In which of the following processes is heat used, but the change is physical?

Answer: D. Melting of ice

Melting ice is a physical change because it only involves a change of state from solid to liquid without altering the chemical composition of water . While heat is used to break the bonds between the molecules to cause melting, the process remains physical and is easily reversible by freezing the water back into ice.

Answering after opening this box earns no Practice Points.