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CHEM 20A · Dis 1C

Chemical Structure

Fall 2026An unnamed TA4 units

Seats, time, final and grades

Seats

Open, 3 seats left.

49 of 52 enrolled.

Meets

W 2:00pm-2:50pm

This discussion only. You also attend Lec 1.

Final

Mon 7 Dec, 3:00pm to 6:00pm

One exam for the whole class, Los Angeles time.

Read 14 hours ago.

Grades

3.51
course average · 4,457 grades

4,457 letter grades, everyone who has taught CHEM 20A.

Read 5 hours ago. dibs reads this about once an hour, so the seats and the instructors here may both have moved since.

dibs has seen this section open 13 times since 17 August. The last time was about 5 hours ago. 7 of those were readings where the capacity figure moved and the enrolled count did not, so dibs could not tell whether a seat existed and did not send an alert.

Enroll on the registrar (opens in a new tab) Sign in to watch for an opening

Watching is the one thing here that needs an account, because an alert needs somewhere to go. Everything else on this page works signed out.

Put this class on a board

A board is one quarter you are drafting, so it needs an account to live in. Signing in brings you straight back to this page, with this class still in front of you.

Before you can enroll

Registrar's Restrictions cell, read 36 hours ago: "New Students Only".

From the registrar new students only until 15 September

Any student attempting to save or sell a spot for another student is violating Student Conduct Code 102.23d and may be referred to the Office of the Dean of Students. Seats are held for entering students who enroll through New Student Orientation sessions beginning July 2, 2026. New student restrictions will be lifted on September 15, 2026 at 8 a.m. PTE numbers are NOT available; do not contact the instructor for a PTE number.

Held for entering students enrolling through orientation until 15 September. If that is you, the seats are yours now; if not, the class opens to you that morning.

Restrictions read 36 hours ago. dibs re-reads these slowly because they rarely change; watch the section and it moves to every 6 hours.

When it meets

Mon
Tue
Wed
Thu
Fri
6am
7am
8am
9am
10am
11am
12pm
1pm
2pm
3pm
4pm
5pm
6pm
7pm
8pm
9pm
10pm

Meets: W 2:00pm-2:50pm

Lecture: MWF 8:00am-8:50am

Young Hall 2200

Grades

3.51
course average · 4,457 grades

2 other people have taught CHEM 20A in the grade record: KAVNER, ABBY at 3.70 over 1,625 grades and SHAO, HUILING at 3.54 over 1,031 grades.

A range
69%
P/NP
<1%
D/F/W
2.9%

Full grade history for CHEM 20A

What students say

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

What the work looks like

  • Exams mentioned, no number given, said by 11 reviewers “At the beginning of the quarter, she told us that we'd be focusing on quantum mechanics and that it'd be an important topic, just to not have any questions on the final covering that topic.”
  • Quizzes mentioned, no number given, said by 3 reviewers “There were 3 quizzes, one question each.”
  • Papers mentioned, no number given, said by 1 reviewer “a final paper, which sounds like a lot (12-15 pages)”
  • Problem sets mentioned, no number given, said by 5 reviewers “do the problem sets each week”
  • Presentations mentioned, no number given, said by 1 reviewer “There're also two presentations that were really chill and a final paper”

Read from 336 reviews 3 days ago. dibs counts only what a review actually states, so a kind of work nobody mentioned is absent rather than zero.

Reviews for CHEM 20A

Will it still be here

high risk chance of closing before your enrollment pass.

Final enrollment per term from four years of grade data. Summer excluded: different population, different pass structure.

  • 29521F
  • 23122W
  • 30422F
  • 21423W
  • 29223F
  • 22924W
  • 35124F
  • 24525W
  • 39225F
Enrollment by term: 21F 295, 22W 231, 22F 304, 23W 214, 23F 292, 24W 229, 24F 351, 25W 245, 25F 392

Peak 392 · most recent 25F at 392

Filled by 11 over 17 days

13 times reopened
49 of 52
17 Aug 16:423 Sep 11:29
read 168hnot reached 31hno record 205hSeats from 17 Aug 16:42 to 3 Sep 11:29, 38 to 49. Across the 404 hours from 17 Aug 16:42 to 3 Sep 11:29, dibs holds a read record for 168 of them. Where the line is flat across an hour dibs did read, the count held: that is checked and unchanged, rather than nobody having looked. For 31 hours dibs was keeping a record and did not reach this section. Nothing before 26 August at 05:00, where this section's record starts, has a read either way, which is 205 hours of this window. A hedged line never means the readings are doubtful. It means the stretch between them is unaccounted for.

A dot is a reading where something moved: the seat count, the status, or the waitlist. Flat between dots means it did not drift, it held and then jumped, and the line starts when dibs first saw this section rather than reaching back before it existed. The last one is the last time dibs read this section, moved or not, and that was 5 hours ago. It is where the line stops, not where the count is now.

Across the 404 hours from 17 Aug 16:42 to 3 Sep 11:29, dibs holds a read record for 168 of them. Where the line is flat across an hour dibs did read, the count held: that is checked and unchanged, rather than nobody having looked. For 31 hours dibs was keeping a record and did not reach this section. Nothing before 26 August at 05:00, where this section's record starts, has a read either way, which is 205 hours of this window. A hedged line never means the readings are doubtful. It means the stretch between them is unaccounted for.

Show the readings (27)
Recorded Enrolled Capacity Status Waitlist Hours read
3 Sep 11:29 49 52 open - 1 of 1
3 Sep 11:27 49 52 open - 168 of 204, 5 no record
26 Aug 00:40 49 49 closed - no record
25 Aug 23:40 44 47 open - no record
25 Aug 22:40 49 49 closed - no record
25 Aug 21:55 44 47 open - no record
25 Aug 20:55 49 49 closed - no record
25 Aug 19:55 44 47 open - no record
25 Aug 19:40 49 49 closed - no record
24 Aug 19:55 44 47 open - no record
24 Aug 17:55 44 44 closed - no record
24 Aug 15:55 44 47 open - no record
24 Aug 14:55 44 44 closed - no record
24 Aug 12:55 44 47 open - no record
24 Aug 11:55 44 44 closed - no record
24 Aug 10:55 44 47 open - no record
20 Aug 23:55 44 44 closed - no record
20 Aug 22:55 38 42 open - no record
20 Aug 21:55 44 44 closed - no record
20 Aug 20:55 38 42 open - no record
20 Aug 19:55 44 44 closed - no record
20 Aug 18:55 38 42 open - no record
20 Aug 17:55 44 44 closed - no record
19 Aug 14:55 38 42 open - no record
19 Aug 13:55 38 38 closed - no record
19 Aug 12:55 38 42 open - no record
17 Aug 16:42 38 38 closed - -

Class chat

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