A short video/audio guide explaining the essentials of fractional distillation: crude oil is a mixture, uses of different fractions, their sizes, boiling points, viscosity and volatility.
Designed for test prep, this high res animation is comprehensive in its coverage, and can also be used on a large screen as your main teaching resource for the topic.
This and many other animations, along with complementary quizzes, are available in my "Core Science: Watch and Test" app on the iOS App Store: