AQA Jun 2010 Paper 2 Q7 (with explained solutions) |

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AQA Jun 2010 Paper 2 Q7

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do not write outside the box chlorine is a useful industrial chemical a chlorine gas is used in the manufacture of chlorine containing organic compounds a i write equations for the following steps in the mechanism for the reaction of chlorine with ethane to form chloroethane ch ch cl initiation step first propagation step second propagation step a termination step producing butane marks a ii give one essential condition and name the type of mechanism in this reaction of chlorine with ethane essential condition type of mechanism marks wmp jun chem do not write outside the box b chlorine reacts with cold water b i write an equation for this reaction mark b ii give one large scale application of the use of chlorine in water explain why it is used in this application even though chlorine is very toxic do not include cost example of application explanation of use marks b iii two different chlorine containing compounds are formed when chlorine reacts with cold dilute sodium hydroxide solution one of these compounds is sodium chloride name the other chlorine containing compound formed mark c chlorine is used in the extraction of bromine from seawater c i write the simplest ionic equation for the reaction of chlorine with bromide ions mark c ii explain why bromine has a higher boiling point than chlorine marks turn over wmp jun chem

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marking guidance mark comments chemistry aqa gce mark scheme june series part sub part i penalise absence of dot once only penalise or charges every time penalise incorrect position of dot on ethyl radical once only penalise c h once only accept ch ch with the radical dot above below to the side of the ch mark independently ignore heat for m both words needed for m for m ignore the word mechanism accept hocl or cloh accept other ionic or mixed representations ignore state symbols m initiation cl cl m first propagation cl ch ch c h m second propagation cl ch ch m termination must make c h ch ch c h or ch ch ch ch ch ch hcl ch ch cl cl c h cl ii m ultra violet uv sun light or very high temperature or oc t oc m free radical substitution cl h o hclo hcl or cl h o h clo cl m any one from in swimming pools in drinking water to sterilise disinfect sanitise water in water treatment m the health benefit outweighs the risk or wtte or a clear statement that once it has done its job little of it remains or used in very dilute concentrations small amounts low doses sodium chlorate i or sodium hypochlorite cl br br cl bromine is larger than chlorine or has more electrons electron shells or it is larger it has a larger atomic radius it is a larger molecule atom m the relative size of the molecules atoms m how size of the intermolecular force affects energy needed the forces between bromine br molecules are stronger than the forces between chlorine cl molecules leading to more energy needed to separate the molecules or converse or bromine br has stronger more vdw intermolecular forces or converse chemistry aqa gce mark scheme june series ignore the manufacture of bleach ignore to clean water ignore water purification mark independently but m can score from m explanation must be named ignore in correct formulae insist on the i in the name or half this equation ignore state symbols for m ignore whether it refers to molecules or atoms ce for reference to halide ions ignore molecular mass qol for clear reference to the difference in size of the force between molecules penalise m if covalent bonds are broken ii iii ii

Question 1 2 3 4 5 6 7 8 9

Topics to revise

AQA > Organic Chemistry > Optical isomerism >

1 Optical isomerism

AQA > Inorganic chemistry > Group 7 AS >

5 Disproportion reaction of chlorine

AQA > Organic Chemistry > Alkanes AS >

4 Free radical substitution

AQA > Inorganic chemistry > Transition metals >

10 Catalysis

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

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