It is a chemical property.
Radiation would be a chemical property. Remember, a physical property is something that does not change the composition or "identity" of a substance whereas a chemical property is something that does. Since anything exposed to radiation for a good amount of time would experience change in composition, it is thus referred to as a chemical property.
its turns green and weird colors.
First of all rust is formed when iron is exposed to both oxygen and water/ water vapopurs. The formula for rust is Fe203.xH20. Now the x varies which determines the extent to which rust is formed. Basically Rust is formed throughout the surface of the iron thus preventing rusting of the inner layers.
First, copper doesn't "turn green," it reacts with oxygen in the air to form copper oxide. This is a chemical change, because copper oxide is a substance that was not there before.
It is because an apple have some iron so when it is exposed into air the iron gets oxidised and turns reddish/ brown.
PHYSICAL
Thickness is a physical property without any relation with chemical composition or chemical changes.
Radiation would be a chemical property. Remember, a physical property is something that does not change the composition or "identity" of a substance whereas a chemical property is something that does. Since anything exposed to radiation for a good amount of time would experience change in composition, it is thus referred to as a chemical property.
It is a chemical change.
chemical
its turns green and weird colors.
Physical, Since only the property of the chocolate didn't change, after it melted, it still is chocolate
wind and water
Rust is Iron Oxide which has accumlated on top of the iron. The top layer of the iron, when exposed to moisture or water, reacts with the oxygen in the air to form rust. Rust can also form when Iron is exposed to a strong oxidizer or acids. But rust is not a chemical property of iron, it's in fact a completely different compound which used to be iron before reacting with oxygen.
Some compounds undergo photo(light)degradation or photolysis when they are exposed to light. Some chemicals are stored in brown bottles due to this reason.
it is a chemical change because copper is one of the elements on the periodical table .
erosion, acid rain...