AQA Jun 2013 Paper 2 Q6 (with explained solutions) |

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AQA Jun 2013 Paper 2 Q6

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do not write outside the box a chlorine displaces iodine from aqueous potassium iodide a i write the simplest ionic equation for this reaction mark a ii give one observation that you would make when this reaction occurs mark b in bright sunlight chlorine reacts with water to form oxygen as one of the products write an equation for this reaction mark c explain why chlorine has a lower boiling point than bromine marks extra space wmp jun chem

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question a i mark scheme general certificate of education a level chemistry unit chemistry in action june marking guidance mark comments cl i i cl or cl i i cl only these two equations a ii solution turns from colourless to brown red brown solution b c cl h o hcl o h cl 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 or has smaller mr or converse for bromine 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 leading to less energy needed to separate the molecules or converse for bromine or chlorine cl has weaker less fewer forces between molecules or chlorine cl has weaker less fewer intermolecular forces or converse for bromine allow grey black solid ignore purple credit multiples ignore general group statements for m ignore whether it refers to molecules or atoms ce for reference to halide ions qol for clear reference to the difference in size of the force between molecules penalise m if covalent bonds are broken

Question 1 2 3 4 5 6 7 8 9 10 11

Topics to revise

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Physical chemistry > Equilibrium AS >

1 Dynamic equilibrium and factors affecting equilibrium

AQA > Physical chemistry > Bonding AS >

9 Hydrogen bonding

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Physical chemistry > Thermodynamics >

5 Gibb’s Free Energy

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