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Chemical Cell
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A simple chemical cell
Is made up of two different metals immersed in an electrolyte and connected to an external circuit with connecting wires
Example of a simple chemical cell
Electrochemical series showing arrangement of ions in order of electropositivity
Chemical reactions in a chemical cell with different metal electrodes (Mg becomes the -ve terminal and Cu becomes the +ve terminal) (1)
Mg which donates electrons forms Mg ions and dissolves in the electrolyte (Cu(II) sulphate solution)
Chemical reactions in a chemical cell with different metal electrodes (Mg becomes the -ve terminal and Cu becomes the +ve terminal) (2)
Mg acts as the negative terminal of the chemical cell
Chemical reactions in a chemical cell with different metal electrodes (Mg becomes the -ve terminal and Cu becomes the +ve terminal) (3)
The released electrons will flow through the external circuit from Mg to Cu which acts as the positive terminal of the chemical cell
Chemical reactions in a chemical cell with different metal electrodes (Mg becomes the -ve terminal and Cu becomes the +ve terminal) (4)
Electrons from Mg are received by the Cu(II) ion from the electrolyte and not by the H ion because the Cu(II) ion is less electropositive than the H ion
Chemical reactions in a chemical cell with different metal electrodes (Mg becomes the -ve terminal and Cu becomes the +ve terminal) (5)
Solid Cu is formed and deposited on the Cu strip
Chemical reactions in a chemical cell with different metal electrodes (Mg becomes the -ve terminal and Cu becomes the +ve terminal) (6)
Cu acts as the positive terminal of the chemical cell
Chemical reactions in a chemical cell with different metal electrodes
The flow of electrons from the negative terminal to the positive terminal through the external circuit will produce electrical energy
The views expressed in the flashcard here are those of the contributor and don’t necessarily represent the views of Pandai
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