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Slicing bread is a physical change because it does not change the chemical composition of the bread.
chemical
It is a chemical change because you can not return it to bread
chemical change
It is chemical change
Both, the reddish spots are rust and a chemical change. You will also find (after you have rubbed off the rust) that the surface of the knife is pitted. These pits are a physical changed caused by the chemical reaction.
Slicing bread is a physical change because it does not change the chemical composition of the bread.
bread is a chemical change, not a physical change
Slicing bread is a physical change, because each slice of bread has the same chemical composition as it had before it was sliced.
chemical
It is a chemical change because you can not return it to bread
Physical
chemical
chemical change
It is chemical change
chemical change
It is a chemical change.