I'm a high school chemistry teacher with a doctorate in organic chemistry.
Iv'e been teaching chemistry for a number of years for the international syllabus and put a great deal of time and effort into myy ppts to make them a close companion to the textbooks being used.
The ppts range from anywhere between 20 and 150 slides depending on the topic, and are incredibly detailed.
a ppt for the new CAIE syllabus from the new pink Cambridge University Press text book
62 slides discussing:
experimental design
separation and purification
chromatography