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I'm probably not the most reliable source of information on this since I just recently started College, but I think it really just depends on the instructor/professor you have as well as what class you're in. For example, today I took a math test where it was basically all just show the work on the paper and get credit as long as you have your final answer circled. In other classes, such as English, they might prefer to do multiple choice since they often have you read passages and want you to make sure you understand the passages. I don't think there is a definitive answer to this, but really, it just ultimately depends on your professor. I think for Chemistry your teacher will ultimately decide.

Good luck tomorrow BTW. Hope it goes well. Not sure if this was the most helpful piece of info, but hey, glad I could at least try to help.