Long hair is cut and dried. A wooden pencil is sharpened and breaks. An ice cube melts and becomes a clear liquid. An iron nail becomes orange and flaky on the surface.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which action demonstrates a chemical change?
Possibilities:
- Long hair is cut and dried.
- A wooden pencil is sharpened and breaks.
- An ice cube melts and becomes a clear liquid.
- An iron nail becomes orange and flaky on the surface.

An iron nail becomes orange and flaky on the surface.