Packet 7: Bonus 9
Pencil and paper ready. For 10 points each, answer the following about a reaction in a Daniel cell, a type of galvanic cell.
[10m] A Daniel Cell commonly consists of copper and this other metal. This metal coats steel or iron in a process called galvanization.
ANSWER: zinc [accept Zn]
[10e] Since the copper electrode is in the half-cell where reduction occurs, it takes the role of this electrode, while the zinc electrode is the anode.
ANSWER: cathode
[10h] Given that the cell potential is +1.1 (“positive one point one”) volts and Faraday’s constant can be rounded to 100,000 coulombs per mol, find the free energy of the reaction. You have 10 seconds, and your answer should be in kilojoules per mol.
ANSWER: -220 kJ/mol (“negative 220 kilojoules per mol”) [accept any answer between -212.3 kJ/mol and -220 kJ/mol; reject answers that do not include a negative sign like “220 kilojoules per mol”]
<Science - Chemistry, Rohan Ganeshan> | VAULT II Packet 07
| Heard | PPB | E % | M % | H % |
|---|---|---|---|---|
| 44 | 15.91 | 86% | 71% | 2% |
Conversion
Summary
| Tournament | Edition | Match | Heard | PPB | E % | M % | H % |
|---|---|---|---|---|---|---|---|
| VAULT II at Georgia Tech | 2026-01-24 | ✓ | 6 | 18.33 | 100% | 83% | 0% |
| Triangle Cup | 2026-03-13 | ✓ | 3 | 6.67 | 67% | 0% | 0% |
| VAULT II at Eden Prairie HS | 2026-03-13 | ✓ | 3 | 20.00 | 100% | 100% | 0% |
| VAULT II at McGill | 2026-03-13 | ✓ | 4 | 10.00 | 75% | 25% | 0% |
| VAULT II at UCSB | 2026-03-13 | ✓ | 5 | 16.00 | 80% | 80% | 0% |
| VAULT II Northern UK | 2026-04-24 | ✓ | 3 | 16.67 | 67% | 100% | 0% |
| VAULT II Southern UK | 2026-04-24 | ✓ | 4 | 17.50 | 100% | 75% | 0% |
| VAULT II at Harvard | 2026-04-30 | ✓ | 3 | 13.33 | 100% | 33% | 0% |
| VAULT II at MINT | 2026-06-19 | ✓ | 5 | 12.00 | 60% | 60% | 0% |
| VAULT II Stanford Online | 2026-07-17 | ✓ | 8 | 21.25 | 100% | 100% | 13% |