Question

why do all the metal pieces get polished before the expiriment​

Answer 1

Answer:

Metal pieces are polished before the experiment because to remove the topmost layer of it as when the metal is burnt the metal oxide will prevent the metal piece from further oxidation.

Hope it helps :)

Answer 2

Answer:

Metal prices are polished before the experiment because to remove the topmost layer of it as when the metal is burnt the metal oxide will prevent the metal piece from further oxidation..