Is build a jigsaw puzzle is it physical change?

Building a jigsaw puzzle is a physical change. Here's why:

* No new substances are formed: You're simply rearranging the pieces of the puzzle. The material of the puzzle (cardboard, wood, etc.) remains the same.

* The change is reversible: You can easily disassemble the puzzle and return the pieces to their original state.

* No chemical bonds are broken or formed: The process doesn't involve any chemical reactions.

In contrast, a chemical change would involve the formation of new substances with different properties. Examples of chemical changes include burning wood, cooking an egg, or rusting iron.