Question

which of these is a physical change? an object is cut into pieces rust is formed on a nail in water

Explanation:

A physical change alters the form or appearance of a substance without changing its chemical composition. Cutting an object into pieces only changes its physical form. Rust formation on a nail is a chemical change as a new substance (rust - iron oxide) is formed through a chemical reaction with oxygen and water.

Answer:

an object is cut into pieces