Question
Answer the following about dye-sensitized solar cells, which were explicitly designed to mimic photosynthesis, for 10 points each.
[10e] The ruthenium dye in a solar cell replaces these green pigments that eject electrons when plants are exposed to sunlight.
ANSWER: chlorophylls [or chlorophyll a or chlorophyll b]
[10m] Solar cells recover the lost electrons by converting iodide ions at a minus-one oxidation state, to this non-integer oxidation state found in the an·ion tri·iodide, or I3− (“I three (pause) minus”).
ANSWER: -1/3 [or negative one-third; or one-third minus; or minus one-third; reject “one-third” by itself]
[10h] Dye-sensitized solar cells conduct electrons using nanoparticles containing this metal. This metal’s highly reflective dioxide is also useful for photocatalytic water splitting.
ANSWER: titanium [or titanium dioxide; or titania; or Ti]
<Adam Silverman, Science - Chemistry> ~20847~ <Editor: Adam Silverman>
Summary
| 2023 PACE NSC | 06/10/2023 | Y | 35 | 15.14 | 94% | 29% | 29% |
Data
| Thomas Jefferson B | Barrington B | 10 | 0 | 0 | 10 |
| Maggie Walker C | Canyon Crest | 10 | 0 | 0 | 10 |
| Rockford Auburn A | Carbondale | 10 | 0 | 0 | 10 |
| Chattahoochee A | Winston Churchill B | 10 | 10 | 0 | 20 |
| Chattahoochee B | William Fremd | 10 | 10 | 10 | 30 |
| Moberly | Choate Rosemary Hall | 10 | 0 | 0 | 10 |
| Dunbar | Cincinnati Hills Christian | 10 | 0 | 0 | 10 |
| Rockford Auburn B | Dallas County | 10 | 0 | 0 | 10 |
| Winnebago | Detroit Country Day | 10 | 0 | 0 | 10 |
| Heights | Stevenson B | 10 | 0 | 10 | 20 |
| Hunter A | Washington | 10 | 0 | 0 | 10 |
| Innovation Academy B | Plymouth | 10 | 0 | 0 | 10 |
| Irvington A | Norman | 10 | 10 | 0 | 20 |
| Maggie Walker A | John Adams A | 10 | 0 | 10 | 20 |
| Johns Creek A | Hoover B | 10 | 0 | 10 | 20 |
| Johns Creek B | Elkhorn North | 10 | 10 | 0 | 20 |
| Belmont | Lake Highland | 10 | 10 | 0 | 20 |
| Thomas Jefferson A | Lincoln-Way East | 10 | 10 | 10 | 30 |
| Kinkaid | Maggie Walker B | 10 | 0 | 0 | 10 |
| Mexico | Detroit Catholic Central B | 0 | 0 | 0 | 0 |
| Mercer County | Mira Loma | 10 | 10 | 0 | 20 |
| Norris | Midtown | 10 | 0 | 0 | 10 |
| Northmont A | Detroit Catholic Central C | 10 | 0 | 10 | 20 |
| Northmont B | Innovation Academy A | 10 | 0 | 10 | 20 |
| Parkway West | Saint Joseph | 10 | 0 | 0 | 10 |
| Richard Montgomery | Hunter B | 10 | 0 | 0 | 10 |
| Solon | Stevenson A | 10 | 0 | 0 | 10 |
| St. Mark's | Belvidere | 10 | 0 | 10 | 20 |
| Troy | Hinsdale Central | 10 | 0 | 0 | 10 |
| University Lab | Thomas Jefferson D | 10 | 10 | 10 | 30 |
| Detroit Catholic Central A | Walter Payton | 10 | 0 | 0 | 10 |
| Thomas Jefferson C | Waukee | 0 | 10 | 10 | 20 |
| Barrington A | West Point | 10 | 10 | 0 | 20 |
| New Brighton | Winston Churchill A | 10 | 0 | 0 | 10 |
| Woodland | John Adams B | 10 | 0 | 0 | 10 |