We have been investigating how materials change when they are heated or cooled. We have looked at reversible and irreversible changes and have also made simple predictions and then evaluated them. We found out that ice was a reversible change once it had melted we could re freeze it to turn it into ice again. We found out that once bread is turned into toast it can not be changed back into bread so that makes it a irreversible change. We also looked at candle wax and chocolate.
Science - Ice and toast