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

The chemical bubbles

Answer from: Quest

Firstly, the water in the dams hold gravitational potential energy as they are above ground level. the gravitational potential energy is then transferred to kinetic energy as it falls, spinning the turbinethe turbine then spins the generator, which is a large magnet surrounded by metal coils. by doing this, the generator generates electricity. in this action, the energy transfer taken place is kinetic to electric energy

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Balance each of the following equations according to the half- reaction method:
(a) mno4- + n...