3QuestionDo glow sticks glow brighter in warmer temperatures or colder temperatures?
4HypothesisIf the luminescence of glowsticks is measured at different temperatures,then the glowsticks will display increased luminescence, measured in volts, as the temperature increases
5Background Information The main chemical in glow sticks in luminol.Luminol is composed of carbon, hydrogen, nitrogen, and oxygenWhen 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.
7Procedure Assemble Sensor Set up water baths Set up each glow stick at its designated temperature
8Independent Variable: temperature of water Dependent Variable: amount of luminescence (voltage) given off by glow sticksConstants: jar, sensor, probe
9Data for 40°C Water 40°C 43.6°C 8volts 41.7°C 10volts 42.6°C 42.4°C
10Data for 35°C Water 35°C 35.6°C 7volts 35.4°C 5volts 35.5°C 6volts
11Data for 24°C Water 24°C 25.9°C 4volts 23.1°C 5volts 23.0°C 24.2°C
12Data for 15°C Water15°C16.7°C0volts15.9°C16.2°C17.1°C17.9°C
13AveragesThis 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.
14AveragesThis 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.
15TrendThis 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.
16Inconsistencies Environment Defect in the water bath
17ConclusionQuestion- Do glow sticks glow brighter at higher temperature or lower temperature?Answer- Glow sticks glow brighter at a higher temperature.The hypothesis was supported
18ReferencesCasciato, C. (2010, July 16). Ten things to know if you’re going to Global Dance Festival. Retrieved January 14, 2011, fromChaplin, E. (2009, December 1). What Chemicals are in glow sticks? Retrieved October 6, 2010, from Demand Media Property website:The chemical reaction. ( ). How luminol Works. Retrieved October 7, 2010, from Discovery Company website:Chemiluminescence . (n.d.). Retrieved 2010, from JRank website:Leland, J. K., Nacamulli, L., & Yang, H. (2002). Chemiluminescence. In McGraw Hill Encyclopedia of Science and Technology (Vol. 4, pp ). McGraw-Hill.What does luminol do? ( ). How luminol Works. Retrieved October 7, 2010, from