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4 marksGroup VII Elements

CAPE Chemistry Unit 1 · May/June 2026 · Paper 2 · Question 3(b)(iii)

Reactions of halogens with hydrogen.

With reference to the bond energies of the hydrides given in Table 4, explain the relative thermal stabilities of the hydrogen halides.

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Other parts of this question

  1. 3(a)(i)List FOUR properties of transition metals.[4 marks]
  2. 3(a)(ii)Explain the relatively small changes which occur across the series of transition elements in the first ionization energy, Delta H_1E, shown in Table 3.[4 marks]
  3. 3(a)(iii)Compare the atomic radius of calcium with those of the transition elements.[3 marks]
  4. 3(a)(iv)Write the electronic configuration of Cu and Cu2+.[2 marks]
  5. 3(b)(i)Describe the reaction of chlorine with hydrogen and write a balanced chemical equation for the reaction.[4 marks]
  6. 3(b)(ii)Describe the reaction of bromine with hydrogen and write a balanced chemical equation for the reaction.[4 marks]
  7. 3(c)Complete Table 5 by writing the observations based on the deductions written for the cation and anion in Compound S.[5 marks]

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