Identify the missing coefficient in the balanced equation and classify the type of reaction. c2h5oh + 3o2 ⟶ + 3h2o 2; combustion 2; neutralization 3; combustion 3; neutralization

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻

The answer is a its density hope i

My best guess is that most of the earth would freeze causing an almost ice age like catastrophe

Issa b bc when you in the air it gets cooler ghee