AQA Specimen Paper 1 Q2 (with explained solutions) |

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AQA Specimen Paper 1 Q2

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Explain why the atomic radii of the elements decrease across Period 3 from sodium to chlorine. [2 marks] Explain why the melting point of sulfur (S8) is greater than that of phosphorus (P4). [2 marks] Explain why sodium oxide forms an alkaline solution when it reacts with water. [2 marks] . 1 0 2 . 2 0 2 . 3 0 2 Barcode Typesetter code<br />
. 4 0 2 Write an ionic equation for the reaction of phosphorus(V) oxide with an excess of sodium hydroxide solution. [1 mark] Turn over for the next question Barcode Typesetter code Turn over <br />

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Question Marking guidance 02.1 The number of protons increases (across the period) / nuclear charge increases Therefore, the attraction between the nucleus and electrons increases S8 molecules are bigger than P4 molecules Therefore, van der Waals / dispersion / London forces between molecules are stronger in sulfur Sodium oxide contains O2 ions These O2 ions react with water forming OH ions P4O10 + 12OH 4PO4 3 + 6H2O 02.2 02.3 02.4 MARK SCHEMEA-level ChemistrySpecimen paper 1 Mark AO Comments AO1a AO1a AO1a AO1a AO2c AO2c Can only score M2 if M1 is correct Allow sulfur molecules have bigger surface area and sulfur molecules have bigger Mr O2 + H2O 2OH scores M1 and M2 AO2d 1 1 1 1 1 1 4 of 15<br />

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