Chemistry · BGCSE / Formulae, equations and moles

StructuredPast exam questionForm 5 · BGCSE

The compound borazine was first made over 90 years ago. It was thought to have the structure shown (a six-membered ring of alternating B and N atoms, each bonded to one H).

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  1. aWhat is the molecular formula and the empirical formula of borazine? [2]
  2. bIf the structural formula is correct, what will be the number of bonding electrons around one nitrogen atom in the molecule of borazine? [1]
  3. cLiquid borazine reacts with water to form ammonia, hydrogen and an aqueous solution of boric acid, H₃BO₃. Construct a balanced equation for this reaction, including state symbols. [2]

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Source: BEC BGCSE Chemistry 2008, Paper 3, Question 2(a)
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