Year of production: 2016
Duration: 04:22 minutes
"The subject of this film is iodine, an element in the halogens group. At room temperature, iodine is gray flakes with a metallic shine. But even when just heated gently, iodine gives off a violet gas. That is where the name of the element is from - it is derived from the Greek word ""ioiedis"" which means violet.
Like all halogens, iodine forms diatomic molecules. They are held together by van-der-Waals forces and form a regular molecular solid. If iodine is lightly heated, it begins to sublimate. That means it turns from a solid physical state into a gaseous state. If the iodine gas comes into contact with a cooled object, for example a cooled test tube, it resublimates again. Solid iodine then forms on the cooled test tube in needle-shaped crystals. This film shows different reactions that involve iodine."
At the end of the purchase process you can choose between the delivery types
Download and USB stick.
No GEMA fee.
Protected by copyright.
Classroom license for unlimited use in your lessons
School license for unlimited use at your entire school
Flatrates are subject to the license conditions stated in the product text