Question

How do the pieces of wax change

Answer 1

Answer:

due to the rise in temperature the wax get melted and its shape changes

Answer 2

$\huge\mathcal\blue{\mathbb{\boxed{Answer}}}$

The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. The burning of the wax vapour is a chemical change.