Hg is not a change, it is an element. It can undergo changes, both physical and chemical.
A physical change
Physical change of the paint, not the door.
it is a chemical change
Crushing charcoal into powder is a physical change, as it alters the size and shape of the charcoal without changing its chemical composition.
An acid is a chemical compound, not a physical or chemical change.
It is a physical change.Density is not a chemical property. Instead, it is a physical property.
The melting of a coin due to heat is a physical change as it alters the physical state of the coin from solid to liquid without changing its chemical composition. The black color that appears is likely due to the formation of an oxide layer on the surface of the coin, also a physical change.
Chemical broooooooooooooooo niga
Physical change is a change in the structure. Chemical change is a change in the composition. Melting is a physical change. Complexing is a chemical change.
Physical change
A change in temperature can change the rate of physical or chemical change.
Burning is a chemical change.