Don't get mixed up about the differences between elements, mixtures, and compounds! Part one of a six-part series discussing these important classifications of substances illustrates simple tests one can perform to determine a material's...

Two hundred years before Mendeleev created the periodic table, scientists observed patterns in the elements and tried to sort them. The brief first video in a 15-part series explains the development of the periodic table and the many...

Beginning with how different animals excrete waste, this short video moves on to the human excretory system from the kidneys, to capillaries, to the loop of Henle, to the excretion out of the body. 

This lesson will introduce the systematic classification of matter used in chemistry, defining the terms heterogeneous, homogeneous, pure substance, mixture, compound, element and providing examples.

Created to teach students of the 21st century, SOPHIA is bringing classification of matter straight to your fingertips. Become the commander of your own learning experiences as you take part in this interactive tutorial. [4:52]

This lesson will introduce chemistry as the science that studies matter: its classification, structure, properties and changes.

Just like groups of people have major things in common, so do different materials. So how does that work? How can we group materials by their properties? Find out by watching this video. [4:31]