Please answer all subparts. thank you.

5-12. Why is it very important that the hot vapor in microscale distillations climb the column very slowly? 5-13. Why might Teflon be the material of choice for constructing microscale spinning bands? 5-14. The spinning band overcomes two major problems of microscale distillations by wiping the liquid condensate rapidly from the column walls. What are these problems? 5-15. Why are spinning bands so effective at increasing the number of theoretical plates in distillation columns? 5-16. Why is steam distillation often used to isolate and purify naturally occurring plant substances