Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-
molecular theory?
more gas particles → more collisions → higher pressure
smaller volume → crowded particles → less collisions - lower pressure
smaller volume crowded particles → more collisions - higher pressure
more gas particles → more kinetic energy → more volume → higher pressure

  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-

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.