Molecules that possess only london dispersion forces will have roughly the same melting points. true false

False

Explanation:

Non polar molecules possess dispersion forces due to momentary shifts in the electron cloud of the molecule. The molecular mass is important in deciding the extent of London dispersion forces. The greater the relative molecular mass, the greater, the greater the degree of London dispersion forces and vice versa. The greater the degree of London dispersion forces, the greater the melting and boiling points. Since all molecules possessing London dispersion forces do not all have the same relative molecular mass but widely different relative molecular masses, they cannot all have roughly the same melting point.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-