Question
A method of measuring zeta potential involves observing this process in an electric field. For 10 points each:
[10m] Name this process surveyed from multiple angles in “dynamic” and “static” methods of determining a polymer’s radius of gyration. A Zimm plot depicts the change in intensity due to this process.
ANSWER: light scattering [or word forms of scattered; accept dynamic light scattering, static light scattering, multi-angle light scattering, DLS, SLS or MALS]
[10e] This quantity’s distribution can be extracted from the autocorrelation of scattering intensity over time. This quantity can be measured in daltons.
ANSWER: molecular weight [accept molecular mass or molar mass; prompt on size or length]
[10h] The y-intercept of a Zimm plot can be divided into a term for weight and a term for this quantity times concentration. The BWR equation of state requires more constants to express this quantity than its relatives, but it only takes one Mayer f-function to express this quantity exactly.
ANSWER: second virial coefficient [or B2; or A2; prompt on virial coefficients]
<Chemistry>
Summary
| 2024 ACF Nationals | 2024-04-21 | Y | 22 | 13.18 | 77% | 32% | 23% |
Data
| Chicago A | Arizona State | 10 | 10 | 10 | 30 |
| Waterloo | Berkeley A | 10 | 10 | 0 | 20 |
| Brown | Ottawa | 10 | 10 | 0 | 20 |
| Columbia B | Chicago D | 0 | 10 | 0 | 10 |
| Cornell B | Georgia Tech | 0 | 0 | 0 | 0 |
| Duke | Johns Hopkins | 0 | 10 | 0 | 10 |
| North Carolina A | Florida | 0 | 10 | 10 | 20 |
| Chicago B | Harvard | 0 | 10 | 0 | 10 |
| Illinois | Chicago C | 10 | 10 | 10 | 30 |
| Indiana | Iowa State | 10 | 10 | 0 | 20 |
| Kentucky | Berkeley B | 0 | 0 | 0 | 0 |
| Maryland | Truman State | 0 | 0 | 0 | 0 |
| Minnesota A | McGill | 0 | 10 | 0 | 10 |
| WUSTL A | Minnesota B | 10 | 10 | 10 | 30 |
| North Carolina B | Toronto B | 0 | 10 | 0 | 10 |
| Yale B | Northwestern | 0 | 10 | 0 | 10 |
| Stanford | Purdue | 10 | 10 | 10 | 30 |
| Rutgers | NYU | 0 | 10 | 0 | 10 |
| Vanderbilt | Penn | 0 | 0 | 0 | 0 |
| Virginia | Toronto A | 0 | 10 | 0 | 10 |
| Texas | WUSTL B | 0 | 10 | 0 | 10 |
| South Carolina | Yale A | 0 | 0 | 0 | 0 |