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CHEM 20A · Lec 1

Chemical Structure

Fall 2026Wilson, P.4 units

Seats, time, final and grades

Seats

Waitlist, 6 of 12 places taken.

350 of 350 enrolled, lecture and all discussions summed.

Meets

MWF 8:00am-8:50am

Lecture only. You also attend a discussion, listed below.

Final

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

One exam for the whole class, Los Angeles time.

Read 3 hours ago.

Grades

3.51
predicted, all instructors · 4,457 grades

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

Read 90 minutes ago. This is a recent reading, not a live seat count.

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

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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

From the registrar limited early, then open

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.

The limit stands until 15 September, and lifts then. dibs still counts this class as one you can take, but not yet.

Restrictions read 3 hours ago.

Discussions

You enroll in the discussion, not the lecture, so the seat figure above is the sum across all of them and can read open while every discussion you could actually join is full.

6 discussions, none open. The way in is the lecture's waitlist, at 6 of 12.

No discussion is open. 5 discussions have a waitlist with room. A place on one is not a seat: it is a queue the department may or may not clear.
  • Dis 1A

    M 1:00pm-1:50pm

    Han, K.

    Closed.

  • Dis 1B

    M 3:00pm-3:50pm

    Gani, G.

    Waitlist, 1 of 2 places taken.

  • Dis 1C

    W 2:00pm-2:50pm

    Wang, Z.

    Waitlist, 1 of 2 places taken.

  • Dis 1D

    W 4:00pm-4:50pm

    Williams, J.Q.

    Waitlist, 1 of 2 places taken.

  • Dis 1E

    R 10:00am-10:50am

    Gani, G.

    Waitlist, 1 of 2 places taken.

  • Dis 1F

    R 1:00pm-1:50pm

    Williams, J.Q.

    Waitlist, 0 of 2 places taken.

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: MWF 8:00am-8:50am

Young Hall CS50

Grades

3.51
predicted, all instructors · 4,457 grades

Of the 6 people in the grade record for CHEM 20A, the 2 with the most grades: 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
  • Quizzes mentioned, no number given, said by 3 reviewers
  • Papers mentioned, no number given, said by 1 reviewer
  • Problem sets mentioned, no number given, said by 5 reviewers
  • Presentations mentioned, no number given, said by 1 reviewer

Read from 336 reviews about 1 month 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 Search the reviews for P. Wilson

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

Seats over time

Filled by 130 over about 2 months

2 times reopened
350 of 350 · no seats left in its discussions
17 Aug 12:329 Sep 02:031 Oct 15:34
dibs read 168 of the 507 hours its hourly record covers, 33%, and did not look in 339. dibs had no hourly record before 10 Sep, which is the other 577 of 1084 plotted.350 of 350 enrolled at the newest reading, 90 minutes ago, and no seats left in its discussions. Seats from 17 Aug 12:32 to 1 Oct 15:34, 220 to 350. dibs read 168 of the 507 hours its hourly record here covers, 33%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 339 hours dibs was keeping a record and did not reach this section. Nothing before 10 September at 13:00, where this section's record starts, has a read either way, which is 577 hours of this window. Where the drawing is faint or broken, that 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 joins recorded counts; changes between reads may be missed. 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: 90 minutes ago.

