2. The Group

3. Reaction Chemistry  Initial reaction used: 6HCl(aq) + 2Al(s)  2AlCl 3 (aq) + 3H 2 (g)  Final reaction used: HCl(aq) + NaHCO 3(s)  CO 2 (g) + H 2 O(l) + NaCl(aq)

4. Calculations  12ml HCl = 0.1452 mol HCl = 0.1452 mol NaHCO 2  0.1452 mol NaHCO 2 = 12.1975g NaHCO 2  Pressure calculated = 4.98672 atm  13ml HCl = 0.1573 mol HCl = 0.1573 mol NaHCO 2  0.1573 mol NaHCO 2 = 13.2144g NaHCO 2  Pressure calculated = 5.4023 atm

5. Car Design

6. Testing Results Trial Number HCl (ml)Water (ml) Baking Soda (g) Feet traveled Modi- fications for next trial 1132113.2200Small wheels 2132113.220.5 Wait to open valve 3132013.2226none 4132013.2190 New calculations 5121512.2000 Wheels attached to axel, new tape on nozzle of bottle 6121512.19824none -No spew all runs

7. Performance Results (Wednesday, December 2, 2009) Trial Number HCl (ml)Water (ml) Baking Soda (g) Distance traveled Spew 1121512.2017’10”No 2131613.04727’5”No 312.751612.70113’0” Some due to hand fault 412.751612.70025’0”No

8. Performance Results (Wednesday, December 2, 2009) 25 feet exactly

9. Performance Results (Friday, December 4, 2009) Trial Number HCl (ml)Water (ml) Baking Soda (g) Distance traveled 112.751612.70018’7” 212.751612.70018’5” 3131613.20015’ No spew all trials We assume our bottle was starting to wear and could not hold the pressure which we needed to propel our car forward. We tried different caps, but were still losing some pressure before every run.

10. Conclusion  Our car had a very simple design that allowed us to attach the bottle to the car quickly and smoothly.  The car rolled well, but we still could have tried to find a way to make the friction of the axel less which would have allowed the car to roll even smoother.  Near the end of the competition our bottle started to leak gas, lessening the pressure. We should have gotten a new bottle and cap to use to ensure that no pressure was lost.  Our car performed better than we expected by reviewing the results in our trial runs. We were very pleased with its performance and making it to the finals.