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

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Presentation transcript:

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

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

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

Rockets (Making Water) Fuel HCl(aq) + Zn(s)  ZnCl 2 (aq) + H 2 (g) Ignition 2H 2 (g) + O 2 (g)  2H 2 O(l)

Calculation Atmosphere provides 1 O 2 molecule out of 5 we let in the bottle, Determine what ratio of H 2 to air in a 2L bottle will provide a 2:1 ratio of H 2 :O 2. Ratio O 2 : N 2 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) __% : __%

ff

Solution 2H 2 + O 2  2H 2 O 2 : 1 2 Need 2 hydrogen molecules for every oxygen molecule From air: 1 O 2 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 H 2 and 1430 mL of air.