To refresh bread that had gone stale.
yes I suppose if you put it in there long enough it will start toasting
No, you can only toast bread.You can in theory if you partly toast bread then toast it again at a later period, then you would be toasting toast, as the first toasting changes the bread. toasting a full toasted toast would make it burn and possibly start on fire.
Toasting bread is a chemical reaction.
Conduction
No.
no
its a physical
Yes because it is a chemical reaction and these reactions are irreversible
No.
It is a chemical change because you can not return it to bread
chemical change
It is chemical change