We talked about materials that change when they are heated or cooled. We found out that chocolate turns from a solid to a liquid when it is heated, and can be reversed when it is cooled down. We had fun finding out by melting chocolate buttons in our hands whilst listening to Michael Rosen's "Chocolate Cake" poem.
We explored materials that change when heated but cannot be changed back. They are called irreversible changes. We predicted if egg, cake mixture, dough and clay were reversible or irreversible changes.