14. Answer briefly II

1. Why are utensils made up of aluminium and brass?

 

Aluminium and brass are used in cooking utensils because they are bad heat conductorsgood heat conductors.
Aluminium will develop a protective oxide layernitride layer that prevents further reaction. Also, since aluminium is very inexpensive, it is widely used in the manufacture of utensils.

  

2. Define a Alchemy.

 

Alchemy was a form of chemistry studied in the middle age, which was concerned with discovering ways to change ordinary metals into silverplatinumgold.