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You are looking at Winter 2027. Enrollment for it has not opened, so these are the registrar's early listings. dibs holds 1,951 sections for Winter 2027, read 4 days ago. Separately, it has finished 986 of the 3,481 courses on its own sweep list for this term. Terms nobody is enrolling in are swept one a night in rotation, so a course with nothing here may simply not have been reached yet. Back to Fall 2026

CHEM 20A

Chemical Structure

4 units Physical Sciences

Lecture and discussion.

Winter 2027: 2 lectures and 8 discussions. Nothing here is open. The oldest of these readings was 6 days ago.

Grades

3.51

Average grade awarded in CHEM 20A. Not a student rating: this is what the grades were.

In the A range

69%

of the 4,457 letter grades

D, F or W

2.9%

of every letter grade awarded, plus withdrawals

Taken pass/no pass

<1%

9 of 15 students passed

The registrar's own records: 4,457 grades over 12 terms, Fall 2021 to Fall 2025. 3 of those terms are summer sessions, and summer sessions are counted here. Every instructor is pooled here. The table below splits them, and term averages across those 12 terms ran 3.08 to 3.85.

  • A+ 1,001 · 22.5%
  • A 1,423 · 31.9%
  • A- 654 · 14.7%
  • B+ 375 · 8.4%
  • B 324 · 7.3%
  • B- 191 · 4.3%
  • C+ 166 · 3.7%
  • C 109 · 2.4%
  • C- 84 · 1.9%
  • D+ 12 · 0.3%
  • D 26 · 0.6%
  • D- 7 · 0.2%
  • F 85 · 1.9%
  • P 9 of 4,498
  • NP 6 of 4,498
  • I 26 of 4,498

Percentages are of the 4,457 letter grades. Grey bars are non-letter outcomes: passes (P), no-passes (NP), and incompletes (I). They are excluded from the GPA entirely rather than scored, because counting a P as a 4.0 would be a fabrication.

By instructor

Predicted GPA, raw average, sample size, terms, A range and the workload reviewers reported for every instructor with a grade record in this course
Instructor Predicted GPA Raw n Terms A range Workload Winter 2027
KAVNER, ABBY reviews ↗ 3.70 3.71 1,625 3 81% light not teaching it
SHAO, HUILING reviews ↗ 3.54 3.54 1,031 3 68% light not teaching it
WU, ERIC C reviews ↗ 3.37 3.37 784 1 64% - not teaching it
DEIFEL, NICHOLAS reviews ↗ 3.65 3.65 350 2 83% very light not teaching it
OW, FRANKLIN P reviews ↗ 3.28 3.26 336 3 53% very light not teaching it
SCERRI, ERIC ROBERT reviews ↗ 2.88 2.85 331 1 28% average not teaching it

“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.

dibs measures outcomes: grades, seats, how fast a class fills. For what a class is like to sit in, BruinWalk has the reviews.

Reviews for CHEM 20A

What comes first

dibs has not read a class page for CHEM 20A, so it cannot say what comes before it.

Counted in courses rather than quarters: dibs does not know which of them a department lets you take together.

In Winters

Ran in 4 of the last 4 Winters.

From the terms dibs holds, which start in Fall 2021 and exclude summer. A department can run a course in a quarter it never has before.

From the registrar's catalog

Lecture, three hours; discussion, one hour. Preparation: high school chemistry or equivalent background and three and one half years of high school mathematics. Recommended preparation: high school physics. Requisite: completion of Chemistry Diagnostic Test. Enforced corequisite: Mathematics 31A. Not open to students with credit for course 14A. First term of general chemistry. Survey of chemical processes, quantum chemistry, atomic and molecular structure and bonding, molecular spectroscopy. P/NP or letter grading.

Sections in Winter 2027

You enroll in the discussion, not the lecture, so a discussion's status is the one that decides whether you get in. A lecture can read open while every discussion under it is full.

Seat counts as of : the oldest of these 10 readings. The registrar publishes hourly and dibs reads what it can each hour, so a row can be older than that.

Final enrollment, averaged across each term's sections: between 214 and 392 a term over 9 terms, summer excluded, most recently 392 in Fall 2025. That is the shape across years, not this term, which is above.

Seats over time in Winter 2027

Read once so far, so there is no line to draw yet. A second reading is what turns this into a chart: courses come round within about three hours, and anything you watch every hour.