AFTER an interruption due to the War, I have re-commenced experiments aiming at the separation of molecules having a permanent dipole moment from non-polar molecules in liquid mixtures by the aid of a ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

Have you ever helped with cooking and gotten oil on your hands? It’s hard to get off! Rinsing with water does not work; you need to use soap. The reason is the molecules that oil and water are made of ...