CAPE Chemistry Unit 1 · 2021 · Paper 2 · Question 3(b)(i)
Account for the difference in oxidation state between vanadium and calcium.
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- 3(a)(i)Complete Table 2 by inserting the missing electronic structure (ES) and the oxidation state (OS) for EACH element listed.[5 marks]
- 3(a)(ii)Explain the difference between the trend of the first ionization energy for the Group II elements and the first row transition elements.[4 marks]
- 3(b)(ii)Comment on the observation that calcium carbonate is more thermally stable than magnesium carbonate.[2 marks]
- 3(c)(i)Explain the observation in terms of the stability constant of the complex ion formed.[3 marks]
- 3(c)(ii)Write a balanced equation for the reaction occurring when concentrated HCl is added to a pink solution of cobalt(II) chloride.[2 marks]
- 3(d)(i)Complete Table 3 to show the observations expected for EACH of the tests on ammonium vanadate.[5 marks]
- 3(d)(ii)Write the formula of the species formed which is responsible for EACH colour observed in (d)(i) in Table 3.[5 marks]
More practice: the rest of this paper · more First Row Transition Elements questions · all CAPE Chemistry Unit 1 past papers