Question

which of the following shows a physical change taking place?
a banana turning brown and soft
toasting bread until it burns
iron reacting with oxygen and forming rust
tearing a piece of aluminum foil into small strips

Explanation:

A physical change involves a change in the form or appearance of a substance without altering its chemical composition. Tearing aluminum foil changes its shape but not its chemical makeup. Iron rusting (a chemical reaction with oxygen), bread burning (decomposition due to heat - a chemical change), and a banana ripening (involves chemical reactions like starch to sugar conversion) are all chemical changes as new substances are formed.

Answer:

Tearing a piece of aluminum foil into small strips