120A is one of the first difficult classes for chem e's. He does a pretty good job at tackling the class and occasionally makes a few errors but that is normal. Make sure to read the book and do the examples or you will have a tough time in the class.

Helgeson is not the best lecturer in the world and makes occasional errors but is incredibly invested in what the material is about. The coursework is difficult but manageable, though more practice than just homework problems should be done to succeed.

The professor does things like pop quizzes and spot grades, and the homework makes this course very unpredictable. He also will get mad if you email him for help. He put a section of material that was not covered in the lecture or part of the assigned readings and stated that it was a section that we did not need to read but put on the exam anyways

120A is a behemoth of a class, fluid dynamics is often some of the most technically difficult math you will see in your coursework, so I know that Professor Helgeson did his best with an already confusing and hard subject. I appreciated that he was willing to meet me for extra tutoring, because I really struggled in exam-taking for this class.

Professor Shell waxes poetic about the usage of Maxwell relations in this class. I personally am anti-differential equations, but I appreciate Professor Shell's diligence in making sure we understood the class content. He is very accessible during office hours and will give you the "hot goss" on professionalism and grad school during recitation.

120A Mid lectures at best. Easy midterm but impossible final worth 40%. One of the problems we never once did anything related on a HW so no practice. I stg he picks HW problems via throwing at a dartboard, not whats covered in lecture. So many errors in notes, HW solutions, even exam questions. I feel like I barely learned anything. Underwhelming