event 3: chemical engineering chem-e-car river dell high school team a (rdhsa) celyne moh daniel...
TRANSCRIPT
Event 3: Chemical EngineeringChem-E-Car
River Dell High School Team A (RDHSA)
Celyne MohDaniel Ross
Ronald Vertsman
Objective
“Design and construct a car that is powered with a chemical energy source that will travel a given distance and stop. ”
• Commercial batteries (for example, AA batteries) are allowed as the power source if a controlled chemical reaction is used elsewhere in the car’s system (as a stopping mechanism, for example).
Concept
• Iodine clock reaction
• Using a light and photo-sensor to control a motor
KineticsIodine clock:
Step 1: IO3
− (aq) + 3 HSO3
− (aq) I−
(aq) + 3SO42−
(aq) + 3H+ (aq)
Step 2: IO3
− (aq) + 5 I− (aq) + 6 H+ (aq) 3 I2 (aq) + 3 H2O (l)
Step 3: I2 (aq) + starch {a dark blue iodine/starch complex}
Rate = k[NaHSO3]2[KIO3]1 k = 188.04
Allocation of Budget
Item Price
100g Potassium Iodate $17.01
500g Sodium Bisulfite $9.70
500g Starch, Reagent
Soluble$55.60
AAA batteries (20 Batteries) $7.07
Distilled Water (3 Bottles) $2.64
Total $92.02
Construction
• Fiberglass Cylinder
• Batteries
• Circuitry
• Old RC car
• Plexiglas©
• Copper wiring
Circuitry
Kinematics• Photo-sensor• Colors of solutions
Distance Traveled = velocity x time
The proper concentrations for the reactants is determined so the car travels a given distance.
Conclusion
• Car veers too mucho Axle
• Time of trial varies = distance varieso Concentration of solutionso Human Erroro Splashing
Reconstruction (2nd model)
• Car veeringo Replace axleo Replace wheels
• Varying distanceso countdown
Observations (2nd model)
• Car veered less
• Car ran varying distances
Results (2nd model)
14 15 16 17 18 19 20 2115
20
25
30
35
40
mL NaHSO3
Dis
tan
ce (
feet)
Conclusion (2nd model)
• Car Veeringo The axle
• Varying distanceso Momentum o Countdown
Reconstruction (3rd model)
• Front wheel
• Reduce concentration of solutions
• Change variable reactant
• Cork
• Syringe
Observations (3rd model)
• Car runs straight
• Trials are more precise
• Trials are more accurate
• Solutions are not spilling
Final Conclusion
• Car stops within 5ft of destination
• Car runs too fast for complete accuracy
Questions?