Could someone please help me solve number 6.
If you do more it would be appreciated:)

  ¹₀e

Explanation:

Nuclear reaction:

           ²⁷₁₃Al          +        ⁴₂He          →         ³⁰₁₅P   +    ?

Problem is to balance the nuclear equation:

In balancing nuclear reactions, there is conservation of mass numbers and atomic numbers, i.e. the sum of mass numbers(superscript) on the product side must be equal to the sum of the mass numbers on the reactant side.

The sum of the atomic numbers(subscript) on the product side must be equal to the sum of the atomic numbers on the reactant side.

            ²⁷₁₃Al          +        ⁴₂He          →         ³⁰₁₅P   +    ₐⁿX

for the mass numbers:

             27 + 4  = 30 + n

                 31 - 30 = n

                      n = 1

for the atomic numbers;

             13 + 2 = 15 + a

                a = 15 - 15

                a = 0

The specie is ¹₀X

This unknown specie X is indeed a positron.

                       ¹₀e

  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-