Question

which of the following is considered a physical change? rust forming on an old nail cutting wood into pieces to build a doghouse burning wood in a fire

Explanation:

A physical change is a change in which the form or appearance of matter changes, but not its chemical composition. Rusting is a chemical reaction (iron reacting with oxygen to form iron oxide). Burning wood is a chemical change as it involves a reaction with oxygen to produce new substances like carbon - dioxide and ash. Cutting wood into pieces only changes its physical shape and size, not its chemical makeup.

Answer:

cutting wood into pieces to build a doghouse