To respond to your questions eliwilliam,
1) Although the labs are supposed to be an extension of what is learned during lectures, it is not imperative that you have lectures before the lab. In fact, you'll find that the lecture material probably isn't as related as you expect it to be (not until you're in upper years at least). As well, the first week of labs is usually safety so you'll have a few lectures before the lab anyways.
2) Chemistry doesn't have tutorials, however biology and math do. Generally in tutorials, such as for math, the TA has questions that you practice as a group for upcoming tests, or they take up midterm questions, etc. TAs go over concepts from lecture and give mini-lessons as needed. The tutorial is there for you to ask questions! There are no assigned questions, and what goes on in tutorials is not for marks; however, this is the place where you usually get back tests, assignments, midterms, etc.
3) I don't think your Friday schedule is that bad. You're right in saying that the chem is EOW, so that'll free up some Fridays. I've had schedules where your day starts at 8:30am and you're in labs until ~ 7pm at night. You'll get used to it
Hope that helps.
Best of luck as you all start classes in a couple of weeks!
Sarah