Hola?

<img src="https://tex.z-dn.net/?f=%5C%5C1%29%5C%20Cu%2BHNO_3--%3ECu%28NO_3%29_2%2BNO_2%2BH_2O%5C%5C%20%5C%5C%20Cu%5E0%20-%202e%20--%3ECu%5EI%5EI%5C%5C%20N%5EV%20%2B%20e%20--%3EN%5EI%5EV%5C%20%5C%20%5C%20%5C%20%5C%20%2F%5Ccdot%202%5C%5C%20%5C%5C%20Cu%2B4HNO_3--%3ECu%28NO_3%29_2%2B2NO_2%2B2H_2O" />Cu(NO_3)_2 + NO_2 + H_2O \ \ \ \ Cu ^ 0 - 2e - - >Cu ^ I ^ I \ \ N ^ V + e - - >N ^ I ^ V \ \ \ \ \ / \ cdot 2 \ \ \ \ Cu + 4HNO_3 - - >Cu(NO_3)_2 + 2NO_2 + 2H_2O" alt = " \ \ 1) \ Cu + HNO_3 - - >Cu(NO_3)_2 + NO_2 + H_2O \ \ \ \ Cu ^ 0 - 2e - - >Cu ^ I ^ I \ \ N ^ V + e - - >N ^ I ^ V \ \ \ \ \ / \ cdot 2 \ \ \ \ Cu + 4HNO_3 - - >Cu(NO_3)_2 + 2NO_2 + 2H_2O" align = "absmiddle" class = "latex - formula">

<img src="https://tex.z-dn.net/?f=%5C%5C2%29%5C%20Fe%2BCuSO_4--%3EFeSO_4%2BCu%5C%5C%20%5C%5C%20Cu%5E0%20-%202e%20--%3ECu%5EI%5EI%5C%5C%20Fe%5EI%5EI%2B2e--%3EFe%5E0" />FeSO_4 + Cu \ \ \ \ Cu ^ 0 - 2e - - >Cu ^ I ^ I \ \ Fe ^ I ^ I + 2e - - >Fe ^ 0" alt = " \ \ 2) \ Fe + CuSO_4 - - >FeSO_4 + Cu \ \ \ \ Cu ^ 0 - 2e - - >Cu ^ I ^ I \ \ Fe ^ I ^ I + 2e - - >Fe ^ 0" align = "absmiddle" class = "latex - formula">

La reacción es balanceada.

<img src="https://tex.z-dn.net/?f=%5C%5C3%29%5C%20I_2%20%2B%20NaOH%20--%3E%20NaI%20%2B%20NaIO_3%2B%20H_2O%5C%5C%20%5C%5C%20I_2%5E0%20%2B2e--%3E2I%5E-%5EI%5C%20%5C%20%5C%20%5C%20%5C%20%5C%20%2F%5Ccdot%205%5C%5C%20I_2%5E0%20%2B10e%20--%3E2I%5EV%5C%5C%20%5C%5C%206I_2%2B12NaOH--%3E10NaI%2B2NaIO_3%2B6H_2O" /> NaI + NaIO_3 + H_2O \ \ \ \ I_2 ^ 0 + 2e - - >2I ^ - ^ I \ \ \ \ \ \ / \ cdot 5 \ \ I_2 ^ 0 + 10e - - >2I ^ V \ \ \ \ 6I_2 + 12NaOH - - >10NaI + 2NaIO_3 + 6H_2O" alt = " \ \ 3) \ I_2 + NaOH - - > NaI + NaIO_3 + H_2O \ \ \ \ I_2 ^ 0 + 2e - - >2I ^ - ^ I \ \ \ \ \ \ / \ cdot 5 \ \ I_2 ^ 0 + 10e - - >2I ^ V \ \ \ \ 6I_2 + 12NaOH - - >10NaI + 2NaIO_3 + 6H_2O" align = "absmiddle" class = "latex - formula">.