2C, H.19)
70, (9) + 400, (9) + 6H,00).

g) 400 (h) 1331 (i) 11 (j) 20 (k) 13 (l) 15 ... (e) 1 , 2, 3, 6, 9, 18 (f) 1, 5, 25 (g) 1, 2, 4, 5, 8, 10, 20, 40. (h) 1, 2 ... 19. 70 x. (h) x. 6. (i). 9. 8 x. (j). 27. 24 x. (k). 5. 4. 20 a b. +. (l). 8. 3. 24 x y. +. (m).

  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 right answer is c i just did the question.