1. Too general to answer. All the world is is chemistry. And biology. And physics. And math. Or not.
2. You're too nice a guy, and I'm too polite to relates. (plus I forgot)
3. I like most of all, solving a problem no one else can solve, then saying, "Oh that little thing, yeah, 'took care of it for ya. K thx bye."
4. Paperwork. It is a little daunting to chronicle your experiments to the satisfaction of a regulatory board. If you don't like paperwork, quit the sciences -- no one is going to pay you to perform experiments without documentation.
5. After school, there is often specific safety training in the workplace, and specific training on the instruments and procedures in the lab.
6. Its hard to say. Generally, chemists and biotechnologists are at the high end of the median for recent college grads. A quick check online for salary rates based on discipline will bear that out.