answer; /// the amount of material dissolved in a measure of liquid(concentration) the above statement is (true); /// good luck
put the answers and i could answer.
the balanced equation for reaction of ca metal with o2 to produce cao is as below
2 ca+ o2→ 2 cao2
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 have no clue hope you find the answer