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CHEM 20AH · Lec 1

Chemical Structure (Honors)

Fall 2026Narang, P.4 units

Seats, time, final and grades

Seats

Open, 2 seats left.

48 of 50 enrolled, lecture and all discussions summed.

Meets

MWF 12:00pm-12:50pm

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

Final

Thu 10 Dec, 3:00pm to 6:00pm

One exam for the whole class, Los Angeles time.

Read 3 hours ago.

Grades

3.84
predicted, this instructor · 41 grades

41 letter grades, Narang, P..

Read 44 minutes ago. This is a recent reading, not a live seat count.

dibs has seen this section open 15 times since 17 August. The last time was 28 September. 5 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

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.

2 discussions, all open.

  • Dis 1A

    T 12:00pm-12:50pm

    Nie, S. and Diab, J.

    Open, 1 seat left.

  • Dis 1B

    R 12:00pm-12:50pm

    Nie, S. and Diab, J.

    Open, 1 seat left.

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 12:00pm-12:50pm

Discussions: T 12:00pm-12:50pm · R 12:00pm-12:50pm

Young Hall 4216

Grades

3.84
predicted, this instructor · 41 grades

Of the 3 other people in the grade record for CHEM 20AH, the 2 with the most grades: GELBART, WILLIAM M at 3.63 over 82 grades and ALEXANDROVA, ANASTASSIA N at 3.71 over 37 grades.

A range
88%
P/NP
0%
D/F/W
0.0%

Full grade history for CHEM 20AH

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.

Workload, heavy. 2.0 of 5 for Prineha Narang, where 5 is lightest. Read 30 days ago.

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 106 reviews about 1 month ago. That is the reviewers being silent, and not a course that sets no work.

CHEM 20AH reviews for Prineha Narang Reviews for all professors of CHEM 20AH

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.

  • 4421F
  • 3822F
  • 3123F
  • 4124F
  • 3825F
Enrollment by term: 21F 44, 22F 38, 23F 31, 24F 41, 25F 38

Peak 44 · most recent 25F at 38

Seats over time

Filled by 18 over about 2 months

15 times reopened
48 of 50 · 2 left in its discussions
17 Aug 12:329 Sep 02:261 Oct 16:20
dibs read 168 of the 176 hours its hourly record covers, 95%, and did not look in 8. dibs had no hourly record before 24 Sep, which is the other 909 of 1085 plotted.48 of 50 enrolled at the newest reading, 44 minutes ago, with 2 left in its discussions. Seats from 17 Aug 12:32 to 1 Oct 16:20, 30 to 48. dibs read 168 of the 176 hours its hourly record here covers, 95%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 8 hours dibs was keeping a record and did not reach this section. Nothing before 24 September at 09:00, where this section's record starts, has a read either way, which is 909 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: 44 minutes ago.

Show the readings (131)
Recorded Enrolled Capacity Status Waitlist Hours read
1 Oct 16:20 48 50 open 0 of 4 39 of 40
30 Sep 01:20 48 50 open 0 of 4 2 of 2
30 Sep 00:02 49 50 open 0 of 4 6 of 7
29 Sep 18:20 48 50 open 0 of 4 2 of 2
29 Sep 17:02 49 50 open 0 of 4 3 of 4
29 Sep 14:50 48 50 open 0 of 4 2 of 2
29 Sep 13:32 49 50 open 0 of 4 2 of 2
29 Sep 12:20 48 50 open 0 of 4 2 of 3
29 Sep 10:10 49 50 open 0 of 4 2 of 2
29 Sep 09:00 48 50 open 0 of 4 19 of 21
28 Sep 13:00 49 50 open 0 of 4 3 of 3
28 Sep 11:32 50 50 waitlist 0 of 4 2 of 2
28 Sep 10:50 49 50 open 0 of 4 10 of 10
28 Sep 01:00 50 50 waitlist 0 of 4 6 of 6
27 Sep 20:30 50 50 waitlist 1 of 4 2 of 2
27 Sep 19:40 49 50 open 1 of 4 7 of 7
27 Sep 13:50 50 50 waitlist 1 of 4 2 of 2
27 Sep 12:50 49 50 open 1 of 4 1 of 1
27 Sep 12:12 50 50 waitlist 1 of 4 13 of 13
27 Sep 00:30 49 50 open 1 of 4 2 of 2
26 Sep 23:30 48 50 open 1 of 4 3 of 3
26 Sep 21:42 49 50 open 1 of 4 2 of 2
26 Sep 20:50 48 50 open 1 of 4 2 of 2
26 Sep 19:50 49 50 open 1 of 4 1 of 1
26 Sep 19:00 48 50 open 1 of 4 3 of 3
26 Sep 17:30 49 50 open 1 of 4 3 of 3
26 Sep 15:50 48 50 open 1 of 4 2 of 2
26 Sep 14:42 49 50 open 1 of 4 1 of 1
26 Sep 14:20 48 50 open 1 of 4 5 of 5
26 Sep 10:40 49 50 open 1 of 4 2 of 2
26 Sep 09:00 48 50 open 1 of 4 3 of 3
26 Sep 07:30 49 50 open 1 of 4 8 of 8
26 Sep 00:30 48 50 open 1 of 4 4 of 4
25 Sep 21:42 49 50 open 1 of 4 1 of 1
25 Sep 21:00 50 50 waitlist 1 of 4 4 of 4
25 Sep 18:12 49 50 open 1 of 4 2 of 2
25 Sep 17:30 48 50 open 1 of 4 2 of 2
25 Sep 16:20 50 50 waitlist 1 of 4 2 of 2
25 Sep 15:30 48 50 open 1 of 4 2 of 2
25 Sep 14:42 50 50 waitlist 1 of 4 1 of 1
25 Sep 14:40 49 50 open 1 of 4 1 of 1
25 Sep 14:00 48 50 open 1 of 4 2 of 3
25 Sep 12:50 50 50 waitlist 1 of 4 2 of 2
25 Sep 11:12 49 50 open 1 of 4 19 of 20
24 Sep 16:30 50 50 waitlist 1 of 4 2 of 2
24 Sep 15:30 50 50 waitlist 2 of 4 3 of 3
24 Sep 13:10 50 50 waitlist 1 of 4 5 of 61, 56 no hourly record
22 Sep 01:10 50 50 waitlist 2 of 4 no hourly record
20 Sep 01:50 50 50 waitlist 3 of 4 no hourly record
19 Sep 00:32 50 50 closed 4 of 4 no hourly record
16 Sep 01:00 50 50 waitlist 3 of 4 no hourly record
16 Sep 00:00 50 50 waitlist 0 of 4 no hourly record
15 Sep 23:12 50 50 waitlist 2 of 4 no hourly record
15 Sep 22:40 50 50 waitlist 0 of 4 no hourly record
15 Sep 22:32 50 50 waitlist 2 of 4 no hourly record
15 Sep 20:30 50 50 waitlist 0 of 4 no hourly record
15 Sep 19:42 50 50 waitlist 2 of 4 no hourly record
15 Sep 19:10 50 50 waitlist 0 of 4 no hourly record
15 Sep 18:32 50 50 waitlist 2 of 4 no hourly record
15 Sep 15:40 50 50 waitlist 0 of 4 no hourly record
15 Sep 15:02 49 50 open 0 of 4 no hourly record
15 Sep 09:30 45 50 open 0 of 4 no hourly record
15 Sep 08:50 45 50 open - no hourly record
15 Sep 07:42 45 50 open 0 of 4 no hourly record
12 Sep 01:00 45 50 open - no hourly record
11 Sep 23:00 42 50 open - no hourly record
11 Sep 22:00 45 50 open - no hourly record
11 Sep 21:10 42 50 open - no hourly record
11 Sep 20:40 45 50 open - no hourly record
11 Sep 19:26 42 50 open - no hourly record
11 Sep 18:40 45 50 open - no hourly record
11 Sep 00:10 42 50 open - no hourly record
10 Sep 23:40 42 46 open - no hourly record
10 Sep 17:10 42 50 open - no hourly record
10 Sep 16:40 42 46 open - no hourly record
10 Sep 14:40 42 50 open - no hourly record
10 Sep 14:00 42 46 open - no hourly record
10 Sep 13:00 42 50 open - no hourly record
10 Sep 12:40 42 46 open - no hourly record
10 Sep 12:30 42 50 open - no hourly record
10 Sep 01:20 42 46 open - no hourly record
10 Sep 00:40 39 46 open - no hourly record
10 Sep 00:10 42 46 open - no hourly record
9 Sep 23:40 39 46 open - no hourly record
9 Sep 23:00 42 46 open - no hourly record
9 Sep 22:40 39 46 open - no hourly record
9 Sep 22:20 42 46 open - no hourly record
9 Sep 21:42 39 46 open - no hourly record
9 Sep 20:00 42 46 open - no hourly record
9 Sep 19:30 39 46 open - no hourly record
9 Sep 18:30 42 46 open - no hourly record
9 Sep 01:00 39 46 open - no hourly record
9 Sep 00:40 39 42 open - no hourly record
8 Sep 22:40 39 46 open - no hourly record
8 Sep 21:00 39 42 open - no hourly record
8 Sep 20:00 39 46 open - no hourly record
8 Sep 18:40 39 42 open - no hourly record
8 Sep 17:40 39 46 open - no hourly record
5 Sep 01:30 39 42 open - no hourly record
4 Sep 00:40 37 42 open - no hourly record
4 Sep 00:10 37 38 open - no hourly record
3 Sep 23:40 37 42 open - no hourly record
3 Sep 22:50 37 38 open - no hourly record
3 Sep 22:10 37 42 open - no hourly record
3 Sep 21:40 37 38 open - no hourly record
3 Sep 17:40 37 42 open - no hourly record
3 Sep 17:20 37 38 open - no hourly record
3 Sep 16:30 37 42 open - no hourly record
3 Sep 15:50 37 38 open - no hourly record
3 Sep 14:40 37 42 open - no hourly record
3 Sep 14:10 37 38 open - no hourly record
3 Sep 11:27 37 42 open - no hourly record
26 Aug 00:40 37 38 open - no hourly record
25 Aug 23:40 34 38 open - no hourly record
25 Aug 22:40 37 38 open - no hourly record
25 Aug 21:55 34 38 open - no hourly record
25 Aug 20:55 37 38 open - no hourly record
25 Aug 19:55 34 38 open - no hourly record
25 Aug 19:40 37 38 open - no hourly record
24 Aug 16:55 34 38 open - no hourly record
24 Aug 13:55 34 34 closed - no hourly record
24 Aug 12:55 34 38 open - no hourly record
20 Aug 21:55 34 34 closed - no hourly record
20 Aug 20:55 30 34 open - no hourly record
20 Aug 17:55 34 34 closed - no hourly record
20 Aug 00:55 30 34 open - no hourly record
19 Aug 23:55 30 30 closed - no hourly record
19 Aug 19:55 30 34 open - no hourly record
19 Aug 18:55 30 30 closed - no hourly record
19 Aug 15:55 30 34 open - no hourly record
17 Aug 12:32 30 30 closed - -
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.

Class chat

One dibs reader watches this class or has it on a plan. Nobody has posted yet.

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