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9 Cards in this Set
- Front
- Back
What is a displacement reaction |
A redox reaction |
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What does the term redox mean |
Reduction and oxidation happen simultaneously |
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What happens in a displacement reaction |
A more reactive element reacts to take the place of a less reactive element in a compound the more reactive metal is oxidised and less reactive metal is reduced |
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What is the metal ore |
A rock which contains enough metal to make it economically worthwhile extracting the metal from it |
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How can some metals be extracted by reduction with carbon |
Metals below carbon in the reactivity series can be extracted by reduction using carbon because carbon can only take the oxygen away from metals which are less reactive than itself |
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How do you extract metals that are more reactive than carbon |
Using electrolysis of molten compounds the metal or is melted and electrical current is passed through it the metal is this charge at the cathode and the non-metal at the anode |
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What are the disadvantages of electrolysis as a method of extracting metals compare to reduction with carbon |
Electrolysis is more expensive as needs electricity and can be expensive to melt or dissolve the metal ore |
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What are the biological methods to extract metals |
Bioleaching uses bacteria to separate metals from there ores bacteria get energy from the bonds between the atoms separating out the metal from the in the process the leachate (The solution produced by the process) contains metal ions which can be extracted with a more reactive metal |
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What is another method of biologically extracting metals |
Phytoextraction growing plants and soil that contains metal compounds metals gradually build up in the leaves plants can be harvested dried and burned in furnace the ashes contain metal compounds from which the metal committee extracted by electrolysis or displacement reactions |