A student believes that a sample of solid RbCl may be contaminated with CsCl(s). Knowing that pure RbCl(s) contains 29% chlorine by mass, the student performs an experiment to determine the mass percent of chlorine in the sample of RbCl(s). Which of the following would support the student's claim that the sample of RbCl is contaminated with CsCl? A. 23%.
B. 52%.
C. 29%.
D. 37%.

  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-

there is none because earth is stationary and flat.

12 is it do you think so