Substances Changing: Dehydration
These downloadable videos and animations are part of the multimedia package Stuff and Substance, developed by the Gatsby Science Enhancement Programme (SEP). They can be used to develop the idea that some crystals incorporate water molecules within their structures.
Whether the change from hydrated copper sulfate to anhydrous copper sulfate is classed as a chemical change or not is debateable. More important is to understand what is happening in terms of the atoms involved. One video shows the collection of water from heating hydrated copper sulfate and the animations represent the changes in terms of atoms. A second video shows water being added to anhydrous copper sulfate to illustrate its use as a test for water.
These video and animation files form part of the resources in the section Substances Changing in the Stuff and Substance multimedia package, which provides a series of interactive pages that can be used by teachers or students in the classroom.