chemical change
Chemical, because the disaccharide in toast when heated become hard thus giving you toast
It can be used both as a verb and a noun. I am toasting bread by the fire. (verb) The toast can have marmalade spread on it .(noun).
This is WHY we call it toast. It is browned bread!! Toast goes brown because of the Maillard reaction. Quote from the Related Link: "The Maillard reaction is a chemical reaction between an amino acid and a reducing sugar, usually requiring heat."
The electrical energy from the toaster is transformed into thermal energy to toast the bread.
Chemical
If it is a doublet, where you change one letter at a time to make another word until you eventually reach toast, then the answer is: bread-->breaK-->bLeak-->bleaT-->bleSt-->blAst-->bOast-->Toast If it's not, then it could possibly be the the "change" of moving the "r" in bread to the end of toast, which would give you toastr. A toaster toasts bread, which would change bread into toast.
it is a physical change
The toaster contains a variable resistor (timer knob on the outside) that changes the charge rate of the capacitors. When the capacitors are fully charged, the release the toast.
Lightning is really hot. If you put a marshmellow somewhere in a thunderstorm, and if it gets struck by lightning, I wouldn't say it'd be toasted. It'd be burnt!
Burning toast would be a chemical change. The bread would be changed into carbon and the reaction can not be reversed.
Physical change.
chemical change