Action of heat on Copper II Sulphate

Instructions:

1. Place about three spatulas of dry copper II sulphate in a dry test tube.
2. Heat gently at first and then strongly until no further change occurs. You may need to use a spatula to prevent cakeing of the copper II sulphate by breaking up the lumps that form.
3. Allow to cool and empty the residue into a dry evaporating basin.
4. Resting the evaporating basin on the palm of your hand, add water dropwise from a pipette.

Record your observations carefully and consider the following when writing up your experiment

Which principles do you think this experiment demonstrates?

What would happen if the experiment were performed in a sealed (shatter-proof) tube?

Would this demonstrate any other principle?