GCSE Chemistry

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Author:
ghoran
ID:
146515
Filename:
GCSE Chemistry
Updated:
2012-04-09 07:33:32
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metals their uses topic
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Description:
metals
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  1. what are the specific properties of copper
    copper is a good conductor of electricity , so it's ideal for elctrical wires . it's hard and strong but can be bent . it doesnt react with water
  2. what are the specific properties of aluminium
    • silvery , shiny
    • low density
    • good conductor of heat and electricity
    • very easily shaped
    • pure aluminium isnt particuarly strong but it forms had , strong alloys
  3. what are the specific properties of titanium
    • low density
    • strong
    • corrosion resistant
    • very high melting point
    • has an oxide layer
  4. what properties make titanium ideal to use in jet engines and nuclear reactors
    • very high melting point
    • light
    • strong
  5. different metals are chosen for different uses because of thier specific properties for example : if you were doing so plumbing , you pick a metal that could be .... to make pipes and tanks , and is below ..... in the reactivity series so it doesn't ...... with .... . .... is great for this
    • bent
    • hydrogen
    • react
    • water
    • copper
  6. different metals are chosen for different uses because of thier specific properties for example : if you wanted to make an areoplane , you probably use a metal as it's ... and can be easily .... into ... . but you'd also need it to be .... , so ..... would be a good choice
    • strong
    • bent
    • shape
    • light
    • aluminium
  7. different metals are chosen for different uses because of thier specific properties for example : if you were making hip replacements , you'd pick a metal that .... ... when it comes in contact with ... . it'd also have to be .... too and not too .... . .... has all of these properties so it's used for this
    • won't corrode
    • water
    • light
    • bendy
    • titanium
  8. when deciding which metal to make something out of we have to look at its properties , we can alter the properties of a metal by combining other atoms with it we call this an alloy . if we want a metal that is strong , light and does not corrode often titanium and aluminiun is used . Both of these materials do not corrode but why ?
    both of these materials will not corrode , because although the metals themselves are reactive , they readily react with oxygen atoms in the air and so an oxide layer is formed on the surface of the metal , this forms titanium oxide and aluminum oxide respectively .this means that acid neither water nor oxygen can get to the metal atoms , so it canot react with them , making the metals corrosion resistant
  9. transition metals are typical metals . thier properties therefor include :
    • high melting points and high densities
    • good conductors of both heat and electricity
    • strong and shiny
    • malleable and ductile
  10. transition metals are typical metals . thier properties therefor include :
    high melting points and high densities
    good conductors of both heat and electricity
    strong and shiny
    malleable and ductile
    these properties mean that they are useful as :
    • structural materials
    • and they are useful for maing things that must allow heat or electricity to pass through them easily
  11. what properties of titanium make it particuarly useful for making artificial joints
    • light
    • unreactive , so wont react with chemicals in your body
  12. why is aluminium used for overhead cables
    because it is light and conducts electricity
  13. aluminium has a high reactivity but is corrosion resitant
    why ?????
    because it has a protective layer of aluminium oxide on top of it . this layer forms because aluminium is so reactive that it reacts with the oxygen in the air . this means that acid neither water nor oxygen can get to the aluminium atoms , so it cannot react with them
  14. give two properties of titanium that makes it more useful than steel for hip replacement joints
    • it is 45% lighter than steel
    • less dense
  15. in th reactos magnesium is used to produce titanium . if carbon were used instead of magnesium no titanium would be produced . what does this tell us about the relative reactivities of carbon , magnesium and titanium
    • magnesium is more reactive than titanium
    • magnesium and titanium are more reactive than carbon
  16. most titanium is produce from its ore , titanium oxide , by a batch process that takes 17 days

    titanium reactors produce about 1 tonne of the metal per day . iron blast furnaaces produce 20000 tonnes of the metal per hour
    the use of titanium is limited because it is expensive , explain why titanium costs more than iron
    • titanium extraction takes a long time whereas iron extraction doesnt take as long
    • there is a low abundance of titanium ore wheareas iron is the second most common metal in th earths crust
    • titanium extraction is more labour intensive than iron extraction
    • per tonne of titanium more energy is needed for extraction than iron
    • iron can be extracted using carbon which is cheap
    • wheareas titanium has to be extracted using chlorine and magnesium which is expensive
    • titanium is a batch process whereas iron is a continuos process

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