I think dhatt the answer is a physical change because if you just bent it then surley you can unbent it and still have a piece of metal.
Physical. The properties of the metal do not change, and it can be undented.
About 100°C heat can cause it to melt(which is a physical change)
For example is melting.
It is a physical change.
Crushing a piece of chalk is only a physical change. Chemically, it is still chalk.
Physical. The properties of the metal do not change, and it can be undented.
Of itself a metal can not be "shortened". However, a metal OBJECT such as a piece of metal wire can be shortened by cutting a piece off. This would be a physical change.
Physical
chemical change
Hitting with a hammer
About 100°C heat can cause it to melt(which is a physical change)
For example is melting.
It is a physical change because only its shape changed, not its chemical composition.
Physical change
It is a physical change.
It is a physical change.
this is a physical change