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4 marksGroup II Elements

CAPE Chemistry Unit 1 · May/June 2025 · Paper 2 · Question 3(d)(i)

Precipitation reactions of Group II cations with sodium sulfate.

Complete the table below by recording the observations that would be made when a 1 molar (M) solution of sodium sulfate is added to 0.1 mol dm^-3 of each of the Group II cations (Mg2+, Ca2+, Sr2+, Ba2+).

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  1. 3(a)(i)Describe the trend in EACH of the following: Electrical conductivity from silicon to lead [2 marks] The melting point from silicon to lead [2 marks][4 marks]
  2. 3(a)(ii)Account for the variation in melting points from C(d) to Sn, in terms of structure and bonding.[4 marks]
  3. 3(b)(i)Describe the reaction of lead (IV) chloride with water.[1 mark]
  4. 3(b)(ii)Write a balanced equation for the reaction described in (b)(i).[2 marks]
  5. 3(c)(i)State the trend in EACH of the following from beryllium to barium: Density [1 mark] Atomic radii [1 mark][2 marks]
  6. 3(c)(ii)Account for the trend in the atomic radii in terms of the nuclear charge and the screening effect.[3 marks]
  7. 3(d)(ii)Account for the observations in (d)(i).[4 marks]
  8. 3(d)(iii)Write the ionic equation for the reaction between the barium ion, Ba2+ and the 1 M sodium sulfate solution.[2 marks]
  9. 3(e)For any TWO of the metals, complete the following table by naming ONE compound of the metal and the use of the compound.[4 marks]

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