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Launching Soda Bottle Rockets using Hydrogen + Oxygen Steve Sogo Laguna Beach High School

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Photo of hydrogen- powered soda bottle rocket in flight Photo credit = Cameron Zuziak, LBHS class of 2014

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Electronic Ignition Students make electronic fuses from aluminum foilthis allows for safe, reliable ignition. http://youtu.be/mRMyMwntb8c http://youtu.be/mRMyMwntb8c

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Synopsis of Student Tasks 1.Balance equation for combustion of H 2 2.Measure volume of bottle (they arent precisely 2.00-liters!) 3.Use mole ratios to determine volumes of H 2 and O 2 needed to fill the bottle 4.Use ideal gas law to determine moles of gases needed 2 H 2 (g) + O 2 (g) 2 H 2 O (g)

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Synopsis of Student Tasks (part 2) 5.Stoichiometry for generating O 2 (g) a)Balance equation for decomposition of H 2 O 2 b)Determine mass of H 2 O 2 required c)Determine volume of 10% H 2 O 2 solution required 6.Graph energy profile for catalyzed and uncatalyzed decomposition reaction (given H and E a values) H = -95 kJ/mol H 2 O 2

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Synopsis of Student Tasks (part 3) 7.Stoichiometry for generating H 2 (g) a)Balance eqn for rxn of Ca with H 2 O b)Determine mass of Ca needed c)Determine volume of H 2 O needed d)Calculate kJ of heat produced in the reaction 8.Why use excess H 2 O? 9.How to compensate for oxidized calcium? 10. After launching, sketch energy profiles and explain why the rocket launches

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The bottle makes a difference! Two outcomes are possiblea rocket that launches into the sky (soda bottle) or a bomb that explodes impressively (water/juice/milk bottle)

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Time for a video! o http://youtu.be/rFakqDf-Bwc http://youtu.be/rFakqDf-Bwc This student-filmed video shows load and launch activities (done in a 90 minute class period)

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Use of instructional videos Three instructional videos help students do the right things: Making fuses http://youtu.be/eaVyCz5Bqrohttp://youtu.be/eaVyCz5Bqro Generating gases http://youtu.be/hyMHLUUH1Zghttp://youtu.be/hyMHLUUH1Zg Launch pad procedures http://youtu.be/28zOejqRe6s http://youtu.be/28zOejqRe6s

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AACT will help distribute this lab The Rocket Lab was honored as a Grand Prize winner in the Best Of submissions to the American Association of Chemistry Teachers. Student instruction pages and teacher notes will be provided through the AACT website

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Address Questions To: Steve Sogo, Laguna Beach High School ssogo@ lbusd.org YouTube Channel = ACR92651