CHEM 20L
General Chemistry Laboratory
Lecture, one hour; laboratory, three hours. Enforced requisite: course 14A or 20A with grade of C- or better. Enforced corequisite: course 14B or 20B. Use of balance, volumetric techniques, volumetric and potentiometric analysis; Beer's law, applications for environmental analysis and materials science. P/NP or letter grading.
Course statistics
- Predicted GPA
- 3.49
- n = 2,680 · 8 terms · ± 0.011
- A range
- 59%
- of letter grades
- Taken P/NP
- 0%
- 0% of those passed
- D / F / W
- 0.6%
- incl. withdrawals
Sections in Fall 2026
Enrollment history
Final enrollment per term, averaged across that term's sections. Four years deep, summer excluded. Per-section live curves are on each section page.
- 23522W
- 19822S
- 23623W
- 19723S
- 23224W
- 19424S
- 23225W
- 22725S
Grade distribution
- A+ 1 · 0.0%
- A 1,432 · 53.3%
- A- 160 · 6.0%
- B+ 124 · 4.6%
- B 664 · 24.7%
- B- 57 · 2.1%
- C+ 45 · 1.7%
- C 171 · 6.4%
- C- 10 · 0.4%
- D+ 1 · 0.0%
- D 10 · 0.4%
- D- 1 · 0.0%
- F 4 · 0.1%
- NP 1 · 0.0%
- I 6 · 0.2%
Grey bars are non-letter outcomes — P/NP, S/U, incompletes. They are excluded from the GPA entirely rather than scored, because counting a P as a 4.0 would be a fabrication.
By instructor
| Instructor | Predicted | Raw | n | Terms | A range |
|---|---|---|---|---|---|
| PANG, JOHNNY | 3.49 | 3.49 | 1,626 | 4 | 59% |
| PANG, JOHNNY W | 3.52 | 3.52 | 467 | 1 | 63% |
| RUSSELL, A A | 3.45 | 3.45 | 390 | 2 | 55% |
| HENARY, MAHER M | 3.52 | 3.52 | 197 | 1 | 61% |
| ANDERSON, MACKENZIE BABETTA | 3.28 | 3.26 | 193 | 1 | 40% |
“Predicted” is shrunk toward the course average, which is itself shrunk toward the department — so an instructor with a handful of students sits near the course mean rather than topping the list.
By term
- 22W 3.52 n=467
- 22S 3.52 n=197
- 23W 3.54 n=471
- 23S 3.62 n=197
- 24W 3.62 n=464
- 24S 3.26 n=193
- 25W 3.42 n=464
- 25S 3.26 n=227