Also, if you've got a long commute and/or you're bad with mornings I'd strongly suggest putting your chem prac in the afternoon. Every chem prac is assessed (about 5% of your total mark iirc) and you can't be more then 5 minutes late.
1. Breaks are fine. Partial to two hour breaks over one hour breaks - you can have a rest, and then get a bit of work done.
2. They'll usually cover the previous weeks content in tutorials, so it doesn't matter.
3. Yep, there's a ten minute break between lectures (they start at 5 past the hour, and finish at 5 to the hour.) If they're running overtime,
most lecturers won't mind if you pop out early - just make sure you're at the back. First year lectures are usually much better finishing on time then later year lectures.
4. No such thing as an average student, but I'd say yes. You'd have a day off every fortnight if you move the chem tute. It's really just luck - it's more uncommon in science because we tend to have more contact hours.
How regular are the chem pracs?
Six a semester - but may not be fortnightly.