AQA Jan 2012 Paper 5 Q8 (with explained solutions) |

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AQA Jan 2012 Paper 5 Q8

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do not write outside the box in its reactions with transition metal ions ammonia can act as a br nsted lowry base and as a lewis base a define the term lewis base mark b write an equation for a reaction between aqueous copper ii ions cu h o and ammonia in which ammonia acts as a br nsted lowry base state what you would observe marks extra space c write an equation for a different reaction between aqueous copper ii ions cu h o and ammonia in which ammonia acts as a lewis base but not as a br nsted lowry base state what you would observe marks extra space wmp jan chem do not write outside the box d an excess of dilute ammonia solution is added to an aqueous solution containing iron ii ions in a test tube that is then left to stand for some time state and explain what you would observe marks extra space e diaminoethane h nch ch nh like ammonia can react as a base and as a ligand e i write an equation for the reaction that occurs between an aqueous solution of aluminium chloride and an excess of aqueous diaminoethane describe the appearance of the aluminium containing reaction product marks extra space question continues on the next page turn over wmp jan chem do not write outside the box e ii write an equation for the reaction that occurs between an aqueous solution of cobalt ii sulfate and an excess of aqueous diaminoethane draw a diagram to show the shape of and bonding in the complex product write an equation for the reaction that would occur if the complex product of this reaction were allowed to stand in contact with oxygen gas marks end of questions wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jan chem there are no questions printed on this page do not write on this page answer in the spaces provided copyright aqa and its licensors all rights reserved wmp jan chem

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mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry january marking guidance mark comments electron pair donor cu h o nh cu h o oh nh blue solution gives a pale blue precipitate solid cu h o nh cu h o nh h o blue solution gives a dark deep blue solution start with green solution green precipitate of fe h o oh fe oh iron ii hydroxide slowly changes to brown solid iron ii hydroxide oxidised by air to iron iii hydroxide allow lone pair donor m only awarded if m shows bronsted lowry reaction allow formation in two equations via hydroxide if b and c are the wrong way around allow one mark only for each correct equation with a correct observation max m only awarded if m shows lewis base reaction do not allow observation if compound incorrect or not given allow red brown ppt allow turns brown or if precipitate implied can only score m if m scored allow fe oh oxidised to fe oh by air o ignore equations even if incorrect question a b c d mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry january e i e ii al h o h nch ch nh al h o oh h nch ch nh white precipitate co h o h nch ch nh co h nch ch nh h o complex with en showing correct bonds from n to co co ordinate bonds arrows shown from n to co co h nch ch nh o h o co h nch ch nh oh for correct al species for correct balanced equation allow equation with formation of h nch ch nh from mol al h o ignore charge accept n n for ligand ignore incorrect h if c shown must be per ligand can only score m if m correct for co iii species for balanced equation others are possible allow o h h o if en used can score m and m only if cu not co can only score m and m allow n c h in equations

Question 1 2 3 4 5 6 7 8

Topics to revise

AQA > Inorganic chemistry > Transition metals >

6 Shape of complex ions

AQA > Inorganic chemistry > Metal Ions in aqueous solutions >

3 Required practical 11: Identify transition metal ions

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Inorganic chemistry > Transition metals >

3 Substitution reactions

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

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