"Teacher-student" (lektorstudent) Martin Amund Langaas Johansen has made several videos covering tricky concepts in organic and inorganic chemistry.

So you've heard about valence and oxidation state, but do you know the exact difference? Test your understanding with carbodiphosphoranes. Video  Further reading

Crystal field theory: A simple way to think about transition metal compounds. Video

Metal-metal multiple bonds: Quadruple bonds and δ bonds. Video  Further reading

Symmetry relationships in molecules and molecular fragments: isomerism and topicity. Video   Further reading  Advanced reading

Local symmetry groups and local chirality. Video Further reading

A simple introduction to sugars, with emphasis on stereochemistry. Video

More videos are on the way – stay tuned!