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2 marksFirst Row Transition Elements

CAPE Chemistry Unit 1 · May/June 2019 · Paper 2 · Question 3(d)(iii)

A sequence of reactions involving compounds of cobalt, with ions A, B and C is shown: [Co(OH)4]2-(aq) (Blue) <=> [Co(H2O)6]2+(aq) (B) <=> [Co(NH3)6]2+(aq) (C).

State the colour of the ions B and C.

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Other parts of this question

  1. 3(a)(i)Write the equation, including state symbols, for the first ionization energy of magnesium.[2 marks]
  2. 3(a)(ii)Explain why there is a general increase in the first ionization energies across the period from sodium to argon.[2 marks]
  3. 3(a)(iii)Explain why the first ionization energy of magnesium is greater than that of aluminium.[2 marks]
  4. 3(b)Write a balanced equation to show the reaction between water and EACH of Na2O and SO3.[4 marks]
  5. 3(c)(i)Describe an experimental method with expected results to determine the acid-base nature of the following three Period 3 chlorides: NaCl, MgCl2, and SiCl4.[5 marks]
  6. 3(c)(ii)Write a balanced equation to show the reaction between water and EACH of MgCl2 and SiCl4.[4 marks]
  7. 3(d)(i)Define the term 'transition element'.[1 mark]
  8. 3(d)(ii)List THREE characteristic properties of transition elements other than forming coloured compounds.[3 marks]
  9. 3(d)(iv)Account for the fact that unlike Cu2+ compounds, Zn2+ compounds are normally colourless.[5 marks]

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