Question

Physical change= melting of wax
Chemical change=__________

Answer 1

I have answer to your question:
Physical change = Melting of wax
the physical structure of wax changes when heated. It changes from solid to semi liquid or in jell form
The atoms of wax detach and the state of matter changes
Chemical change= Burning of wood
the wood when ignited have change of energy. wood initially have chemical energy stored initially. when burned this energy changes from chemical to heat energy

Answer 2

A chemical change occurs when one substance combines with another substance to form a new substance. Alternatively, it can also refer to the decomposition of a single substance into two or more less complex substances.

One of the simplest examples of chemical change is water that is formed by a chemical reaction between Hydrogen and Oxygen.

2H2 + O2 -> 2H2O