the glow-in-the-dark spark measuring the luminescence in glow sticks sarah maloney
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The Glow-in-the-Dark SparkMeasuring the Luminescence in Glow Sticks
Sarah Maloney
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Question
• Do glow sticks glow brighter in warmer temperatures or colder temperatures?
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Hypothesis
• If the luminescence of glowsticks is measured at different temperatures,then the glowsticks will display increased luminescence, measured in volts, as the temperature increases
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Background Information
• The main chemical in glow sticks in luminol. • Luminol is composed of carbon, hydrogen,
nitrogen, and oxygen• When an atom is excited the electrons go up in
energy and energy levels. When they fall back down to their normal spot, they release energy in the form of light photons. The more heat applied to the electrons the more sped up they get, so when they fall back down to their normal energy level they release more light.
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Materials
• Jar
• Sensor
• Water bath
• Ice bath
• Glow sticks
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Procedure
• Assemble Sensor
• Set up water baths
• Set up each glow stick at its designated temperature
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• Independent Variable: temperature of water
• Dependent Variable: amount of luminescence (voltage) given off by glow sticks
• Constants: jar, sensor, probe
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Data for 40°C Water
40°C 43.6°C 8volts
41.7°C 10volts
42.6°C 10volts
42.4°C 9volts
43.1°C 9volts
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Data for 35°C Water
35°C 35.6°C 7volts
35.4°C 5volts
35.5°C 6volts
35.8°C 6volts
35.6°C 5volts
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Data for 24°C Water
24°C 25.9°C 4volts
23.1°C 5volts
23.0°C 4volts
24.2°C 4volts
24.6°C 5volts
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Data for 15°C Water
15°C 16.7°C 0volts
15.9°C 0volts
16.2°C 0volts
17.1°C 0volts
17.9°C 0volts
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Averages
• This graph shows the average voltage for each temperature of water that the glow sticks were placed in. Notice that the voltage of the glow sticks increases as the temperature increases. This suggests that when a glow stick is placed in a hotter temperature, it will glow brighter than when it is
placed in a colder temperature.
0
1
2
3
4
5
6
7
8
9
10
Voltage
40C 35C 24C 15C
Temperature
Average Voltage of Glow Sticks at Different Temps.
Series1
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Averages
• This graph shows the average voltage of the glow sticks at different temperatures with error bars. Notice that the error bars do not overlap showing that the results were accurate. This suggests that when the temperature is warmer, the voltage will be higher in the glow stick.
Average Voltage of Glow Sticks at Different Temps.
0
2
4
6
8
10
12
40C 35C 24C 15C
Temperature
Vo
lts
Series1
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Trend
• This graph shows a trend that forms from the data of this experiment. The trend line of this graph shows that as the temperature of the water decreases, the voltage of each glow stick increases. This also verifies that the hypothesis was supported.
Voltage at Different Temps.
0
2
4
6
8
10
12
43.6C
41.7C
42.6C
42.4C
43.1C
35.6C
35.6C
35.4C
35.5C
35.8C
35.6C
25.9C
23.1C
23.0C
24.2C
24.6C
Temperature
Vo
ltag
e
Volts
Linear (Volts)
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Inconsistencies
• Environment
• Defect in the water bath
http://www.gannon.edu/resource/dept/sim/new/biologyequip.ihtml
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Conclusion
• Question- Do glow sticks glow brighter at higher temperature or lower temperature?
• Answer- Glow sticks glow brighter at a higher temperature.
• The hypothesis was supported
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References• Casciato, C. (2010, July 16). Ten things to know if you’re going to Global
Dance Festival. Retrieved January 14, 2011, from http://blogs.westword.com/ backbeat/ 2010/ 07/ ten_things_to_know_if_youre_going_to_global_dance_festival_denver.php
• Chaplin, E. (2009, December 1). What Chemicals are in glow sticks? Retrieved October 6, 2010, from Demand Media Property website: http://www.ehow.com/ about_5241805_chemicals-glow-sticks_.html
• The chemical reaction. (1998-2010). How luminol Works. Retrieved October 7, 2010, from Discovery Company website: http://science.howstuffworks.com/ luminol2.htm
• Chemiluminescence . (n.d.). Retrieved 2010, from JRank website: http://www.chemistryexplained.com/ Ce-Co/ Chemiluminescence.html
• Leland, J. K., Nacamulli, L., & Yang, H. (2002). Chemiluminescence. In McGraw Hill Encyclopedia of Science and Technology (Vol. 4, pp. 52-54). McGraw-Hill.
• What does luminol do? (1998-2010). How luminol Works. Retrieved October 7, 2010, from http://science.howstuffworks.com/ luminol1.htm