AQA Jan 2010 Paper 5 Q8 (with explained solutions) |

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AQA Jan 2010 Paper 5 Q8

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section b answer all questions in the spaces provided areas outside the box will not be scanned for marking a state and explain the trend in electronegativities across period from sodium to sulfur marks extra space wmp jan chem areas outside the box will not be scanned for marking b explain why the oxides of the period elements sodium and phosphorus have different melting points in your answer you should discuss the structure of and bonding in these oxides and the link between electronegativity and the type of bonding marks extra space question continues on the next page turn over wmp jan chem areas outside the box will not be scanned for marking c a chemical company has a waste tank of volume dm the tank is full of phosphoric acid h po solution formed by adding some unwanted phosphorus v oxide to water in the tank a cm sample of this solution required cm of mol dm sodium hydroxide solution for complete reaction calculate the mass in kg of phosphorus v oxide that must have been added to the water in the waste tank marks extra space wmp jan chem

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question part sub part a b chemistry aqa gce mark scheme january series marking guidance mark comments electronegativity increases proton number increases increase in nuclear charge same number of electron shells levels attraction of bond pair to nucleus increases big difference in electronegativity leads to ionic bonding smaller covalent sodium oxide ionic lattice strong forces of attraction between ions p o covalent molecular weak intermolecular forces between molecules melting point na o greater than for p o or same radius or shielding of outer electrons remains the same allow electrons in bond instead of bond pair lose a mark if formula incorrect must have covalent and molecular or molecules or weak vdw or weak dipole dipole between molecules or argument relating mpt to strength of forces c moles naoh moles of h po moles of naoh moles of p in l moles of p o mass of p o g kg chemistry aqa gce mark scheme january series m moles of naoh correct m is for m is for factor of m is for factor of or if p o or if p o m is for multiplying moles by mr with correct units allow conseq on incorrect m allow

Question 1 2 3 4 5 6 7 8 9

Topics to revise

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Physical chemistry > Atomic structure AS >

1 Subatomic Particles and Isotopes

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Physical chemistry > Energetics and kinetics AS >

5 Kinetics

AQA > Physical chemistry > Acid base equilibria >

1 Bronsted-Lowry theory and pH

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