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Ores
getting metals from rocks
| Question | Answer |
|---|---|
| what is a metal ore? | a rock which contains enough metal to make it worthwhile extracting the metal from it |
| how do you extract metals from their ores? | using a chemical reaction |
| a metal can be extracted from its ore chemically by reduction using... | carbon (metal oxide + carbon--> metal + carbon dioxide) |
| what happens when an ore is reduced? | oxygen is removed from it |
| which metals in the reactivity series can be extracted by reduction using carbon? and why? | metals below carbon because carbon can only take the oxygen away from metals which are less reactive than carbon itself is |
| how are metals more reactive than carbon extracted? | electrolysis of molten compounds |
| what can electrolysis also do? | can be used to purify metals, but is expensive |
| what does electrolysis mean? | splitting up with electricity, breaking down a substance with electricity |
| what is an electrolyte? | a liquid to conduct electricity, metal salt solutions made from an ore e.g. copper sulphate |
| how else can you extract copper from a solution? | using a displacement reaction |
| what happens if you put a reactive metal into the solution of a dissolved metal compound? and why? | the reactive metal will replace the less reactive metal in the compound because the more reactive metal bonds more strongly to the non metal bit of the compound and pushes out the less reactive metal e.g copper sulphate + iron --> iron sulphate +copper |
| what happens if a piece of silver metal is put into the solution of copper sulphate? | no reaction because copper is the more reactive metal |
| why is the extraction of aluminium and titanium expensive? | low density thin layer of oxides on their surface which stops air and water getting to the metal so they resist corrosion they cannot be extracted from their oxides by reduction with carbon , this process needs a lot of electrical energy, several stages |
Created by:
rv1
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