Which of the following is an example of a chernical change?
boiling water
burning paper
dissolving sugar in water
melting gold

Burning paper.

Explanation:

A chemical change is a change that changes the molecular structure of the substance you are changes. Boiling water would make water vapour, which is still water thus it is a physical change. Dissolving sugar in water is still sugar in water thus it is a physical change. Melting gold makes liquid gold which is still gold thus it is a physical change. Burning paper however changes from paper to ash and smoke, which are different on the molecular level, therefore it is a chemical change.

Coal i believe hope this