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18 Cards in this Set
- Front
- Back
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What is an Ore? |
A metal compound within a Rock is an ore. |
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Explain why it is possible to find gold in the Earth as a metal |
Because it is very unreactive |
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What does the reactivity series show us? |
The relative reactivity of certain metal and non metal elements |
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metals in the reactivity series |
Potassium Sodium Calcium Magnesium Alminium
Zinc Iron Lead Copper Silver Gold |
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where is carbon in the reactivity series? |
between aluminium and zinc |
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Describe the two ways copper is extracted from copper rich ores |
1. smelting: 80% of copper is produced this way. Heat copper ore in a furnace wiht air. Then use electrolysis to purify the copper. 2. Copper Sulphate: Add sulphuric acid to a copper ore. Produces copper sulphate. Extract copper using electrolysis or displacement. |
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what is electrolysis? |
In a solution or molten compound when elecricity is passed through its positvie metal ions and moves towards negative electrode. Negative non-metal ions move towards the positive electrode. |
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What is Phytomining? |
Phytomining: Plants absorb copper ions from low-grade ore. Plants are burned. Copper ions dissolved by adding acid. Use displacement or electrolysis to extract pure Copper. |
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what is bioleching? |
Bioleaching: Bacteria feed on low-grade ore produce a waste product that contains copper ions Use displacement or electrolysis to extract pure copper. |
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Why are these processes important? |
They extract copper from low grade pres that are ot otherwise worth exploiting. |
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How can Carbon be used to extract a metal from its ore? |
Metals below carbon can be extracted by reduction using, coke, or Charcoal |
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what method do we use to extract more reactive metals such as aluminium? |
Electrolysis |
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What methods do we use to extract less reactive metals that carbon? |
Reduction using carbon, coke, or characoal |
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properties and uses of Aluminium |
properties: light, low density, oxide layer on the surface prevents corrosion, improve hardness by forming alloys. These alloys are stronger and rigid then pure Al uses: drink cans, cooking oil, saucepans, overhead cables, aeroplanes |
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why is aluminium expensive? |
Aluminium ore in mind and extracted. Aluminium oxide (the ore) is melted. Electric currect passed through a high temperature expensive process- need lots of heat and electricity. |
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properties of uses of titanium |
Properties: Strong, oxide laer on the surface prevents corrosion, high melting point - so can be used at high temperatures, less dense than most metals Uses: hip replacements, racing bikes, jet englines, parts of nuclear reactors |
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why is titanium expensive? |
Use sodium or potassium to displace titanium from its ore Expensive: lots of steps involved to process and needs lots of heat and electricity. |
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why isit important that we recycle metals? |
reduces the energy needed to extract them and process them as much less energy is needed tp recycle metals than extract from their ore. Less pollution due to less precessing and not as many vehicles needed to transport. Stops the landscape being destroyed and distruption to wildlife an dpeople living near. |
