The Group

Reaction Chemistry Initial reaction used:

6HCl(aq) + 2Al(s) 2AlCl3(aq) + 3H2(g)

Final reaction used:HCl(aq) + NaHCO3(s) CO2(g) + H2O(l) +

NaCl(aq)

Calculations 12ml HCl = 0.1452 mol HCl = 0.1452 mol NaHCO2

0.1452 mol NaHCO2 = 12.1975g NaHCO2

Pressure calculated = 4.98672 atm

13ml HCl = 0.1573 mol HCl = 0.1573 mol NaHCO2

0.1573 mol NaHCO2 = 13.2144g NaHCO2

Pressure calculated = 5.4023 atm

Car Design

Testing ResultsTrial

Number HCl (ml) Water (ml)

Baking Soda (g)

Feet traveled

Modi-fications for next

trial

1 13 21 13.220 0 Small wheels

2 13 21 13.220 .5 Wait to open valve

3 13 20 13.222 6 none

4 13 20 13.219 0New

calculations

5 12 15 12.200 0

Wheels attached to axel, new tape on

nozzle of bottle

6 12 15 12.198 24 none-No spew all runs

Performance Results (Wednesday, December 2, 2009)

Trial Number HCl (ml) Water

(ml)Baking

Soda (g)Distance traveled Spew

1 12 15 12.20 17’10” No

2 13 16 13.047 27’5” No

3 12.75 16 12.701 13’0”Some due to hand

fault

4 12.75 16 12.700 25’0” No

Performance Results (Wednesday, December 2, 2009)

25 feet exactly

Performance Results(Friday, December 4, 2009)

Trial Number HCl (ml) Water

(ml)Baking

Soda (g)Distance traveled

1 12.75 16 12.700 18’7”2 12.75 16 12.700 18’5”3 13 16 13.200 15’

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.

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.