Chlorine has many
different isotopes, but almost all chlorine
atoms are either chlorine-35 or chlorine-37. a
chlorine-36 isotope also exists. suppose your
job is to produce a brochure that compares
and contrasts these isotopes. list three
questions you would ask and answer in your
brochure.
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  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 volume increases

d

explanation: