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This is not a chemical change.
yes
A water pipe bursting is a physical reaction. It does not involve any chemical changes in the water itself, but rather a physical change in the structure of the pipe, causing it to break and release the water inside.
When water changes state from a liquid to a solid, it is undergoing a physical change. The chemical structure of water is not altered, so no chemical changes have occurred.
It is a physical change, because a section of pipe would react the same chemically as the original iron would. You can crush or melt the pipe back into the formless mass of iron that you started with.