isotopes”
First unstable “heavy” isotope:
Mass numberIsotope name
14 Carbon-14
First unstable “light” isotope:
Mass numberIsotope name
11 Carbon-11
Most abundant isotope:
Mass numberIsotope name
% abundance Cl
# of protons
6
# of protons
6
# of protons
8
section
% abundance
% abundance
# of neutrons
# of neutrons
# of neutrons
Cl
date
12
18
10
Carbon-12
Oxygen-18
75.76
SIMULATION: Isotopes and Atomic Mass
98.93
8
5
10
24.24
35 37
CHEM 108
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EXPERIMENT: Laboratory Techniques and Measurements
Use rules of significant figures; include units with each result.
Data Table 3: Mass measurements
Data Table 1: Length measurements
Data Table 2: Temperature measurements
Object
CD or DVD
Key
Spoon
Fork
Water
Hot from tap
Boiling
Boiling for 5 minutes
Cold from tap
Ice water – 1 minute
Ice water – 5
minutes
Object
Pen or pencil
3 Pennies
1 Quarter
2 Quarters, 3 Dimes
4 Dimes, 5 Pennies
3 Quarters, 1 Dime, 5 Pennies
Key
Key, 1 Quarter, 4 Pennies
Temperature (°C)
Length (cm)
Estimated Mass (g)
Temperature (°F)
Length (mm)
Actual Mass (g)
Length (m)
Temperature (K)
Actual mass (kg)
43.3
100
92
7
1
3
12
5.2
17.
2
20.
3
8.70
7.47
5.55
18.0
21.5
7
31.7
9
9.17
24.8
9
110
212
197
-13-9
-17.2
-16.1
12
0
52
17
2
20
3
8.78
7.54
5.64
18.0
6
21.6
1
31.8
2
9.39
25.0
9
316.5
373.2
364.8
248.2
245.8
246.4
0.12
0.0052
0.172
0.203
0.0087
8
0.0075
4
0.0056
4
0.0180
6
0.0216
1
0.0318
2
0.0093
9
0 0250
CHEM 108
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Data Table 7: Archimedes’ Method
Data Table 6: Displacement Method
Data Table 4: Liquid measurements
Data Table 5: Magnet – Measurement Method
Object:
Magne
t
Object
Magnet
Metal bolt
Object
Metal Bolt
Magnet
Liquid
Water
Isopropyl alcohol
Mass
(g)
Mass
(g)
Volume
(mL)
Mass
(g)
Lengt
h (cm)
Mass A
Graduated
Cylinder (g)
Initial volume of
graduated cylinder
(mL)
Widt
h
(cm)
Mass of
Displaced
Water (g)
Mass B
Graduated
Cylinder
with liquid (g)
Heigh
t (cm)
Final volume of
graduated cylinder
(mL)
Volume of
Displaced
Water
(mL)
Mass B -
A Liquid
(g)
Volume
(cm3)
Object
Volume
(mL)
Densit
y g/mL
Densit
y
(g/mL)
Densit
y
(g/cm3
)
Densit
y
(g/mL)
%
Error
4.24
7.71
4.24
5
5
7.7
4.2
4
2.5
7.0
7.0
17.7
1
17.7
1
1.1
0.9
0.5
22.81
22.26
9
9.2
0.5
0.9
3
1.1
2
5.1
4.6
0.625
2
2.2
1.02
0.91
7.2
4.7
2.1
2
3.5
2
1
5
7g/ml
CHEM 108
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Post-Laboratory Questions
C.
Show work whenever feasible! Use rules of significant figures; include units with each result.
A.Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what
could be the reason?
It could be that the sea level is higher than the normal level needed for water to boil at 100
degrees celius
B.While heating two different samples of water at sea level, one boils at 102°C and one boils at
99.2°C. Calculate the percent error for each sample from the theoretical 100.0°C.
0.02% & 0.01%
An unknown, rectangular substance measures 3.6 cm high, 4.21 cm long, and 1.17 cm wide. If the
mass is 21.3 g, what is this substance’s density (in grams per milliliter)?
1.20g/cm³
CHEM 108
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F.How did the magnet’s density measurement using the Archimedes’ Principle compare to the
density measurement using the calculated volume? Which method might be more accurate?
Why?
The measurements were way off. I would trust a more calculated volume versus the
Archimedes’ principle that requires steps that could result in more errors.
D.A sample of gold (Au) has a mass of 26.15 g. Given that the theoretical density is 19.30 g/mL,
what is the volume of the gold sample?
1.35mL
E.What would happen if you dropped the object into the beaker while using the Archimedes’
Principle method instead of submerging the object?
It could result in the loss of water from the beaker or changes in the weight of the object
related to the principle. The force from dropping the object would not give a accurate result as
we are relating the results to the buoyancy of the object.
CHEM 108
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G.You are given a small piece of gold colored material and want to determine if it is actually gold.
Using the Archimedes’ Principle, you find that the volume is 0.40 cm3 and the mass is 6.0 g.
What conclusions can you reach from your simple density analysis?
The density of this material is 15g/ml. The actual density of gold is 19.30g/ml so the material
cannot be solid gold and may contain other materials.
