CIE Nov 2016 v3 Paper 4 Q2

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PMT (a) When copper(II) carbonate is heated strongly, it decomposes in a similar way to Group 2 carbonates. Predict what would be observed when anhydrous copper(II) carbonate is heated.[1] (b) Describe and explain how the thermal stability of the Group 2 carbonates varies down the group.[3] (c) Calcium cyanamide, CaCN2, can be used as a fertiliser. (i) Complete the dot-and-cross diagram for the cyanamide ion, CN2 2. Use the following key for the electrons.electrons from carbonelectrons from nitrogenadded electron(s) responsible for the overall negative charge 2 (ii) CaCN2 decomposes readily on contact with water forming an insoluble white solid and ammonia only. Suggest an equation for this reaction.[2] [2]UCLES 2016 9701/43/O/N/16 [Total: 8] [Turn over<br />

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