If your chicken has white dots on it, you should visit the doctor and get that checked out
Yes.
It's safe as long as you cook the chicken to 160 degrees F.
no
No. It is not safe.
No, not unless frozen.
You can use glassware or any microwave-safe dish to cook chicken in the microwave. Check the bottom of any plastic dishes to see if they are microwave-safe.
Of course
As long as the chicken was thoroughly cooked and reached the appropriate temperature in all parts of the chicken, it should be safe to eat.
No. Chicken dropped on the floor is not safe to eat as is. If the chicken is raw, it could be rinsed off and cooked. If the chicken was cooked, I'd suggest tossing it - unless you want to rinse it off and re-cook it.
Yes, because when you cook it, the bacteria gets killed off.
Appearance cannot tell you if it is safe. You need to use a thermometer and cook to an appropriate temperature.
Assuming that the beef sauce with cream (gravy) has been properly stored so that it has not been contaminated or spoiled, yes, it would be safe to cook chicken in the same sauce.
In order to be safe and keep its nutritional value chicken needs to be cooked to 170 to 180 degrees inside.