Conservation of matter states that the reactants have to equal the products enablers 2. products and reactants in a balanced chemical reaction have the same number of of each element. atoms molecules 3. if the equation on the board had shown 3 atoms of carbon on the reactants side, how many atoms of carbon would need to be represented on the products is

1) Conservation of Matter states that the reactants have to equal the products.

2) Products and reactants in a balanced chemical reaction have the same number of atoms of each element.

3) Three (3) atoms of carbon would need to be represented.

Explanation:Number of atoms on the left and on the right side of the balanced chemical reaction is the same, for example: Mg + 2HCl → H₂ + MgCl₂. There are two hydrogen atoms, two chlorine atoms and one magnesium atom on both side of chemical reaction.

  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-

i think   the answer is c hope i'm right