As someone who acquired a PhD in chemistry, let me try to shed a little light on the process. In many programs, the progression through the requirements to be granted the degree look like this:
1. One year of full time classes taken while teaching undergrad classes to support yourself. GPA must be a 3.0 minimum. Strong pressure from research advisor to finish all classes during first year to get you into the lab as completely devoted slave labor ASAP.
2. Comprehensive exam taken at the end of first year with three chances to earn a passing grade or take specific subject matter exams with a requirement to pass a minimum proportion of them (e.g. 6 out of 9 given during your second year in residence). Different departments utilize each exam system. Pass exams under applicable system or get dropped from program.
3. Take propositional oral exam. Preparation usually requires about three months. This is often five of them (faculty) taking on one of you in a small closed room. Yes, it is is an exercise in intimidation.
Here you play research advisor and design a program that someone else could complete to obtain their PhD. The research must have the potential to materially contribute to the science. Passing or failing is completely subjective and there is no appeal of a failed grade.
4. Perform endless research for 3 to 6 additional years under unsafe conditions while either teaching to support yourself or living a meager existance being supported on a stipend from a research grant. This means long hours and dangerous working conditions followed by more long hours waiting for instrument time, chemicals to arrive, experiments to cook, etc., etc., etc.............................................Very hard to negotiate an end to the research since once you are adept in the lab, there is an interest on the part of your advisor to keep you as cheap labor pumping out publishable research advisor agrandising material. Strong potential for endless abuse in this type of situation. Keep in mind that you actually need some new science that works. You cannot write a completely negative thesis. People often spend years searching for a new bit of technology that actually works.
5. Give departmental seminar. Read articles from the literature and give a public talk. Not a very useful exercise.
6. Write up and defend thesis.
7. Leave and never return or speak to anyone at the department where you did your graduate work. The bitterness runs that deep.
8. Try to find work. Any work. I mean any work at all. ................................................You mean I spent five (or six or seven or eight) years earning a graduate degree that does not qualify me as interesting to any employer outside of academics???????????!!!!!!!!!!!!!!!!!!!!!!!
I need some money!!!!!!!!!!!!!!!!!!!!!!!!!! I am going to be evicted from my roach infested hovel of an apartment if I dont come up with some coin NOW!!!!!!!!!!!!!!!!!!!!!!
9. Drink heavily before applying at temp agency.
That is the PhD experience in a nutshell. Do not go here. Get an MD that actually gives you a chance to participate in the work force. Forget about respect for a PhD. Nobody cares about your degree.