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CH ENGR 109 · Dis 1C

Numerical and Mathematical Methods in Chemical and Biological Engineering

Fall 2026Lin, C., Cui, X., and Wang, Y.4 units

Seats, time, final and grades

Seats

Closed.

34 of 34 enrolled.

Its lecture reads closed (103 of 103 enrolled): you attend both, so this seat is not one you can take while that holds. There is no waitlist either, so the only way in is somebody dropping the lecture.

Meets

F 9:00am-9:50am

This discussion only. You also attend Lec 1.

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, all instructors · 380 grades

380 letter grades, everyone who has taught CH ENGR 109.

Read 6 hours ago. The latest refresh is overdue. Seats and instructors may have changed since. Check the registrar before enrolling.

dibs has seen this section open 3 times since 18 August. The last time was 2 September. 3 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.

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Before you can enroll

Registrar's Restrictions cell, read 14 days ago: "Undergraduate School of 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 14 days 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
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9pm
10pm

Meets: F 9:00am-9:50am

Lecture: MW 12:00pm-1:50pm

Dodd Hall 78

Grades

3.59
predicted, all instructors · 380 grades

1 person has taught CH ENGR 109 in the grade record: CHRISTOFIDES, PANAGIOTIS D at 3.59 over 380 grades.

A range
69%
P/NP
0%
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.

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.

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

Nothing read since 1 Oct, 6 hours ago. Over about 1 month before that, filled by 4.

3 times reopened
34 of 34 · no seats left
18 Aug 04:309 Sep 10:211 Oct 16:12 · 6 hours ago
dibs read 160 of the 904 hours its hourly record covers, 18%, and did not look in 744. dibs had no hourly record before 25 Aug, which is the other 165 of 1069 plotted.34 of 34 enrolled at the newest reading, 6 hours ago, and no seats left. Seats from 18 Aug 04:30 to 1 Oct 16:12, 30 to 34. dibs read 160 of the 904 hours its hourly record here covers, 18%. An hour marked as read confirms a check, not continuous monitoring. That check recorded no change; changes between checks may be missed. For 744 hours dibs was keeping a record and did not reach this section. Nothing before 25 August at 01:00, where this section's record starts, has a read either way, which is 165 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, and that was 6 hours ago. It is where the line stops, not where the count is now.

Show the readings (8)
Recorded Enrolled Capacity Status Waitlist Hours read
1 Oct 16:12 34 34 closed - 89 of 692
2 Sep 21:40 34 34 closed - 3 of 13
2 Sep 09:40 33 34 open - 32 of 135
27 Aug 19:40 33 33 closed - 3 of 10
27 Aug 10:40 31 33 open - 37 of 138, 80 no hourly record
21 Aug 17:40 31 31 closed - no hourly record
20 Aug 14:40 30 31 open - no hourly record
18 Aug 04:30 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

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