148735
Description
Flashcards by eimearkelly3, updated more than 1 year ago
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Created by eimearkelly3
almost 11 years ago
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| Question | Answer |
| 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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