Glow Stick

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by brockman7
Last updated 6 years ago

Discipline:
Science
Subject:
Chemistry

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Glow Stick

Hypothesis:My prediction having to do with my experiment was that the cold would decrease the reaction causing it to die out the fastest.

Glow StickDoes temperature affect the chemical reaction?

HISTORYIn the 1960's, Edwin Chandross of Bell Labs invented the glow stick originally trying to imitate the natural bioluminescence of the firefly. With the right combination of chemicals, he created a chemiluminescent substance. There have been many improvements since the original glow stick. Now, glow sticks can vary in color and size, and last a lot longer. Also, the chemicals have been altered for safety. Some of the chemicals used in older glow sticks were thought to be potential carcinogens

The Chemistry behind “The Glow” Glow sticks consist of an outer flexible tube with a smaller brittle glass tube within. Each vessel holds a different solution that when combined, react with each other. Two chemicals, diphenyl oxalate and hydrogen peroxide and a form of dye are present in the glow stick. The mixture of these chemicals, produces two molecules of phenol and one molecule of peroxyacid ester. The peroxyacid turns into carbon dioxide exciting the dye. This then relaxes by releasing a wavelength of a photon. The reaction that is produced gives off an entertaining glow as well as very little heat

My experimentTo show how temperature affects chemical reactions. I recorded results of four glow sticks placed in differing temperatures. One was placed in water on the stove, one at room temperature, one in the fridge and the last one was placed in the freezer. I recorded the time and levels of brightness every few hours.

Modern Technology

Connection to Curriculum Heat speeds up reactions which is what caused the glow stick on the stove to die the fastest. However, it also shone the brightest for a brief period of time. The cooler the temperature a chemical reaction faces, the more drawn out it becomes. Cold slows down the reaction causing the glow to last longer, although not as bright. Also, this reaction is neither endothermic or exothermic. It is classified as exergonnic and is an example of chemiluminescence.

7 hours

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physical science 20


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