Which of the following is an example of a physical change but not a chemical change?
a) the log gives off heat and light as it burns
b) a tree stores energy from the sun in its fruit
c) a penny lost in the grass slowly changes color
d) a water pipe freezes and cracks on a cold night

A water pipe freezes and cracks on a cold night. (D)

There are three physical changes going on in this scenario:

1).  The air gets cold and dark at night.

2).  The water in the pipe freezes and expands.

3).  The pipe cracks.

There are no chemical changes in the description.

are there answer choices to this question? this seems like a question where you have options to choose from.