how to change the refill on a mont blanc starwalker metal & rubber ballpoint pen
Metal rusting (corrosion) is a chemical change.
Physical. The metal wire is still a metal wire after the change.
No change.
The density of the metal doesn't change when you crush a can.
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.
A metal Surface being ground is a physical change, not a chemical change.
Physical. The properties of the metal do not change, and it can be undented.
This would be a physical change because there is no change in the chemical make up of the metal and there is no creation of new substances there is simply a change in state for the metal.
It is a physical change because you are changing the shape of the metal.
Yes. It is a reaction between the metal and oxygen.
It depends on what metal is 'rusting'.
No. It is a physical change because the chemical composition of the metal remains the same.