-296+173.2+(2)285.5->-814+90.4

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

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?