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What is Electrochemistry?

Electrochemistry is the  branch of study of electricity and it explains the  relation  to chemical reactions. In  this branch , electricity is  generated by movements of electrons from one element to another in a reaction known as redox reaction or  oxidation-reduction reaction.

 

The Law of Faraday:

The amount of substance produced at each electrode is directly proportional to the amount of charge flowing through the cell, according to Faraday's law of electrolysis. 
Of course, this is a simplified version of the situation. Substances having differing electron/atom or ion oxidation/reduction changes will not be created in the same molar amounts. When those additional ratios are taken into account, however, the law is always correct.

 

Equation of Nernst:

Under non-standard settings, the Nernst Equation can be used to determine cell potential. It connects the observed cell potential to the reaction quotient, allowing for precise equilibrium constant determination (including solubility constants).

 

Non Nernst's Equation:

Cells with conventional cell potentials have all dissolved compounds at unit activity, which translates to an "effective concentration" of 1 M. Similarly, any gases involved in an electrode reaction are at 1 atm effective pressure.

 

Electrochemistry Sample Questions:

Question  1: Electricity is generated  by the  movement of ___________.

(a) Atoms

(b) Ions

(c) Electrons

(d) Protons


Solution: Electricity is  generated by movements of electrons from one element to another in a reaction.

Answer: (c)

 

Question 2: Redox reaction is the simultaneous process of __________.

(a) Oxidation

(b) Reduction

(c) Chemical decomposition

(d) Both a and b


Solution: Electricity is  generated by movements of electrons from one element to another in a reaction known as redox reaction or  oxidation-reduction reaction.

Answer: (d)

 

Question 3: The reaction in which loss of  electrons takes place ___________.

(a) Oxidation

(b) Reduction

(c) Chemical decomposition

(d) Both a and b


Solution : The reaction in which loss of electrons takes place  is called Oxidation.

Answer : (a)

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