Registration Tip: Signing up for 200-level General Chemistry Classes for Fall Term

Many of you may be starting the 200 level General Chemistry sequence in fall term (CH231/261).  This sequence has separately numbered lectures and labs, and registering for these Chemistry classes can be confusing.  Here are some instructions to make it easier.  The issue is that the lecture and recitation sections (CH 231) and  the lab sections (261) are linked, thus registration for all  components must happen at the same time, or it won’t work.


Here are two ways to do this:


  • Use the online schedule of classes to look at Chemistry offerings for fall term (Corvallis campus offerings).  Identify the CRN’s -  For CH  231/261, you will have three - one for the 231 lecture, one for the CH 231 recitation, and one for the 261 lab,  The schedule of classes is real time and allows you to see the sections that are open.  Once you’ve identified CRN’s that will work (make sure the times you’ve chosen for the respective don’t conflict with each other), then you can add them to CRN table in the Registration system and click submit.  Provided everything is open and there are no time conflicts, you should be set


  • You can use the Advanced Search function in the online registration system to find all the necessary pieces of the class at once:
  1. Click the “Class Search” button on the main registration page.
  2. When you get to the Class Search page, click the “Advanced Search” button
  3. Highlight “Chemistry” on the list
  4. Put the number “2” in the course number box, and hit return (or you can also scroll to the bottom and click the “Search Classes” button).
  5. This will bring up all the 200-level Chemistry classes offered fall term.  Scroll down until you find CH 231, and select one lecture and one recitation. Please note that Chemistry usually has one or two recitations that are limited to Chemistry majors.  If you see +520 in the restrictions box, that is a restricted section.  Once you’ve identified your CH 231 lecture and recitation, scroll down until you find the 261 lab you want.  Choose one of the labs and make sure it doesn’t conflict with the lecture and recitation you picked.
  6. Check the boxes next to you chosen lecture, recitation, and lab, and then scroll to the bottom and click register.

If you get stuck or get confused, you can also consult this website for assistance.