IGCSE Chemistry topic 11, part 1 – Water:
http://www.youtube.com/watch?v=-BZKRLXapCY&feature=share&list=PLthIRQZYW9MLUwo1I3RGFCnzOy3CypB3
A short video form The Virtual School – testing for water:
AIR:
IGCSE Chemistry topic 11, part 2 – Air:
http://www.youtube.com/watch?v=zK65qHtULRE&feature=share&list=PLthIRQZYW9MLUwo1I3RGFCnzOy3CypB3c
RUSTING:
IGCSE Chemistry topic 11, part 3 – Air: rusting & carbon dioxide:
http://www.youtube.com/watch?v=Gcfk96aJY6U&feature=share&list=PLthIRQZYW9MLUwo1I3RGFCnzOy3CypB3c
IGCSE Chemistry, a 25m lesson from ChemistryKlipz covers rusting from 11m to 13m 50s.
GCSE s-cool – Rusting – revision notes.