CR 6 - Displacement Reactions

CR 6 - Displacement Reactions
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Storyboard Description

Chemical Reactions Key Assessment

Storyboard Text

  • Hello, my name is Potassium. I have come to take your dog!
  • On yes, I will!
  • No!
  • Hi, my name is Zinc. This is my dog, Sulphur, We together form zinc sulphide. Who are you? 
  • Woof!
  • Now, I have your dog!
  • Why?!
  • Hi, my name is Magnesium and this is my cat, Nitride. Together, we are called Magnesium Nitride. Who are you?
  • Oh yes I will!
  • I am Calcium and I have come to steal your dog!
  • No you won't!
  • Here, we can see that Potassium is trying to steal Sulphur the dog from his owner, Zinc. Sadly for Zinc, Sulphur will become Potassium's, in terms of science. The reaction that will take place between potassium (K) and zinc sulphide (ZnS) is known as a displacement reaction. It is whiner a more reactive metal displaces/replaces a less relative metal from it's compound. Using what is known as the reactivity series (the list of metals in order of hows quickly they react), we can see that potassium is more reactive than zinc and is thus, higher than zinc in the reactivity series. In fact, potassium is actually the most reactive metal and is the highest in the reactivity series (highest = most reactive, lowest = least reactive). as it is higher than the metal in the compound (zinc), potassium displaces the zinc from its compound of zinc sulphate. This means that Potassium will get the dog (Sulphur) while Zinc becomes very lonely!
  • Yes! I now have your dog!
  • Why?!
  • In this case, we can see that the reaction between the reactants of potassium and zinc sulphide is complete, creating the products of zinc and potassium sulphide. The word equation and symbol equation for this reaction is: potassium + zinc sulphide potassium sulphide + zinc K + ZnS KS + Zn
  • Hi, I am Lead and this is my dog Oxygen, together, we make Lead Oxide! Who are you?
  • No!
  • I am Gold and I have come to steal your dog!
  • In this scenario, we can see that Calcium is trying to steal the dog Nitride from the owner, Magnesium. Unfortunately for Magnesium, this will take place, in scientific terms. In this example of a displacement reaction, we can see that calcium (Ca) is reacting with magnesium nitride (Mg3N2) This is because of the fact that calcium is a the third highest metal in the reactivity series making it higher than magnesium (which is the fourth highest metal in the reactivity series). This means that calcium is more reactive than magnesium, allowing calcium to be able to displace magnesium from its compound of magnesium nitride. This will mean that Magnesium will become very lonely while Calcium gets a new companion.
  • Good, I still have you and she wasn't able to take you.
  • This isn't fair!
  • In this case, we can understand that the reaction between the reactants of calcium and magnesium nitride is complete, creating the products of magnesium and calcium nitride. The word equation and symbol equation for this reaction is: calcium + magnesium nitride calcium nitride + magnesium 3Ca2 + 2Mg3N2 2Ca3N2 + 3Mg2
  • Finally, here we can see that Gold is trying to steal Oxygen the dog from the owner, Lead. Fortunately for Lead, this will not take place in scientific terms. This is because of the fact that gold (second least reactive) is a less reactive metal than lead (fifth least reactive), thus making gold lower than lead in the reactivity series. This means that gold will not be able to displace lead from its compound of lead oxide, meaning that Leads dog, Oxygen cannot be stolen by Gold in scientific terms.
  • In this scenario, we can see that the reactants of gold and lead oxide did not react to create any products as no reaction took place. This can be seen in the fact that no detectable energy changes weer seen during the reaction and that no new substances were formed (seen due to the fact that no change in appearance like colour change took place). This is because of the fact that gold is less reactive than lead, meaning that gold cannot displace lead from the compound of lead oxide. The word equation for the reaction, therefore is: gold + lead oxide 'no raection'
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