O-LevelChemistryBonding & Structure5070/21 · May/June 2021 · Q48 Marks
Copper(II) chloride, copper(II) iodide and copper(II) carbonate are ionic compounds.
- (a)Predict two physical properties, other than electrical conductivity, of copper(II) chloride. 1. 2.[2]
- (b)Copper is a transition element. Suggest one property of copper(II) chloride that is characteristic of a compound of a transition element.[1]
- (c)Copper reacts with chlorine to make copper(II) chloride. Cu + Cl2 → CuCl2 Copper(II) chloride contains Cu2+ and Cl- ions. Explain, in terms of the movement of electrons, how CuCl2 is formed from copper atoms and chlorine molecules.[2]
- (d)Copper(II) iodide decomposes to make iodine and copper(I) iodide. The ionic equation for this reaction is shown. 2Cu2+ + 4I- → 2CuI + I2
- (d)(i)Use the information to explain that oxidation takes place.[1]
- (d)(ii)Use the information to explain that reduction takes place.[1]
- (e)A sample of copper(II) carbonate is heated strongly. Name the products of this reaction.[1]
Mark scheme
Marking points from the official mark scheme (May/June 2021). The mark or mark type is shown in brackets.
- 4(a) Any two from: soluble in water (1)
- 4(a) insoluble in organic solvents (1)
- 4(a) high melting point/solid at room temperature (1)
- 4(b) coloured / forms a blue ppt with NaOH or NH3
- 4(c) copper loses electrons and chlorine gains electrons (1)
- 4(c) reference to (transfer of) two electrons (1)
- 4(d)(i) iodide (ion) loses electrons
- 4(d)(ii) Cu2+ (ion) gains electrons / copper(II) ions gain electrons
- 4(e) copper(II) oxide AND carbon dioxide
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