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2 marksStructure and Bonding

CSEC Chemistry · January 2021 · Paper 2 · Question 2(a)(ii)

R and S are two allotropes of carbon. R is a black flaky opaque solid (melting point 3925 °C), while S is a reflective, colourless solid (melting point 3823 °C).

Identify the names of R and S.

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Other parts of this question

  1. 2(a)(i)Define the term 'allotrope'.[1 mark]
  2. 2(a)(iii)State whether R is an ionic, simple covalent or giant covalent structure.[1 mark]
  3. 2(a)(iv)Sketch the structure of R using solid lines (—) for strong bonds and dotted lines (••••••) for weak bonds.[3 marks]
  4. 2(a)(v)Explain why R conducts electricity but S does not conduct electricity.[2 marks]
  5. 2(b)(i)Deduce the type of bonding present in Solid T.[1 mark]
  6. 2(b)(ii)State the appearance that Solid T is expected to have.[1 mark]
  7. 2(c)(i)Compare the arrangement of particles in solids with the arrangement of particles in liquids.[2 marks]
  8. 2(c)(ii)State the process that occurs when solid iodine is heated to form a purple gas, and give ONE other example of a compound that undergoes the same process.[2 marks]

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