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639186
Electrochemistry- Term 1, Year 12
Descrição
Chemistry (Electrochemistry - Term 1) Mapa Mental sobre Electrochemistry- Term 1, Year 12, criado por Valerie Shepherd em 16-03-2014.
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chemistry
chemistry
electrochemistry - term 1
Mapa Mental por
Valerie Shepherd
, atualizado more than 1 year ago
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Criado por
Valerie Shepherd
mais de 10 anos atrás
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Resumo de Recurso
Electrochemistry- Term 1, Year 12
Electricity
The flow of electrons
Measured in Volts
Electron transfer reactions/Redox
Oxidation
Loss of electrons
Oxidising agent
Electron acceptor
Is reduced
Reduction
Gain of electrons
Reducing agent
Electron donor
Is oxidised
Oxidation Numbers
1. Element = 0
2. Monoatomic ion = 0
3. Oxygen -2, peroxide -1
4. Hydrogen +1, metal hydride -1
5. Sum ON compound = 0
6. Sum ON polyatmoic ion = charge
Increase indicates loss of electrons
Decrease indicates gain of electrons
Balancing Redox Equations
Oxidation Number Change Method
The Half Reaction Method
Acidic solution
Basic solution
Galvanic/Voltaic Cell
Salt bridge
KCl - Potassium Chloride
Electrodes
Anode
Cathode
Electrolyte
Cell Potential
Also called ElectroMotive Force (emf)
Ecell = Reduction Potential + Oxidation Potential
Calculated under standard conditions
25 degrees Celsius
1 atm of pressure for all gases
1M concentration for all ions
Corrosion
Rusting - Iron
1. Iron atoms to Iron (II) ions
2. Iron (II) ions to Iron (III) ions
Loss of electrons
Dry corrosion
Wet corrosion
Preventatives
Physical Protection
Paint
Oil or grease
Plastic coating
Tin plating
Galvanising
Electroplating
Cathodic Protection
Chemical Protection
Sacrificial Protection
Alloying
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