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CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity

The Periodic Table: chemical periodicity: compare question

Compare5 marksStandard

Phosphorus(V) chloride, PClX5\ce{PCl5}, reacts vigorously with water to form two acids.

Compare the reaction of PClX5\ce{PCl5} with water with the reactions of NaCl\ce{NaCl} and MgClX2\ce{MgCl2} with water.

In your answer include:

  • the equation for the reaction of PClX5\ce{PCl5} with water
  • the pH of each solution formed
  • an explanation of the different behaviour, in terms of bonding and electronegativity.
0 words · 5 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.

Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.

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