I am studying Chemical Engineering. There is a lot of work and it is challenging, however it does give you a good sense of accomplishment when complete. An average day would have 3-4 hours lectures and 3 hours of project or lab work timetabled. You'd then probably want to spend another few hours in the evening working, and weekends if you had a project going.
There is a significant project and coursework element in this course, which is actually very beneficial. You will do a lot of work in groups, so it helps you get to know your year and to build those teamworking skills!
Though there is a lot of work, there is also a lot of support, from coursemates, personal tutors and lecturers. In first year you will also have tutors for specific subjects, and I have always found them to be very willing to help.
Just because there's a lot of work doesn't mean you can't have a social life, you soon learn how to manage your time and prioritise what's right for you.