What are the 2 common uses for Copper?

Can someone me with questions 15 to 17 plz.

The identities of substances are the same before and after which type of change

According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another? the volume and the shape stay the same. the volume increases to fill the new container, but the shape stays the same. the volume stays the same, but the shape changes to fit the new container. the volume and the shape change to fill the new container.