AQA Jun 2011 Paper 5 Q4 (with explained solutions) |

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AQA Jun 2011 Paper 5 Q4

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do not write outside the box this question is about the chemistry of the period elements and the trends in their properties a i describe what you would observe when magnesium burns in oxygen write an equation for the reaction that occurs state the type of bonding in the oxide formed observations equation type of bonding marks a ii describe what you would observe when sulfur burns in oxygen write an equation for the reaction that occurs state the type of bonding in the oxide formed observations equation type of bonding marks b state the type of bonding in sodium oxide explain why sodium oxide reacts to form an alkaline solution when added to water type of bonding explanation marks wmp jun chem do not write outside the box c outline an experiment that could be used to show that aluminium oxide contains ions marks extra space d suggest one reason why a thin layer of aluminium oxide protects aluminium from corrosion in moist air mark e write an ionic equation in each case to show how aluminium oxide reacts with the following e i hydrochloric acid mark e ii aqueous sodium hydroxide mark turn over for the next question turn over wmp jun chem

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question a i a ii mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry june marking guidance mark comments mgo white flame white light solid powder smoke ash white fumes mg o ionic blue flame fumes or misty or pungent choking smelly gas s o covalent so mark flame independent of other observations penalise precipitate penalise wrong colour if more than one observation for m apply list principle if an observation is incorrect the incorrect observation negates a correct one ignore state symbols allow multiples do not allow reference to covalent character do not allow any other colour mark flame independent of other observations do not allow incorrect smell e g bad eggs apply list principle as in a i do not allow just gas or colourless gas ignore state symbols allow multiples and s penalise giant covalent mark scheme general certificate of education a level chemistry unit energetics redox and inorganic chemistry june b ionic o oxide ion reacts with water accepts a proton forming oh ions naoh sodium hydroxide can show in equation from na o even if incorrect c d e i e ii heat until molten conducts electricity can be electrolysed electrolyse and identify al o at an electrode insoluble in water al o h al h o al o oh h o or al o oh h o al oh al oh oh or if covalent can only score m m requires reference to o oxide ion allow o h o o h also allow equations with spectator na ions on both sides or dissolve in molten cryolite do not allow solution in water m can only be gained if m scored oh to score m m h o allow oxide impermeable to air water or oxide is unreactive inert allow o h and formation of aquated al species allow spectator cl ions penalise hcl not ionic allow formation of al h o oh allow na spectator ions penalise naoh not ionic

Question 1 2 3 4 5 6 7 8

Topics to revise

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Inorganic chemistry > Period 3 >

1 Reaction with oxygen and water

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Physical chemistry > Bonding AS >

1 Ionic and covalent bonding

AQA > Physical chemistry > Redox AS >

2 Balancing redox reactions

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