Here's why:

* Chemical reactions involve the formation of new substances with different properties. The kiwi fruit itself is not chemically changing into plastic.

* The kiwi is being preserved, not transformed. The plastic-ware acts as a container to prevent the kiwi from decaying or being eaten by insects.

* The process is physical, not chemical. The kiwi remains the same chemically; its physical state is altered by being placed in plastic.

In summary, the process of preserving kiwi in plastic-ware is a physical change, not a chemical reaction.