You have been given two unmarked containers. In one is a sample of salt water and in the other a sample of fresh water. You are asked to identify which is which, without tasting them. Explain the procedure you would use to do this. (I’m in 8th grade and this is science)

  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-

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.