So I've come to realize that my least favorite thing about teaching inorganic chemistry is grading their homework assignments. I typically have about 15 students and in the past I have assigned weekly graded problem sets. They are allowed to work together on the homework, but must hand in individual papers. I get bogged down in the somewhat mindless repetitive task of grading their assignments. That said, I do tend to try and challenge students through homework and it has typically been a reasonable chunk of their grade in this class (20%) which helps to balance the difficult exams. How do you all handle homework in Inorganic? Ideas I've thought of are listed below and I'd like to hear your thoughts on different approaches.
1) Continue assigning and grading the HW assignments as usual
2) Continue assigning weekly fraded homework but having a student grader
3) Give students "suggested" problems but do not collect anything for grading (but post answer keys)
4) Assign problems and then grade only selected problems
5) Assign problems and grade on a simple check plus/check/check minus system