S : L 1REPORT HEET AB CHEM 108
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Deleker Clemmer
name
III.Chlorine isotopes: “Mix Isotopes”
Composition of Cl found in nature:
# 35Cl atoms# 37Cl atoms
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
16Carbon – 16
First unstable “light” isotope:
Mass numberIsotope name
14Carbon – 14
Most abundant isotope:
Mass numberIsotope name
% abundance Cl
# of protons
6
# of protons
8
# of protons
8
B01
section
% abundance
% abundance
# of neutrons
# of neutrons
# of neutrons
Cl
1/23/17
date
12
18
75 24
Carbon – 12
Oxygen – 18
75.76
SIMULATION: Isotopes and Atomic Mass
98.93
10
8
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)
43.5 c
97.5 c
100.1 c
18 c
8 c
5 c
18.8
cm 5.2
cm
15.7
cm
20.3
cm
7 g 8
g 4 g
20 g
21 g
30 g
4 g
25 g
110.3 f
207.5 f
212.18 f
64.4 f
46.4 f
41 f
188
mm 52
mm
157
mm
203
mm
8.5 g
8.7 g
5.5 g
18.0 g
23.4 g
33.4 g
9.0 g
25.8 g
0.188
m
0.052
m
0.157
m
0.203
m
316.65 K
370.65 K
373.25 K
291.15 K
281.15 K
278.15 K
0.0085 kg
0.0087 kg
0.0055 kg
0.018 kg
0.0234 kg
0.0334 kg
0.0090 kg
0.0258 kg
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
4.3 g
4.3 G
8.1 G
5
mL
5
mL
8.1 G
4.3 G
2.5 cm
18.5 g
18.5 g
7.1 ML
6.1 ML
.5 cm
23.5 G
23.5 G
23.5 g
23.5 g
9 ML
7 ML
.5 cm
9 ML
7 ML
5 g
5 g
0.625 cm3
2.1 ML
.7 ML
72.9
30.1
6.88
9.03
5.67
1 g/mL0.01
1 g/mL0.01
CHEM 108
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Post-Laboratory Questions
C.
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.
100(102-100/100)=2 % error
100(99.2-100/100)=0.08 % error
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)?
V= 3.6*4.21*1.17 = 17.73252 cm3
D=m/v= 21.3/17.73252 = 1.2g/mL
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?
Atmospheric pressure changes with sea level, so being above sea level decreases the pressure
which decreased the degree needed to boil water.
CHEM 108
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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?
26.15/19.30 = 1.355 g/mL
E.What would happen if you dropped the object into the beaker while using the Archimedes’
Principle method instead of submerging the object?
When you drop the object in the water the volume could decrease because some of the liquid
could be displaced out of the beaker. When using archimedes’ principle, if the incorrect
volume is displaced, the entire result would be inaccurate.
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?
Using the archimedes’ principle had higher density that the calculated volume, The principle is
more accurate than the calculated method because of the reduction of error.
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 the gold above can be compared to the known density of gold.
6.0/0.40 = 15 g/mL
