Chemical Cell

Science

Question

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

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Chemical Cell

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