A little bit of background about my situation: I graduated very recently with a bachelor's degree in chemistry. In the last ~1.5 years or so of my undergrad, I decided to change directions and pursue a career in programming/software development. I've taken three lower-division computer science courses, as well as most/all of the math prerequisites for a CS degree, but that's the extent of my formal education in CS.
I do have a couple of research experiences, and I'm trying to decide whether I should talk about one of them, or both, in my statement of purpose. They are:
1) About a year and a half of research in chemistry. No publications, conferences, etc. though. Even though it's not at all related to CS (and in fact was one of the reasons I decided not to pursue a career in chemistry), I feel that it might be good to talk about it just to show that I've had this amount of research experience.
2) ~3 months in a computer science lab. Basically, in my second to last semester of college, I decided to try to see if I could volunteer with a computer science professor to gain experience and show graduate programs that I was serious about my new career direction. I found a professor who, very kindly, was willing to take me in despite having only a single programming course under my belt. However, due to circumstances I was not able to start until very late, and this led me to only be able to volunteer there for a couple of months. Also, I'm not sure that the things I did would really be able to be classified as "research," even though I was formally called a "research assistant." Basically, the professor gave me a small project to do, which was related to his area of specialization, but was really more of a "learning experience" for me than anything else (ie., it was mostly for my own learning benefit, not to contribute to the lab's research). While the Ph.D student I worked under told me I exceeded his expectations with the project, I'm not sure I really did anything substantive enough to include in my PS. I'm also kind of concerned how graduate programs would look on this kind of experience.
So my question is... Should I talk about chemistry research, or CS experience, or try to talk about both even though they're not at all related?
Thanks in advance.