CHEM 20B
Chemical Energetics and Change
Grades
3.25
Average grade awarded in CHEM 20B. Not a student rating: this is what the grades were.
In the A range
52%
of the 2,706 letter grades
D, F or W
5.0%
of every letter grade awarded, plus withdrawals
Taken pass/no pass
<1%
8 of 12 students passed
The registrar's own records: 2,706 grades over 8 terms, Fall 2021 to Fall 2025. Every instructor is pooled here.
What is inside that record
No summer session is in that record.
The table below splits them, and term averages across those 8 terms ran 2.93 to 3.57.
Historical grades for all professors, across recorded terms. The course summary above includes all professors.
- A+ 459 · 17.0%
- A 649 · 24.0%
- A- 290 · 10.7%
- B+ 330 · 12.2%
- B 298 · 11.0%
- B- 168 · 6.2%
- C+ 145 · 5.4%
- C 144 · 5.3%
- C- 89 · 3.3%
- D+ 13 · 0.5%
- D 53 · 2.0%
- D- 9 · 0.3%
- F 59 · 2.2%
- P 8 of 2,740
- NP 4 of 2,740
- I 22 of 2,740
Percentages are of the 2,706 letter grades. Grey bars are non-letter outcomes: passes (P), no-passes (NP), and incompletes (I).
How the non-letter outcomes are counted
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 GPA | Raw | n | Terms | A range | Workload | Winter 2027 |
|---|---|---|---|---|---|---|---|
| BARR, KRISTOPHER KENT reviews ↗ | 3.21 | 3.21 | 1,245 | 4 | 46% | heavy | not teaching it |
| RESLAN, RANDA reviews ↗ | 3.05 | 3.04 | 689 | 2 | 45% | light | not teaching it |
| WU, ERIC C reviews ↗ | 3.57 | 3.57 | 647 | 1 | 71% | - | not teaching it |
| WEISS, PAUL S reviews ↗ | 3.10 | 3.08 | 125 | 1 | 42% | heavy | not teaching it |
Why Predicted is not the Raw average
“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.
Grade records describe outcomes. For what a course is like to take, read student reviews written on dibs below or follow the separate external review link.
Workload and assignments
Work types reported in BruinWalk reviews of this course, across recorded instructors and terms. They may differ from this term's syllabus.
dibs has read this course’s reviews and none of them say what kind of work it sets, so dibs has nothing to show rather than a guess. Read from 252 reviews 26 days ago. That is the reviewers being silent, and not a course that sets no work.
What comes first
dibs has not read a class page for CHEM 20B in any term it holds, 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. Enforced requisites: course 14A or 14AE or 20A or 20AH, and Mathematics 31A, with grades of C- or better. Enforced corequisite: Mathematics 31B. Second term of general chemistry. Intermolecular forces and organization, phase behavior, chemical thermodynamics, solutions, equilibria, reaction rates and laws. P/NP or letter grading.
Sections in Winter 2027
From the people who took it
Student reviews
What taking CHEM 20B was like: the work, the teaching, and what students wish they’d known.
Your experience could be the first.
No student reviews are available to read on dibs for this course yet. Took it? Tell the next person what helped, what was hard, and how you spent your time.
Looking for more perspectives?
External reviews are separate and do not count toward the dibs rating.