If you can post the changes that take place I can help with distinguishing physical from chemical changes.
Just remember a chemical change must change the actual substance. Shape, freezing, cutting, etc all are physical changes because those don't change the molecular composition. That is, boiling or freezing water are physical changes because you start with H2O and end with H2O. But if you pass a current through water to get H2 gas and O2 gas then you have change the composition of the water and that is a chemical change.
It takes several steps to change the Kiwi biomass into synthetic mineral describe a physical change that occurs during this process
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