Show the readings (83)
Recorded Enrolled Capacity Status Waitlist Hours read
1 Oct 15:34 350 350 waitlist 6 of 12 6 of 16
1 Oct 00:22 350 350 waitlist 6 of 12 7 of 21
30 Sep 04:12 350 350 waitlist 7 of 12 2 of 5
30 Sep 00:02 350 350 waitlist 6 of 12 2 of 5
29 Sep 20:32 350 350 waitlist 7 of 12 6 of 16
29 Sep 05:02 350 350 waitlist 6 of 12 4 of 12
28 Sep 18:32 350 350 waitlist 5 of 12 2 of 4
28 Sep 15:02 350 350 waitlist 4 of 12 5 of 15
28 Sep 01:02 350 350 waitlist 7 of 12 2 of 5
27 Sep 21:32 350 350 waitlist 9 of 12 2 of 4
27 Sep 18:12 350 350 waitlist 10 of 12 2 of 4
27 Sep 15:02 350 350 waitlist 9 of 12 2 of 4
27 Sep 12:12 350 350 waitlist 10 of 12 5 of 16
26 Sep 21:42 350 350 waitlist 11 of 12 2 of 4
26 Sep 18:12 350 350 waitlist 10 of 12 2 of 5
26 Sep 14:42 350 350 waitlist 11 of 12 5 of 14
26 Sep 01:12 350 350 waitlist 10 of 12 8 of 26
25 Sep 00:22 350 350 closed 12 of 12 2 of 5
24 Sep 20:52 350 350 waitlist 11 of 12 2 of 3
24 Sep 18:12 350 350 closed 12 of 12 2 of 5
24 Sep 14:42 350 350 waitlist 11 of 12 4 of 11
24 Sep 04:12 350 350 closed 12 of 12 2 of 6
23 Sep 23:42 350 350 waitlist 10 of 12 2 of 4
23 Sep 20:32 350 350 waitlist 11 of 12 2 of 5
23 Sep 16:42 350 350 waitlist 10 of 12 3 of 7
23 Sep 10:22 350 350 waitlist 11 of 12 6 of 18
22 Sep 17:52 350 350 closed 12 of 12 6 of 17
22 Sep 01:12 350 350 waitlist 11 of 12 2 of 5
21 Sep 21:42 350 350 waitlist 10 of 12 4 of 8
21 Sep 14:42 350 350 closed 12 of 12 4 of 11
21 Sep 04:42 350 350 waitlist 10 of 12 2 of 4
21 Sep 01:02 350 350 waitlist 11 of 12 2 of 5
20 Sep 21:42 350 350 closed 12 of 12 2 of 3
20 Sep 19:22 350 350 waitlist 10 of 12 6 of 16
20 Sep 04:12 350 350 closed 12 of 12 11 of 31
18 Sep 22:02 350 350 waitlist 11 of 12 2 of 5
18 Sep 18:42 350 350 closed 12 of 12 2 of 3
18 Sep 16:12 350 350 waitlist 11 of 12 5 of 15
18 Sep 02:42 350 350 closed 12 of 12 6 of 13
17 Sep 14:42 350 350 waitlist 11 of 12 2 of 3
17 Sep 12:22 350 350 waitlist 10 of 12 3 of 7
17 Sep 06:32 350 350 waitlist 11 of 12 2 of 5
17 Sep 02:02 350 350 closed 12 of 12 2 of 5
16 Sep 22:32 350 350 waitlist 11 of 12 2 of 4
16 Sep 19:02 350 350 closed 12 of 12 2 of 5
16 Sep 15:52 350 350 waitlist 11 of 12 7 of 18
15 Sep 22:32 350 350 closed 12 of 12 3 of 5
15 Sep 18:32 350 350 waitlist 10 of 12 3 of 8
15 Sep 11:32 350 350 closed 12 of 12 2 of 5
15 Sep 07:42 345 350 open 0 of 12 25 of 79
12 Sep 01:22 345 350 open - 3 of 5
11 Sep 21:32 323 350 open - 2 of 2
11 Sep 20:52 345 350 open - 12 of 19
11 Sep 02:40 323 350 open - 2 of 4
10 Sep 23:40 324 327 open - 4 of 7
10 Sep 17:40 324 350 open - 2 of 2
10 Sep 16:40 324 327 open - 3 of 4
10 Sep 13:40 324 350 open - 1 of 13, 12 no hourly record
10 Sep 01:40 324 327 open - no hourly record
9 Sep 01:40 305 327 open - no hourly record
9 Sep 00:40 305 306 open - no hourly record
8 Sep 22:40 305 327 open - no hourly record
5 Sep 02:40 305 306 open - no hourly record
3 Sep 23:40 286 306 open - no hourly record
3 Sep 21:40 285 285 closed - no hourly record
3 Sep 11:27 286 306 open - no hourly record
2 Sep 01:40 285 285 closed - no hourly record
26 Aug 00:40 283 285 open - no hourly record
25 Aug 23:40 249 283 open - no hourly record
25 Aug 22:40 283 285 open - no hourly record
25 Aug 21:55 249 283 open - no hourly record
25 Aug 20:55 283 285 open - no hourly record
25 Aug 19:55 249 283 open - no hourly record
25 Aug 19:40 283 285 open - no hourly record
24 Aug 16:55 249 283 open - no hourly record
24 Aug 13:55 249 261 open - no hourly record
24 Aug 12:55 249 283 open - no hourly record
20 Aug 17:55 249 261 open - no hourly record
19 Aug 14:55 221 251 open - no hourly record
19 Aug 12:55 221 227 open - no hourly record
19 Aug 10:55 221 251 open - no hourly record
19 Aug 01:55 221 227 open - no hourly record
17 Aug 12:32 220 227 open - -
How readings and alerts work

A reading and an hourly record are different things, and most charts here hold more of the second missing than present. dibs has taken readings of a section since long before it began keeping an hour-by-hour log of when it looked, so the empty stretches are dibs saying it was not keeping that log yet, not that it looked and found nothing. That is the age of the record and not a fault.

Seat counts show the last successful read, not live availability. Refreshes can be delayed by request limits or upstream interruptions. Watched sections receive priority, but an hourly update for every section is not guaranteed.

The registrar can change a seat count between our checks. Alerts depend on dibs detecting an opening and completing delivery; a quiet watch does not prove that no seat opened. Check the registrar before enrolling.

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