Here's a video from the Evaluate section in the "Pure Substances and Mixtures" 5E Lesson. This section aims at reviewing and evaluating newly acquired knowledge: it includes a video which goes over the material taught in the unit, and a final self-correcting test based on the principles of skill assessment.
![](https://s2.save4k.ru/pic/88MBCyiaPSM/maxresdefault.jpg)