A log gives off heat and light as it burns. A tree stores energy from the Sun in its fruit. A penny lost in the grass slowly changes color. A water pipe freezes and cracks on a cold night.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is an example of a physical change but not a chemical change?
Possibilities:
- A log gives off heat and light as it burns.
- A tree stores energy from the Sun in its fruit.
- A penny lost in the grass slowly changes color.
- A water pipe freezes and cracks on a cold night.

A water pipe freezes and cracks on a cold night.