GCSE Chemistry

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ghoran
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145653
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GCSE Chemistry
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2012-04-04 08:28:19
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  1. many metal ores are oxides , so for these metals they can be extracted chemically by displacement by carbon . we react the ore with carbon , the carbon combines with the oxygen from the ore to form ..... ....... the carbon is ..... . this is an ...... reaction .
    the metal oxide ore had its oxygen taken away . the metal oxide is reduced to the metal only . this process is called ..... . .... is the chemical opposite of ..... , so the two reactions always go together
    • carbon dioxide
    • oxidised
    • oxidation
    • reduction
    • reduction
    • oxidation
  2. the position of the metal in th reactivity series determnines whether the metal can be extracted by reduction with carboon . Metals .... than carbon in the reactivity series have to be extracted using ...... which is .... . metals .... the carbon in the reactivty series can be extracted by ..... using .... . for example iron oxide is ... in a .... .... to make iron . this is because carbon can only take the oxygen away from metals which are .... reactive than carbon itself
    • higher
    • electrolysis
    • expensive
    • lower
    • reduction
    • carbon
    • reduced
    • blast furnance
    • less
  3. metals that are more reactive than carbon have to be extracted using electrolysis of ..... .. , an example of a metal that has to be extracted this way is aluminium
    molten compounds
  4. electrolysis much more expensive than reduction with carbon because it uses a lot of ....
    energy
  5. why is aluminium so expensive
    because a high temperature is needed to melt aluminium oxide so that aluminium can be extracted , this requires a lot of energy which makes it an expensive process
  6. copper is .... by ....
    • purified
    • electrolysis
  7. copper can easily be extracted by .... with .... . the ore is .... in a .... this is is called .... . however the copper produced this way is .... - and .... copper doesnt ...... ..... well . this isnt very useful as a lot of copper is used to make ...... ..... . so .... is also used to .... it , even though its quite expensive . this produces very pure copper , which is a much better ..... . you could extract copper straight from its ore by ..... if youn wanted to but it's much more expensive than using ..... with ....
    • reduction
    • carbon
    • heated
    • furnace
    • smelting
    • impure
    • impure
    • conduct
    • electrcity
    • electrical
    • wiring
    • electrolysis
    • purify
    • conductor
    • electrolysis
    • reduction
    • carbon
  8. electrolysis is the .... ... of a substance using ..... .
    it requires a .... to .... the electricty called the ....
    .... are often .... ... ... made from the ore or molten metal oxides
    the .... has .... ... - these conduct the elctricity and allow the whole thing to work
    electrons are .... ... by the .... ... and ..... ... by the ..... .......
    as ions gain or lose electrons they become atoms or molecules and are released
    • breaking down
    • electricity
    • liquid
    • conduct
    • electrolyte
    • electrolytes
    • metal salt solutions
    • electrolyte
    • free ions
    • taken away
    • + anode
    • given away
    • - cathode
  9. how is electrolysis used to get copper
    • electrons are pulled off copper atoms at the anode , causing them to go into solution as Cu2+ ions
    • Cu2+ ions near the cathode gain electrons and turn back into copper atoms
    • the impurities are dropped at the anode as sludge , whilst pure atosm bond to the cathode
  10. you can extarct copper from a solution using a ...... reaction
    displacement
  11. more reactive metals react ..... ... than less reactive metals . if you put a reactive metal into a solution of a dissolved metal compound , the ... metal will .... the .... reactive metal in the compound , this is because the more reactive metal bonds ..... .... to the non metal bit of the compound and .... .... the ..... reactive metal
    • more vigorously
    • more
    • replace
    • less
    • more strongly
    • pushes out
    • less
  12. ... ... can be used to displace copper from a solution - this is very useful because ..... is .... but coper is ..... if .... is put in a sloution of copper sulphate the ..... displaces the ...... ...... the word equation is --------------------------------------
    • scarp iron
    • iron
    • cheap
    • expensive
    • iron
    • iron
    • copper sulphate
    • copper sulphate + iron ===> iron sulphate + copper
  13. copper rich ores are in ..... ...
    short supply
  14. the supply of copper rich ores is ... so its important we .... as much copper as possible
    • limited
    • recycle
  15. the demand for copper is .... and this may lead to .... in the future . scientists are looking for new ways of extracting copper from ... ..... ... or from the waste that is currently produced when copper is extracted . examples of new methods to extract copper are ..... and ......
    • growing
    • shortages
    • low grade ores
    • bioloeaching
    • phytomining
  16. explain bioleaching
    this uses bacteria to seperate copper from copper sulphide . the bacteria get energy from the bond between copper and sulphur seperating out the copper from the ore in the process . the leachate contains copper , which can be extracted , for example by filtering
  17. explain phytomining
    this involvces growing palnts in soil that contains copper , the planst cant use or get rid of the copper , so it gradually builds up in th leaves . the plants can be hearvested dried and burned in a furnace . the copper can be collected from the ash left in the furnace
  18. use a flow chart os how how phtoming produces a metal pan and draw an arrow to show how we can reycle scrap metal
  19. traditional methods of copper mining are pretty ..... to the ..... . These new metahods hve a much ..... ...... but the disadavanmtage is they are ....
    • damaging
    • environment
    • smaller impact
    • slow
  20. metals are very useful . Just imagine if all knives and froks were made out of plastic instead - there'd be prongs snapping all over the place at dinner time . However , metal extraction uses a lot of ...... and is ..... for the ...... . And that's where ...... comes in
    • energy
    • bad
    • environment
    • recycling
  21. people have to balance out the social , economic and environemntal impacts of mining the ores , most of the issues are exactly the same as those to do with quarrying limestone . mining can be good because it means that ..... ..... can be made . It also provides local people with .... and brings ... to the area . This means services such as ...... and .... can be improved , But mining ores is ..... for the ...... as it causes .... , ..... of the ..... and ... of ... . deep mine shafts can also be ..... for a long time after the mien has been abandoned
    • useful
    • products
    • jobs
    • money
    • transport
    • health
    • bad
    • environemnt
    • noise
    • scarring
    • landscape
    • loss
    • habitat
    • dangerous
  22. mining is important for many reasons Mining and extracting metals takes a lot of .... most of which comes from ..... .... ... . ...... ... are .... ... , so its importrant to ... them . Not only this , but burning them contributes to ..... .. , ...... ... and ..... .... . recycling metals only uses a .... ... of the energy needed to mine and extract a new metal . for example copper only takes ....% of the energy thats needed to mine and extract new copper . energy doesnt come cheap so recycling saves .... too . also thier is a ..... amount of each metal in the earth . recycling ...... these resources . recycling metal also cuts down the amount of ... that gets sent to .... . ..... takes up .... and .... the surroundings . if all the aluminium cans in the UK were recycled it is estimated that there'd be ...... million fewer dustbins to empty every year , which means there would be less ...... of rubbish , meaning there wouldnt be as much ..... from lorries
    • energy
    • bruning fossil fuels
    • conserve
    • acid rain
    • global dimming
    • climate change
    • small fraction
    • 15%
    • money
    • finite
    • conserves
    • rubbish
    • landfill
    • landfill
    • space
    • pollutes
    • 14
    • transporting
    • pollution

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