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Car Design We ended up with a great design, but to arrive there, we had to rebuild the entire car from scratch. (The old design would run only 15 feet at the most) Here’s a work in progress: very close to the final design.
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By Cameron Oden, Shannon Cahill-Weisser,
and Melissa Simpson
CBE 101 8th Annual
Reaction Car Competition
Reaction ChemistryHydrogen Peroxide & Pyrolusite
Chemical Equation:H₂O₂ (aq) + MnO₂ (s) → H₂ (g) + O₂ (g) + MnO₂ (s)Pressure:(.020 L)(8 mol/L)(1 mol H₂O₂/1 mol H₂) = 0.08 moles H₂ & 0.08 moles O₂P = [(0.16 mol)(0.08205 L-atm/mol-k)(293 K)]/(.700 L) = 5.5 atm
We did not use this reaction because when we tested it, the gas was not produced quickly enough to be efficient for running the car.
Hydrochloric Acid & Baking SodaChemical Equation:HCl (aq) + NaHCO₃ (s) → NaCl (aq) + H₂O (l) + CO₂ (g)Pressure:(0.012 L)(12.1 mol/L)(1 mol HCl/1 mol CO₂) = .1452 moles CO₂P = [(.144 mol)(0.08205 L-atm/mol-K)(293 K)]/(.700 L) = 4.99 atm
We also added 12.5-13 mLs of water to help the reaction.
Car DesignWe ended up with a great
design, but to arrive there, we had to rebuild the entire car from scratch. (The old design would run only 15 feet at the
most)
Here’s a work in progress: very close to the final design.
Test Results
During our open lab time, while we tested different reaction ideas and
different car ideas, our data was very inconsistent. We found that a simple
change in the nozzle makes the difference between a car that curves vs.
a car that runs straight. We also discovered that miniscule changes in
amounts of water to our reaction impacted our results in a major way. With no water added, the car would travel ten feet at the most. When we
added 12mLs of water, on average, the car traveled about 21 feet, and with
13mLs of water, the car traveled close to 25 feet on average.
Open Lab Testing Semi-finals and Finals
Semi-finals (3rd Place) HCl
(mL)NaHCO3 (g)
H2O (mL)
Distance (ft) Comments
Semi-
Finals
12 13 12.5 20'veered towards the right into
the grass 23' 7" 20'
12 1312.7
5 19' 1" 12 13 13 ? kim wipe got stuck in nozzle 20' 2"
26' 10"
FinalsHCl (mL)
NaHCO3 (g) H2O (mL)
Distance (ft)
Finals 12 13 12.5 22' 3'' 13 26' 8'' 12.75 24' 5''
NO SPEW!!!
Conclusions•During the semi-finals and finals section of this
project, our car performed very well. It was also fairly consistent. During the finals we
consistently ran between 22 and 27 feet.•We learned that changes in volumes of water as small as 0.5mLs can make a difference in
distance of around four feet.•At the end of this project, our car was at its best.•Without using different materials, we wouldn’t have been able to make the car more efficient or reliable.•For people who’s cars weren’t running efficiently, keep in mind: •Check the nozzle (cap)•Make sure the car is sturdy•Make sure the wheels are aligned