Si se disuelven 20 ml de alcohol en 80 ml de agua ¿cuánto es el % de alcohol en la solución ?

Explanation:

% vv = ml solute × 100

             ml slc

ml solution = ml solute + ml solvent

                  = 20 ml alcohol + 80 ml water

                  = 100 ml solution

% vv = 20 ml × 100

            100 ml

% vv = 20%

Girl above me is definetly right

Explanation:

  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-

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).