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I/GCSE Chemistry- Displacement

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· igcse chemistry

In this I/GCSE Chemistry blog post, we will be looking at the displacement reactions between different elements, let's go!

A More Reactive Metal Displaces a Less Reactive Metal

  • More reactive metals react mroe strongly than less reactive metals
  • This means that a more reactive metal will displace a less reactive metal from it's oxide because it will bond more strongly to the oxygen

Example: iron would be displaced from iron oxide by the more reactive metal aluminium 

Iron oxide + aluminium = almunium oxide + iron

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  • Metal compounds like copper sulfate, zinc chloride and sodium chloride are metal salts.
  • If you put a reactive metal into a solution of a less reactive metal salt the reactive metal will replace the less reactive metal in the salt.
  • Example: put an iron nail in a solution of copper sulfate and the more reactive iron will "kick out" the less reactive copper from the salt. 
  • You end up with iron sulfate solution and copper metal

Copper sulfate + iron = iron sulfate + copper

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If a piece of silver metal is put into a solution of copper sulfate, nothing happens. The more reactive metal (copper) is already in the salt.

  • You can use displacement reactions to work out where in the reactivity series a metal is supposed to go. 
  • For example, if you were given a lump of a mystery metal, you could try reacting it with different metal oxides and salts. 
  • If it reacted with copper oxide you'd know it was higher in the series than copper. 
  • If it didn't react with magnesium sulfate you'd know it was lower than magnesium in the reactivity series  

That's all!

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References:

https://www.google.com/url?sa=i&url=https%3A%2F%2Fbrainstudy.info%2Fimages%2Fthe-chemical-equation-for-oxidation-of-iron&psig=AOvVaw2lagocHt64Et9IpI7eC3QZ&ust=1628741440133000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCMCN0uqMqPICFQAAAAAdAAAAABAD

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DHMqfk3MurYE&psig=AOvVaw0yJLsOcSjEGdVZfsRYHYxW&ust=1628741491005000&source=images&cd=vfe&ved=0CAsQjRxqFwoTCNiWn4eNqPICFQAAAAAdAAAAABAD

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