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Glow Stick Chemistry

Glow Stick Chemistry. Ask the Question. How does the surrounding temperature of a glow stick affect the intensity of the glow?. Glow stickVariables:. What is the Independent Variable for this experiment? What is the Dependent Variable for this experiment? What are the constants?.

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Glow Stick Chemistry

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  1. Glow Stick Chemistry

  2. Ask the Question How does the surrounding temperature of a glow stick affect the intensity of the glow?

  3. Glow stickVariables: What is the Independent Variable for this experiment? What is the Dependent Variable for this experiment? What are the constants? IV: The surrounding temperature of the glow stick. DV: How bright the glow stick is. Constants: Styrofoam cup, thermometer, glow stick, and amount of time.

  4. Background Research • A glow stick is made up of a plastic tube with a glass vial in it. • When you bend the plastic, you break the glass vial, allowing the chemicals to mix!

  5. Background Research • A compound called Hydrogen Peroxide is inside the glass vial. • Two chemicals are outside the vial: Phenyl Oxalate Ester and Fluorescent Dye Solution.

  6. Background Research • When the compounds mix, a chemical reaction occurs. • This releases energy and causes the fluorescent dye to glow (same as a firefly). • The faster the reaction occurs, the brighter the glowstick. When the reaction is over, the glowstick stops glowing! • Temperature affects the reaction. Today we will find out how temperature affects how bright a glowstick will glow.

  7. Hypothesis Write down your hypothesis on pg. -- of your c.b. Remember to use an “If ------- then ----- “ format. For example: If the outside temperature is warm, then the glowstick will be _______. (brighter? dimmer?)

  8. Data Table Create a data table under your hypothesis on pg. --: Group: ____

  9. Conduct the Experiment • Fill Styrofoam cup with 1 cup of : (ice OR hot water OR air) on the table • When directed by your teacher, break the glow stick and place it in the cup at your desk. • Measure the temperature in your data chart (for your experimental group) • Once the glow stick is in the cup, do not touch it!

  10. Compare Variables • When directed to, send your data manager to compare your glow stick with two other temperature groups in your class and record results in your data table. • Make sure you get their temperature data too! • If your glow stick is the brightest, write down “3”, if it is the 2nd brightest, write “2”, and if it is the dimmest, write “1”.

  11. Analyzing Data and Graphing • When asked to, enter your data in the excel chart at the front of the room. • Choose “3” for the brightest, “2” for the 2nd brightest, and “1” for the dimmest.

  12. Drawing Conclusions • Use complete sentences to Answer conclusions on pg. -- of your c.b. CONCLUSION: • Was your hypothesis supported or rejected? • Explainyour answer to question #1 using data. • How does the surrounding temperature of a glow stick affect the intensity of the glow? Use the data to support your results. • What are some human errors that could have affected your data? EXPLANATION: • How did the research support your results? FURTHER QUESTIONS: • What are some further questions?

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