A cell from the heart muscle must continually use energy to contract which causes the heart to beat. Muscle cells in the heart would have an unusually high proportion of: A) Lysosomes
B) Mitochondria
C) DNA
D) Golgi bodies

So, the melting of wax and vapourisation of melted wax are physical changes. Chemical Changes : The wax near flame burns and gives new substances like carbon dioxide, carbon soot, water vapour, heat and light. LPG is another example of a familiar process in which both the chemical and physical changes take place.