AQA Jun 2010 Paper 5 Q4

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do not write outside the box a transition elements form complex ions with a range of colours and shapes by considering its electron arrangement state how an element can be classified as a transition element mark b explain the meaning of the term complex ion marks c in terms of electrons explain why an aqueous solution of cobalt ii sulfate has a red colour marks d the ligand edta is shown below o o o o ch n ch ch ch h c n h c o o o o d i draw circles around the atoms of two different elements that link to a transition metal ion by a co ordinate bond when edta behaves as a ligand marks d ii write an equation for the reaction between edta and a co h o ion use the abbreviation edta in your equation mark wmp jun chem do not write outside the box d iii explain why the complex ion formed as a product of the reaction in part d ii is more stable than the co h o ion marks e the diagram below shows part of the structure of haemoglobin fe haemoglobin contains an iron ii ion bonded to five nitrogen atoms and one other ligand the fifth nitrogen atom and the additional ligand are not shown in this diagram e i in this diagram bonds between nitrogen and iron are shown as n fe and as n fe state the meaning of each of these symbols meaning of meaning of marks e ii state the function of haemoglobin in the blood mark e iii with reference to haemoglobin explain why carbon monoxide is toxic marks turn over wmp jun chem

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