thin steel wool
Steel wool is a Mixture-Mechanical
Copper is deposed on the steel wool.
Steel wool is not soluble in water, neither can it absorb water but can get wet so if you take the steel wool out of the water the wet (due to capillary action and surface tension) steel wool will weigh more than dry steel wool. Then the steel wool will rust (and the mass will increase because oxygen unites with iron to form the rust).
A physical bond. Steel wool is composed of fine fibers of steel spun together to hold shape as a "bun" of fibers, but its merely a loose physical bond.
Heterogeneous
thin steel wool
steel wool is steel made from wool, so it would be neither
the wool does not rust
Steel wool is a mixture.
The steel wool gets wet. If you take the steel wool out (into the air) again it will rust.
Steel wool is a Mixture-Mechanical
Steel wool
Depends on whether you leave the steel wool in the Pepsi. If you take it out, the water in the Pepsi will cause the steel wool to rust away. If you leave it in, the phosphoric acid will slowly dissolve the steel wool.
Melting the steel wool is a physical change.
steel wool dome @#$%
if you put steel wool at the tip of a 9 volt battery