Water and salt are compounds made of the combination of more than one type of atom. Which statement is false? A. Because they they are are compounds, compounds, they they cannot cannot be be pure pure substances.
B. Both compounds compounds are are considered considered pure pure substances.
C. These compounds compounds have have specific specific physical physical properties properties that that never never change.
D. These compounds compounds have have distinct distinct chemical chemical properties.

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b is the correct answer

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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-

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