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CH ENGR 109 · Lec 1

Numerical and Mathematical Methods in Chemical and Biological Engineering

Fall 2026Christofides, P.D.4 units

Seats, time, final and grades

Seats

Closed.

103 of 103 enrolled, lecture and all discussions summed.

Meets

MW 12:00pm-1:50pm

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

Final

Tue 8 Dec, 6:30pm to 9:30pm

One exam for the whole class, Los Angeles time.

Read 3 days ago.

Grades

3.59
predicted, this instructor · 380 grades

380 letter grades, Christofides, P.D..

Read 30 minutes ago. This is a recent reading, not a live seat count.

dibs has seen this section open 11 times since 17 August. The last time was 1 September. 4 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 3 days ago: "Undergraduate Chemical Engineering Majors".

Tell dibs what you have already taken and this line will say which of these you have. Your list.

From the registrar

Students who enroll in upper-division courses offered by the Samueli School without completing the requisites are subject to disenrollment after the second class meeting. If necessary, consult with an OASA counselor through MyUCLA Message Center.

Restrictions read 3 days ago. dibs re-reads these slowly because they rarely change; watch the section and it moves to every 6 hours.

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.

3 discussions, none open. There is no waitlist either, so the only way in is somebody dropping the lecture.

No discussion is open. Whatever the lecture reads, there is currently nothing here to enroll in.
  • Dis 1A

    F 3:00pm-3:50pm

    Lin, C., Cui, X., and Wang, Y.

    Closed.

  • Dis 1B

    F 3:00pm-3:50pm

    Lin, C., Cui, X., and Wang, Y.

    Closed.

  • Dis 1C

    F 9:00am-9:50am

    Lin, C., Cui, X., and Wang, Y.

    Closed.

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: MW 12:00pm-1:50pm

Boelter Hall 2760

Grades

3.59
predicted, this instructor · 380 grades
A range
69%
P/NP
-
letter grade only
D/F/W
0.8%

Full grade history for CH ENGR 109

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. 2.3 of 5 for Panagiotis Christofides, where 5 is lightest. Read 29 days ago.

dibs has not read this course’s reviews, so it cannot say what kind of work it sets. That is dibs not having looked. It is not a course without papers or exams, and the reviews linked below are the answer until dibs catches up.

CH ENGR 109 reviews for Panagiotis Christofides Reviews for all professors of CH ENGR 109

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.

  • 6721F
  • 6422F
  • 8123F
  • 7624F
  • 9225F
Enrollment by term: 21F 67, 22F 64, 23F 81, 24F 76, 25F 92

Peak 92 · most recent 25F at 92

Seats over time

Filled by 12 over about 2 months

11 times reopened
103 of 103 · no seats left in its discussions
17 Aug 15:079 Sep 07:091 Oct 23:12
dibs read 168 of the 691 hours its hourly record covers, 24%, and did not look in 523. dibs had no hourly record before 3 Sep, which is the other 398 of 1089 plotted.103 of 103 enrolled at the newest reading, 30 minutes ago, and no seats left in its discussions. Seats from 17 Aug 15:07 to 1 Oct 23:12, 91 to 103. dibs read 168 of the 691 hours its hourly record here covers, 24%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 523 hours dibs was keeping a record and did not reach this section. Nothing before 3 September at 05:00, where this section's record starts, has a read either way, which is 398 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: 30 minutes ago.

Show the readings (29)
Recorded Enrolled Capacity Status Waitlist Hours read
1 Oct 23:12 103 103 closed - 67 of 242
21 Sep 22:12 103 103 closed - 102 of 456, 6 no hourly record
2 Sep 23:40 102 103 open - no hourly record
2 Sep 21:40 98 99 open - no hourly record
2 Sep 09:40 98 103 open - no hourly record
1 Sep 20:40 98 99 open - no hourly record
1 Sep 19:40 99 99 closed - no hourly record
1 Sep 17:40 98 99 open - no hourly record
1 Sep 14:40 99 99 closed - no hourly record
1 Sep 13:40 98 99 open - no hourly record
1 Sep 12:40 99 99 closed - no hourly record
1 Sep 10:40 98 99 open - no hourly record
1 Sep 07:40 99 99 closed - no hourly record
1 Sep 06:40 98 99 open - no hourly record
1 Sep 02:40 99 99 closed - no hourly record
31 Aug 21:40 97 97 closed - no hourly record
31 Aug 19:40 97 99 open - no hourly record
31 Aug 13:40 97 97 closed - no hourly record
31 Aug 12:40 97 99 open - no hourly record
28 Aug 00:40 97 97 closed - no hourly record
27 Aug 22:40 95 97 open - no hourly record
27 Aug 21:40 97 97 closed - no hourly record
27 Aug 20:40 95 97 open - no hourly record
27 Aug 19:40 97 97 closed - no hourly record
27 Aug 10:40 95 97 open - no hourly record
21 Aug 17:40 95 95 closed - no hourly record
20 Aug 14:40 94 95 open - no hourly record
18 Aug 04:30 94 94 closed - no hourly record
17 Aug 15:07 91 94 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.

Class chat

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