OCR A Jun 2016 Paper 1 Q1

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Answer all the questions. 1 Nitrogen is the most common gas in the atmosphere. (a) Atoms of nitrogen consist of protons, neutrons and electrons. Complete the table below. Particle Relative mass Relative charge Position within the atom Proton Neutron Electron shell [2] (b) The electrons in the second shell of a nitrogen atom are found in an s-orbital and three p-orbitals. (i) State, in words, the 3D shape of an s-orbital and a p-orbital. s-orbitalp-orbital[1] (ii) Describe the relative energies of the 2s orbital and each of the three 2p orbitals in a nitrogen atom.[2] (c) Draw a dot-and-cross diagram to show the bonding in a nitrogen molecule. Show outer electrons only.OCR 2016 [1]<br />
 (d) Calculate the amount, in mol, of nitrogen atoms in 5.1171020 nitrogen molecules. Give your answer in standard form. amount of nitrogen atoms =mol [2] (e) N2O3 is an unstable oxide of nitrogen that decomposes in a redox reaction. (i) State the oxidation number of nitrogen in each oxide in the table below. N2O3(g) NO(g) + NO2(g) Oxidation number of nitrogen Oxide N2O3 NO NO2 [1] (ii) Name this type of redox reaction. In your answer you should use appropriate technical terms spelled correctly.[1] (f) N2O3 reacts with water to form an acid as the only product. This reaction is not a redox reaction. The empirical formula of the acid formed is the same as the molecular formula. (i) State what is meant by the term molecular formula.[1] (ii) Suggest the empirical formula of the acid formed.OCR 2016 empirical formula of acid =[1] [Total: 12] Turn over<br />

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