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Whoosh Bottle Experiment: Exploring Combustion and Rocket Physics

The "Whoosh Bottle" experiment demonstrates chemical reactions and combustion principles using a bottle, alcohol, and a match. A mixture of methanol, ethanol, and propanols creates a dramatic detonation and thrust effect. This experiment highlights the importance of safety measures, including avoiding glass, using air instead of oxygen, and the proper handling of pressurized materials. The procedure involves preparing a dry jug, adding a precise amount of methanol, and calculating the necessary hydrogen to oxygen ratio for complete combustion in a rocket setup.

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Whoosh Bottle Experiment: Exploring Combustion and Rocket Physics

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  1. Chapter 1 - Title Demo Week II

  2. “Whoosh Bottle” • Bottle, alcohol, match • 2 effects • Detonation“whoosh’ thrust (methanol) • BurningCone/ring of fire (propanol) • Depends on v.p., • All burn if diluted • Fortman et al, 1999; Campbel et al., 2001 methanol > ethanol > 2-propanol > propanol

  3. Safety • No glass • Shatters • Use air, NOT oxygen • Do not heat • Pressurized • Avoid spray • Excess liquid melts the bottle • Extinguish with cap • Goggles and safety shield

  4. Procedure • Add wheels • Jug MUST be dry • Add 0.75 mL methanol • Cap and slosh • Wait 20 mins

  5. Rockets (Making Water) • Fuel HCl(aq) + Zn(s)  ZnCl2(aq) + H2(g) • Ignition 2H2(g) + O2(g)  2H2O(l)

  6. Calculation • Atmosphere provides 1 O2 molecule out of 5 we let in the bottle, Determine what ratio of H2 to air in a 2L bottle will provide a 2:1 ratio of H2:O2. • Ratio O2 : N2 in air __ : __ • Ratio of Hydrogen : Oxygen in our rocket required for complete combustion __ : __ • Ratio of Hydrogen : Air in our rocket required for complete combustion __ : __ (a : b) __/__ : __/__ (divide by the total a+b) __% : __%

  7. ff

  8. Solution • 2H2 + O2 2H2O 2 : 1 2 • Need 2 hydrogen molecules for every oxygen molecule • From air: 1 O2 for every 5 molecules of air we let in • Ratio of Hydrogen : Oxygen in our rocket required for complete combustion 2 : 1 • Ratio of Hydrogen : Air in our rocket 2 : 5 2/7 : 5/7 30% : 70% • [1] ~ 570 mL of H2 and 1430 mL of air.

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