Trends in common oxidation states for main group elements. [8:37]

A collection of audio clips where scientists around the world were challenged to answer,"What is a flame". Eleven-year-olds from around the world will judge the entries. [30:21]

Paul Andersen explains how redox reactions are driven by the movement of electrons from the substance that is oxidized to the substance that is reduced. Oxidation is the loss of electrons and reduction is the gaining of electrons. [11:40]