CHEMICAL CHANGES

 ELECTROCHEMICAL REACTION - ELECTROPLATING AND IT'S USES 

LEARNING OUTCOMES 

• Able to define electrochemical reaction.

• Understand application of electrochemical reactions.

• Able to define electroplating. 

• Comprehend different uses of electroplating. 

NOTE

Electrochemical reaction

                                        An electrochemical reaction is the chemical reaction in which electrical energy is consumed or produced. 

Electroplating

                             Electroplating is an electrochemical reaction. Electricity is used to obtain a thin coating of a particular metal on other metallic objects. This process is known as electroplating.  

How it works

                         Silver rod is connected to the anode (+ve charged electrode) of the circuit and a iron ring is kept at the cathode (-ve charged electrode). Both are kept immersed in a solution. Then, a current is supplied to the anode that oxidizes the silver atoms and dissolves them into the solution. The dissolved ions of silver are reduced at the cathode and plated on the jewelry. Hence, the iron ring gets covered with a thin layer of silver metal.

(Click on the image to see the video)

Uses of electroplating 

• Gold covered ornaments. 

• To prevent corrosion. 

Endoergic and exoergic reactions

                          Forms of energy like heat, light, and electricity are exchanged during chemical reactions. Those chemical reactions which absorb energy is called endoergic reactions. Those chemical reactions which involve liberation of energy is called exoergic reactions.

IMAGES OF ELECTROPLATING

(Click on the image to view the video)

(Click on the image to view the video)

VIDEO OF ELECTROPLATING

POWERPOINT PRESENTATION

MY YOUTUBE VIDEO ON ELECTROPLATING 

CONCLUSION

              Electroplating is one of the electrochemical reaction. It is the coating of one thin layer of metal on another metal. If copper is to be coated,copper sulphate solution has to be used in which copper rod has to be dipped in it along with the rod on which copper has to be deposited. The electrolyte is taken depending on the metal which has to be deposited.

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