Every major is different, what kind of moron thinks there's a "hardest" major.
I spent 8 hours a week in labs which I get no credit for in addition to a full course load. Meanwhile most theatre majors at my school would faint at the idea of more than just 6 hours of classes a week. But if you asked me to act, I couldn't, no amount of classes or learning could make it easy for me. Meanwhile if you put any of them in a lab they'd probably freak out.
College is about finding what you like, what you want to study, and what you want to do with your life. That's what makes a major easy. If you're major is so difficult to you maybe you oughta switch.
<---- Chemistry major btw.