Superconductors and transition metals

Summary from the CGP book...very informative!!!

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  • Created by: Pinkypops
  • Created on: 22-12-10 19:00

Superconductors...

  • Normally most metals have electrical resistance which means that whenever electricity flows through them they will heat up...therefore, wasting electrical energy (as heat).
  • But if you make some of the metals cold they lose this property and become superconductors.
  • This means none of the electrical energy is wasted through heat.
  • One can easily start a current flow through a superconducting circuit where when you take off the battery the current flow on forever.
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Advantages and disadvantages

Advantages

  • Using superconducting wires you can make power cables that transmit electricity without losing it.
  • Strong electromagnets
  • Electronic circuits

Disadvantges

  • It is hard and expensive to get a metal cold as -265 C
  • Scientists have a long way to go to find a metal or a metal oxide less than -135 C. But, yes research is going on...
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Transition metals

 

(http://www.bbc.co.uk/schools/gcsebitesize/science/images/6_the_transition_metals.gif)

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Transition metals

They are found in the middle of the periodic table.

They have properties which are similar to metal properties.

Examples of transition metals: copper, zinc, gold, silver, platinum...

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Transition metals and compounds

Transition metals and compounds make good catalysts

For example

  • Iron is the catalyst used in the haber process for making ammonia.
  • Nickel is useful for the hydrogenation of alkenes...(to make margarine).
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Colorful compounds

Iron (II) compounds are light green

Iron (III) compounds are orange/ brown

Copper compounds are often blue.

They are colourful because of the transition metal ion that it contains.

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Comments

bek

too informative, more words of summary than in my book !!!!!

Pinkypops

bek wrote:

Thats a gud thing isn't?

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