AQA Jun 2015 Paper 2 Q1 (with explained solutions) |

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AQA Jun 2015 Paper 2 Q1

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section a answer all questions in the spaces provided do not write outside the box a chlorine is an important industrial chemical chlorine is formed when kmno reacts with hydrochloric acid the ionic equation for this redox reaction is h mno cl mn h o cl a i deduce the half equation for the oxidation of chloride ions to chlorine mark a ii give the oxidation state of manganese in the mno ion mark a iii deduce the half equation for the reduction of the mno ions in acidified solution to manganese ii ions and water mark b chlorine behaves as an oxidising agent in the extraction of bromine from seawater in this process chlorine gas is bubbled through a solution containing bromide ions b i write the simplest ionic equation for the reaction of chlorine with bromide ions mark b ii give one observation that would be made during this reaction mark wmp jun chem b iii in terms of electrons state the meaning of the term oxidising agent do not write outside the box mark c in sunlight chlorine can also oxidise water slowly to form oxygen write an equation for this reaction give the oxidation state of chlorine in the chlorine containing species that is formed marks equation oxidation state of chlorine in the species formed d explain why chlorine has a lower boiling point than bromine marks turn over wmp jun chem

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mark scheme a level chemistry chem june question marking guidance mark comments a i cl cl e a ii or or vii or vii a iii mno h e mn h o cl br cl br or cl br cl br turns to yellow orange brown solution b i b ii ignore state symbols credit loss of electrons from lhs credit multiples do not penalise absence of charge on electron allow mn and ignore state symbols credit loss of electrons from rhs credit multiples do not penalise absence of charge on electron one of these two equations only ignore state symbols penalise red reddish as the only colour accept red brown and red orange ignore liquid penalise reference to a product that is a gas or of chlorine gains electron s takes electron s accepts electron s from the bromide ions or chlorine causes another species br to lose electron s m cl h o hcl o h cl m oxidation state m the relative size of the molecules atoms chlorine is smaller than bromine or has fewer electrons electron shells or it is smaller it has a smaller atomic radius it is a smaller molecule atom or converse m how size of the intermolecular force affects energy needed the forces between chlorine cl molecules are weaker than the forces between bromine br molecules or converse for bromine or chlorine cl has weaker fewer less vdw intermolecular forces forces between molecules b iii c d mark scheme a level chemistry chem june a precipitate penalise electron pair acceptor not simply causes loss of electrons ignore state symbols credit multiples m consequential on hcl or cl which must be the only chlorine containing product in the un balanced equation for m allow cl or cl but not cl for m ignore whether it refers to molecules or atoms ce for the clip for reference to halide ions or incorrect statements about relative size ignore molecular mass and mr ignore shielding qol in m for clear reference to the difference in size of the force between molecules reference to van der waals forces alone is not enough of

Question 1 2 3 4 5 6 7 8 9

Topics to revise

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Inorganic chemistry > Transition metals >

10 Catalysis

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Inorganic chemistry > Transition metals >

9 Manganate titration

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