Recently students participated in a contest using the concepts they learned in the density unit. In the Density of Doom Challenge, students try to create a 100 milliliter salt and water solution that will cause a jewel (plastic bead) to rise from the bottom of a 100 ml graduated cylinder to the surface in exactly one minute. The lab group that comes the closest to the one minute goal is the winner. Students must learn to control the speed of the rising jewel by changing the density of their salt solution. This contest requires students to make precise measurements and to control variables. The results of the contest are below.

 

The 2000 Gallery of Contest Pictures

12-4-2000 Density of Doom Results

Congratulations to table six, period one, woo hoo! Madeline W., Tim B., Stephanie L., and Bruce Y. are the 2000 champs. Their time was an amazing 60.00 which can never be beat, boo-yah! This time establishes a new all time record. The previous all time record was .02 seconds from exactly 60 seconds. Awesome!

Density of Doom: Combined Data

Period & Table

Best Time (sec.)

How Close to One Minute (sec.)

P1 - Table 6

60.00 "New Record" Woo Hoo!

0.00

P2 - Table 5

59.96 "3rd Best Ever!"

0.04

P2 - Table 3

60.86

0.86

P2 - Table 8

62.41

2.41

P6 - Table 6

57.48

2.52

P5 - Table 5

56.88

3.12

P3 - Table 5

55.98

4.02

P2 - Table 4

55.87

4.13

P1 - Table 1

55.8

4.2

P6 - Table 2

64.52

4.52

P3 - Table 7

54.46

5.54

P5 - Table 3

52.55

7.45

P1 - Table 9

52.24

7.76

P6 - Table 3

51.5

8.5

P1 - Table 2

50.76

9.24

P2 - Table 1

69.5

9.5

P1 - Table 8

49.85

10.15

P5 - Table 2

48.33

11.67

P1 - Table 5

47.85

12.15

P1 - Table 3

46.88

13.12

P5 - Table 6

73.42

13.42

P3 - Table 3

46.19

13.81

P3 - Table 9

45.89

14.11

P6 - Table 9

76.55

16.55

P1 - Table 7

43.43

16.57

P2 - Table 9

41.41

18.59

P2 - Table 7

41.4

18.6

P5 - Table 8

41.39

18.61

P5 - Table 4

41.16

18.84

P3 - Table 4

39.69

20.31

P2 - Table 2

31.47

28.53

P5 - Table 9

31.38

28.62

P2 - Table 6

25.38

34.62

P6 - Table 4

24.32

35.68

P3 - Table 6

23.45

36.55

P6 - Table 1

20.28

39.72

P3 - Table 8

20.02

39.98

P6 - Table 8

102.48

42.48

P6 - Table 5

15.22

44.78

P1 - Table 4

6.04

53.96

P5 - Table 1

5.52

54.48

P3 - Table 1

120

60

P3 - Table 2

120

60

P5 - Table 7

120

60

P6 - Table 7

120

60

Average

21.5

Try out a cool online density experiment!

 D'oh! I think we used too much salt! :(

 

 

1998 Density of Doom Results

Congratulations to table four, period one. Jenna, Michigan, Brandie, and Michael are the 1998 champs. Their time was an amazing 59.98. It was only .02 seconds off the goal of 60 seconds. This time establishes a new all time record. The previous all time record was .05 seconds from exactly 60 seconds. Awesome!

Period and Table #
Time in seconds

How close to the one minute goal in seconds

Period 1: Table 4
59.98

.02

Period 2: Table 8
59.90

.1

Period 2: Table 4
59.61

.39

Period 4: Table 6
60.45

.45

Period 5: Table 2
59.03

.97

Period 2: Table 7
58.38

1.61

Period 1: Table 3
61.82

1.82

Period 2: Table 9
61.95

1.95

Period 3: Table 7
62.18

2.18

Period 5: Table 7
62.48

2.48

Period 1: Table 9
63.06

3.06

Period 4: Table 4
56.75

3.25

Period 4: Table 5
56.48

3.52

Period 5: Table 1
56.34

3.66

Period 4: Table 3
56.23

3.77

Period 4: Table 9
56.08

3.92

Period 2: Table 3
54.74

5.26

Period 1: Table 1
65.45

5.45

Period 1: Table 6
54.15

5.85

Period 4: Table 7
66.25

6.25

Period 4: Table 8
66.56

6.56

Period 1: Table 5
53.17

6.83

Period 3: Table 1
51.94

8.06

Period 2: Table 5
50.77

9.23

Period 4: Table 2
50.27

9.73

Period 5: Table 8
50.12

9.88

Period 1: Table 8
50.03

9.97

Period 5: Table 5
48.97

11.03

Period 1: Table 7
48.78

11.22

Period 5: Table 3
45.61

14.39

Period 1: Table 2
78.12

18.12

Period 3: Table 8
40.83

19.17

Period 3: Table 4
39.27

20.73

Period 4: Table 1
84.46

24.46

Period 3: Table 6
35.08

24.92

Period 2: Table 1
33.85

26.15

Period 3: Table 9
33.32

26.68

Period 3: Table 2
32.62

27.38

Period 5: Table 6
87.39

27.39

Period 5: Table 4
28.05

31.95

Period 2: Table 6
25.13

34.87

Period 3: Table 5
21.6

38.40

Period 3: Table 3
15.47

44.53

Period 2: Table 2
0

60.00

Period 5: Table 9
120

60.00

Class Average

14.17

Find the dead sea on the map to the left. The Dead Sea receives its water from the Jordan River to the north. Because there is no outlet for the water it sits there and evaporates leaving one of the highest concentrations of salt in any lake in the world.

Below is a satellite view of the Dead Sea. It is 400 meters below sea level making it the lowest point on the Earth's surface.
The picture below shows people floating in the Dead Sea. This lake is one of the saltiest lakes in the world. Regular ocean water has 35g of salt per liter (1,000 ml). The Dead Sea has 345g per liter (1,000 ml). Because of the high salt content and therefore high density, people can float very high on the Dead Sea's surface. Just like your jewel could float on the salt solutions in the Density of Doom contest.

 

 The Real World -Osteoporosis

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All groups did a good job trying to accomplish the one minute goal! Congratulations!

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