We have been exploring changes in states of matter. Matter can change from a solid to a liquid, or a liquid to a gas. We have discovered that sometimes matter can change back to the way it was before. This is called reversible change. Sometimes matter cannot change back. This is called irreversible change.
We have explored reversible and irreversible change through a number of experiments. We tried changing an ice cube into a liquid. This is reversible. We tried making toast, but burnt the second slice. We discovered that we can't change it back. It is burnt forever! This is irreversible change.
We tested out chocolate chips. What happens when we heat chocolate? It melts! It changes from a solid to a liquid. We chilled the chocolate and discovered that it changed back to a solid. This reversible change was quite delicious.
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