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1 markStructure and Formulae

CAPE Chemistry Unit 2 · January 2021 · Paper 2 · Question 2(a)(i)

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

Define the term 'allotrope'.

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Other parts of this question

  1. 2(a)(ii)Identify the names of R and S.[2 marks]
  2. 2(a)(iii)State whether R is an ionic, simple covalent or giant covalent structure.[1 mark]
  3. 2(a)(iv)In the space below, sketch the structure of R, using solid lines (—) to show strong bonds and dotted lines (••••) to show 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)When solid iodine is heated, a purple coloured gas is observed. State the process which occurs and give ONE example of another compound which undergoes the…[2 marks]

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