* Physical Change: A change in the form or appearance of a substance, but not its chemical composition.

* The gasoline remains gasoline, even when it's in the tank. Its chemical formula (C8H18) doesn't change.

* The change is simply a change in location.

* Chemical Change: A change where a new substance is formed with different chemical properties.

* Examples of chemical changes involving gasoline include: burning it (combustion) to release energy, or mixing it with certain chemicals to create new compounds.

In short, pouring gasoline into a tank doesn't alter the gasoline's chemical makeup. It's only a change in its physical state (from being in a container to being in the tank).