Watch Iodine - School Movie on Chemistry

Iodine forms diatomic molecules which are held together by van-der-Waals forces and form a regular molecular solid. If iodine is lightly heated, it begins to sublimate. It turns from a solid physical state into a gaseous state. If the iodine gas comes into contact with a cooled object it resublimates. It then forms in needle-shaped crystals. This film shows different reactions that involve iodine.