The two foremost expectations that I have in my classroom are a sense of mutual respect and a positive attitude. Only with these in-hand is learning possible!
Additionally, I expect each student to:
Attempt each assignment
Turn in each assignment on time (although I do except late-work)
Participate in classroom discussions/debates
Refrain from using their phone in class
Limit computer usage (in class) to classwork/studying
Ask questions! (When stuck or when curious)
Keep conversations generally-focused on day's lesson and appropriate for a classroom; of course, socializing is healthy and normal so long as it does not detract from class objectives
Come to class each day with a pen/pencil, a notebook, and a charged Chromebook