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Criado por eimearkelly3
aproximadamente 11 anos atrás
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Questão | Responda |
Oxidation is | The loss of electrons |
Reduction is | The gain of electrons |
Redox reactions involve | The transfer of electrons |
Examples of redox reactions | Respiration The browning of apples Rusting Photsynthesis |
Metals are generally | Oxidised |
Non-metals are generally | Reduced |
An oxidising agent | Is a substance that allows oxidation to happen by gaining electrons itself |
examples of oxidising agents | hydrogen peroxide - stain removal / bleaching agent Oxygen - combustion / respiration |
A reducing agent | A substance that allows reduction to happen by losing electrons itself. |
Examples of reducing agents | Sulfur dioxide - bleaching agent Carbon monoxide - production of emtals from ore |
The electrochemical series is | A series of metals arranged in order of their tendency to be oxidised |
List the electrochemical series | Potassium Calcium Sodium Magnesium Aluminium Zinc Iron Tin Hydrogen Lead Copper |
Application of displacement reactions | The use of a less valuable metal, such as scrap iron to displace a more valuable and less reactive metal, such as copper from a solution of its salts |
Electrolyte | A substance that conducts electricity when dissolved in water or molten e.g. hydrochloric acid, sodium hydroxide, sodium chloride |
Electrolysis | The breaking up of a substance due to the passage of an electric current through it in aqueous solution or when molten |
What occurs at the anode during electrolysis? | Oxidation |
What occurs at the cathode during electrolysis? | Reduction |
Electroplating | A layer of a metal is put onto the surface of another metal e.g. cutlery made of nickel can be coated with silver and is stamped with the letters EPNS (electro-plated nickel silver) |
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