Launching Soda Bottle Rockets using Hydrogen Oxygen Steve

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

Photo of hydrogenpowered soda bottle rocket in flight Photo credit = Cameron Zuziak, LBHS class of 2014

Electronic Ignition • Students make electronic fuses from aluminum foil—this allows for safe, reliable ignition. http: //youtu. be/m. RMy. Mwntb 8 c

Synopsis of Student Tasks 1. Balance equation for combustion of H 2 2 H 2 (g) + O 2 (g) 2 H 2 O (g) 2. Measure volume of bottle (they aren’t 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

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 Ea values) H = -95 k. J/mol H 2 O 2

Synopsis of Student Tasks (part 3) 7. Stoichiometry for generating H 2 (g) a) b) c) d) Balance eqn for rxn of Ca with H 2 O Determine mass of Ca needed Determine volume of H 2 O needed Calculate k. J 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

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

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

Use of instructional videos • Three instructional videos help students do the right things: – Making fuses http: //youtu. be/ea. Vy. Cz 5 Bqro – Generating gases http: //youtu. be/hy. MHLUUH 1 Zg – Launch pad procedures http: //youtu. be/28 z. Oejq. Re 6 s

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

Address Questions To: • Steve Sogo, Laguna Beach High School • ssogo@ lbusd. org • You. Tube Channel = ACR 92651