# Is a change of the state (or phase) of matter a physical or chemical change?

A phase change does not involve changing the identity or makeup of that species. When you take solid ice and melt it (add enough energy to it) it changes to water, which is now a liquid. It's still water because if you could see at the atomic level, you would still see ${H}_{2} O$ present. The arrangement is just a little different now.