The diagram shows part of the Periodic Table. Only some of the elements are shown. H C N F Si P S Cl Ti Fe Cu Zn As Br

1. (a)(i)is a simple molecular solid at room temperature and pressure,[1]
2. (a)(ii)oxidises in the presence of water and air to form rust,[1]
3. (a)(iii)has an atom with three occupied electron shells, the outer of which has only 5 electrons,[1]
4. (a)(iv)has an oxide which is amphoteric,[1]
5. (a)(v)has a chloride of type XCl3 whose aqueous solution forms a reddish-brown precipitate on addition of aqueous ammonia,[1]
6. (a)(vi)is a colourless diatomic gas.[1]
7. (b)(i)Arsenic reacts with oxygen to form arsenic(III) oxide, As2O3. Construct the equation for this reaction.[1]
8. (b)(ii)Arsenic(III) oxide is slightly soluble in water. A weak acid, arsenous acid, H3AsO3, is formed. Use kinetic particle theory to explain why a 0.05mol/dm³ solution of arsenous acid reacts much more slowly with magnesium ribbon than a 0.05mol/dm³ solution of hydrochloric acid.[2]

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