For each item, choose whether the change is a physical change or chemical change

What is the polyatamic ion of borate

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

What term describes technology that operates on an atomic level