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Chapter 1 - Title

Chapter 1 - Title. Demo Week II. “Whoosh Bottle”. Bottle, alcohol, match 2 effects Detonation “whoosh’ thrust (methanol) Burning Cone/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.

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Chapter 1 - Title

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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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