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CIE Nov 2013 v3 Paper 4 Q1
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![Examiners For Use Section A Answer all the questions in the spaces provided. (a) The nitrate ion, NO3 , contains a dative covalent bond. Complete the following dot-and-cross diagram of the bonding in the nitrate ion. For each of the four atoms show all the electrons in its outer shell. Three electrons have already been included. Use the following code for your electrons.electrons from oxygen x electrons from nitrogenadded electron(s) responsible for the overall negative charge [3] (b) (i) Write an equation showing the action of heat on magnesium nitrate, Mg(NO3)2.(ii) Describe and explain the trend that is observed in the thermal stabilities of the Group II nitrates.[4] (c) When concentrated nitric acid, HNO3, is added to copper turnings, a brown gas is evolved. Use data from the Data Booklet to construct an ionic equation for this reaction.[2] [Total: 9]UCLES 2013 9701/43/O/N/13<br />](https://learnah.org/wp-content/uploads/2018/08/November_2013_v3_QP_-_Paper_4_CIE_Chemistry_A-level_1.jpg)
![Page 2 Mark Scheme Syllabus Paper GCE A LEVELOctober/November 2013 9701 43 (a) dative bond to an oxygen using two N electrons 8 electrons around N in 1 double + 2 single bonds a total of 24 electrons, including one, and only one "(cid:0)" (the extra electron, "(cid:0)", can be in a bond or a lone pair) (b) (i) 2Mg(NO3)22MgO + 4NO2 + O2 (ii) (down the group) nitrates become more stable or are more difficult to decompose or need a higher temperature to decompose because there is less polarisation of the anion / nitrate ion / NO bonds as radius of M 2+ / metal ion increases or charge density of the cation decreases [1] [1] [1] [3] [1] [1] [1] [1] [4] (c) Cu + 4H + 2NO3Cu + 2NO2 + 2H2O 2+ species [1] balancing [1] [2] [Total: 9]Cambridge International Examinations 2013<br />](https://learnah.org/wp-content/uploads/2018/08/November_2013_v3_MS_-_Paper_4_CIE_Chemistry_A-level_1.jpg)