Question

Which of the following is a physical change?

A newspaper burns when placed in a fire.
An iron chair rusts when left outside.
A sample of water boils and releases gas.
A plant changes carbon dioxide and water into sugar.

Answer 1

An iron chair rusts when left outside

Answer 2

When water boils, it is a physical change. Just like when it freezes. You can change it back to its original state. That is the difference between a physical and chemical change.

I hope this helps!
~kaikers