edu 520 assignment #3: abridged curriculum unit daniel barnes and anita reviczky stoddard...
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EDU 520 Assignment #3: Abridged Curriculum Unit
Daniel Barnes and Anita Reviczky Stoddard
Presentation Delivery Date = 10/11/2012
Put the balance on a level surface.
Slide all the masses to
If the two white linesdon’t touch,
Rotate the screw under the pan until the white linesdo line up.
zero.
0 10 20 30 40 50 60 70 80 90 g100
0 100 200 300 400 500g
0 1 2 3 4 5 6 7 8 9 10
Triple Beam Balance Demonstrator by Daniel R. Barnes, init 9/18/2006
Ok. I get it. That’s enough practice reading the numbers.
413.0 grams
5
10
15
20
25
30
35
40
45
50
42 mL44 mL40.2 mL402 mL
5
10
15
20
25
30
35
40
45
50
Vi = 38.0 mL
Vf = 47.2 mL
V = Vf - Vi
47.2- 38.0 9.2
V = 9.2 mL
What is the volume of the crown?
Let’s use the displacement method.
Analysis Table 1A Beaker # # of
pennies Density (g/mL)
A-1
10
7.6
A-2
13
7.2
A-3
13
8.1
A-4
17
6.7
A-5
18
7.5
A-6
21
6.6
A-7
20
7.2
A-8
23
6.8
A-9
24
7.5
A-10
28
7.7
Average
7.3
Analysis Table 1B Beaker # # of
pennies Density (g/mL)
B-1
10
1.0 x 101
B-2
11
8.4
B-3
13
8.2
B-4
19
9.5
B-5
15
9.1
B-6
22
8.4
B-7
21
9.2
B-8
24
8.7
B-9
25
8.6
B-10
32
8.7
Average
8.9
Analysis Table 2
Beaker Experimental
density (g/mL)
Cu D=8.9 g/mL
Zn D= 7.1 g/mL
Expected density (g/mL)
% error
A
7.3
0.8%
99.2%
7.1
2.8%
B
8.9
95.0%
5.0%
8.8
1.1%
Density of pennies
0.00
20.00
40.00
60.00
80.00
100.00
120.00
0.0 5.0 10.0 15.0
volum e (m L)
ma
ss
(g
)
A pennies
B pennies
Linear (Bpennies)
Linear (Apennies)