Virtual Experiment-Reversible and irreversible changes

Task : Individual Task.

Click Links : http://www.bbc.co.uk/schools/ks2bitesize/science/materials/reversible_irreversible_changes/read1.shtml

Introduction 

Irreversible changes, like burning, cannot be undone.  Reversible changes, like melting and dissolving can be changed back again.

Mixture can be separated out by methods like filtering and evaporating. Experiment on ; Irreversible changes, Reversible changes, Dissolving and separating mixtures.

COULD DO

What happened to the Salt if add with water?  What the substance called after the process?

SHOULD DO
Chocolate is the reversible changes category, state the process of the changes based on experiment.


MUST DO
Can we separate the mixtures of sand and gravel? What we use to separated the mixture?