Paul the anode site come across to the

PaulGabard 2i. Bil 18/01/18 Voltaic and Electrolytic cellsWhat are they?Avoltaic cell is alsoknown as a galvanic cell, it was named/ created by AlessandroVolta (voltaic) and Luigi Galvani (galvanic). It is a type of cellthat makes electrical energy from the chemical reactions that occurinside itself. The chemical reaction that occur inside of the cell isa redox reaction. Examples: batteries inside your TVcontroller, batteries inside flashlight. Examples of types voltaiccells: 1-Alkaline cell 2-Daniell cell 3-Simple cell 4-Lead-acidaccumulator 5-Dry cell.

The fact that a voltaic cell can produce energy/ electricity is byusing Zinc (anode) and Copper (cathode) that are connected by a wireand that are put in a solution: CuSO4. When the wire andthe salt bridge (helps to balance the charges in the galvanic cell,it is composed of Na+Cl- and 2 cotton plugsthat won’t let the solution of Na+Cl- ofpouring into the cathode and anode sites) are there, they will allowelectrons to move through the wire(s) that connect(s) Cu (with astrong pull of electrons) to Zn (with a weak pull of electrons) witha LED between the two. When electrons are in a movement position,they produce or make electricity which will turn the LED on. We said that there was two chemical reactions: reduction andoxidation. The cathode (Cu) part is the site where reduction occursand the anode is where the oxidation occurs. That because theelectrons are moving from Zn to Cu and the Zn2+ that arepresent on the anode site come across to the cathode site and reactwith the Cu2+ to make only Cu ? what happens in theCopper site is a reduction process: Cu2+(aqueous = dissolved in water) + 2e- ? Cu (solid metal)And in the Zinc site is an oxidation process:Zn(solid)? Zn2+ (aqueous) + 2e-Now,these two half cell can be called: the reduction half cell and theoxidation half cell.

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We saw in TP that if you only put 1 Zn and 1 Cu, it won’t provideenough electricity to turn a LED on. So what we did is we took morehalf lemons and connected the 3 Zn and 3 Cu with 4 more wires and itmade the LED turn on with enough electricity that was moving withinthe 4 wires. An electrolytic cell is also happening with redox reaction. It iswhere an electric current will make the transfer of the electrons inthe redox reaction.Difference between a voltaic and electrolyticcell-nosalt bridge in the electrolytic cell-Scheme of them both Electrolytic cell Voltaic cell Bibliography


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