AQA Jan 2010 Paper 2 Q4 (with explained solutions) |

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AQA Jan 2010 Paper 2 Q4

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areas outside the box will not be scanned for marking group metals and their compounds are used commercially in a variety of processes and applications a state a use of magnesium hydroxide in medicine mark b calcium carbonate is an insoluble solid that can be used in a reaction to lower the acidity of the water in a lake explain why the rate of this reaction decreases when the temperature of the water in the lake falls marks extra space c strontium metal is used in the manufacture of alloys c i explain why strontium has a higher melting point than barium marks extra space wmp jan chem c ii write an equation for the reaction of strontium with water areas outside the box will not be scanned for marking mark d magnesium can be used in the extraction of titanium d i write an equation for the reaction of magnesium with titanium iv chloride mark d ii the excess of magnesium used in this extraction can be removed by reacting it with dilute sulfuric acid to form magnesium sulfate use your knowledge of group sulfates to explain why the magnesium sulfate formed is easy to separate from the titanium mark turn over for the next question turn over wmp jan chem

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chem aqa gce chemistry mark scheme january series part sub part ii marking guidance mark comments antacid or to neutralise acidity or eases indigestion m decrease in t decreases the energy of the particles ions h molecules m also scores m decrease in the number of less particles ions h molecules with e eact or e minimum energy to react m few er less effective productive successful collisions strontium has a higher melting point than barium because correct reference to size of cations proximity of electrons m for sr delocalised electrons closer to cations positive ions atoms nucleus or cations positive ions atoms are smaller or cation positive ion atom or it has fewer electron shells levels relative strength of metallic bonding m sr has stronger attraction between the cations positive ions atoms nucleus and the delocalised electrons or stronger metallic bonding assume argument refers to sr but accept converse argument for ba sr h o sr oh h mg ticl mgcl ti credit suitable reference to indigestion or to laxative or to relief of constipation in m and m credit atoms but ignore calcium carbonate ignore calcium ignore any ion formula except h qol ignore general group statements penalise m if sr or ba is said to have more or less delocalised electrons ignore reference to shielding ce for reference to molecules or intermolecular forces or covalent bonds ignore van der waals forces between atoms but penalise if between molecules or multiples or multiples ii it or mgso is soluble or forms a solution and is washed away or dissolves credit reference to mgso being the most soluble group sulfate ignore disappears chem aqa gce chemistry mark scheme january series

Question 1 2 3 4 5 6 7 8 9 10

Topics to revise

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Inorganic chemistry > Group 2 AS >

3 Using Magnesium to extract Titanium

AQA > Inorganic chemistry > Group 2 AS >

2 Reactions with water and oxygen

AQA > Physical chemistry > Equilibrium AS >

1 Dynamic equilibrium and factors affecting equilibrium

AQA > Organic Chemistry > Halogenoalkanes AS >

1 Nucleophilic substitution

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