Chemistry, 02.09.2019 22:10 dbn4everloved8

Balance each of the following equations according to the half- reaction method:
(a) mno4- + no2- --> mno2 + no3- (in base)
(b) mno42- --> mno4- +mno2 (in base)
(c) br2 + so2 --> br- + so42- (in acid)

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Answer from: sun64

Explanation :

Redox reaction or Oxidation-reduction reaction : It is defined as the reaction in which the oxidation and reduction reaction takes place simultaneously.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases. Or we can say that in oxidation, the loss of electrons takes place.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases. Or we can say that in reduction, the gain of electrons takes place.

(a) The given chemical reaction is :

$MnO_4^-+NO_2^-\rightarrow MnO_2+NO_3^-$

The oxidation-reduction half reaction will be :

Oxidation : $NO_2^-+2OH^-\rightarrow NO_3^-+H_2O+2e^-$

Reduction : $MnO_4^-+2H_2O+3e^-\rightarrow MnO_2+4OH^-$

In order to balance the electrons, we multiply the oxidation reaction by 3 and reduction reaction by 2 then added both equation, we get the balanced redox reaction.

The balanced chemical equation in a basic solution will be,

$2MnO_4^-+2H_2O+3NO_2^-\rightarrow 3MnO_2+6OH^-+2NO_3^-$

(b) The given chemical reaction is :

$MnO_4^{2-}\rightarrow MnO_4^-+MnO_2$

The oxidation-reduction half reaction will be :

Oxidation : $MnO_4^{2-}\rightarrow MnO_4^-+1e^-$

Reduction : $MnO_4^{2-}+2H_2O+2e^-\rightarrow MnO_2+4OH^-$

In order to balance the electrons, we multiply the oxidation reaction by 2 and then added both equation, we get the balanced redox reaction.

The balanced chemical equation in a basic solution will be,

$2MnO_4^{2-}+MnO_4^{2-}+2H_2O\rightarrow 2MnO_4^-+MnO_2+4OH^-$

$Br_2+SO_2\rightarrow Br^-+SO_4^{2-}$

The oxidation-reduction half reaction will be :

Oxidation : $SO_2+2H_2O\rightarrow SO_4^{2-}+4H^++2e^-$

Reduction : $Br_2+2e^-\rightarrow 2Br^-$

The electrons in oxidation and reduction reaction are same. Now add both the equation, we get the balanced redox reaction.

The balanced chemical equation in a acidic solution will be,

$Br_2+SO_2+2H_2O\rightarrow 2Br^-+SO_4^{2-}+4H^+$

Answer from: Quest

yes, water is wet, just as it makes other things wet, it is wet itself, kinda like ice, when ice is in water, the ice makes water cold, and ice is cold, therefore with that example, water is wet

Answer from: Quest

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

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