AQA Jan 2010 Paper 1 Q3 (with explained solutions) |

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AQA Jan 2010 Paper 1 Q3

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pmt areas outside the box will not be scanned for marking the table below shows the boiling points of some hydrogen compounds formed by group elements boiling point k h o h s h se h te a state the strongest type of intermolecular force in water and in hydrogen sulfide h s water hydrogen sulfide marks b draw a diagram to show how two molecules of water are attracted to each other by the type of intermolecular force you stated in part a include partial charges and all lone pairs of electrons in your diagram marks c explain why the boiling point of water is much higher than the boiling point of hydrogen sulfide mark d explain why the boiling points increase from h s to h te marks wmp jan chem pmt areas outside the box will not be scanned for marking e when h ions react with h o molecules h o ions are formed name the type of bond formed when h ions react with h o molecules explain how this type of bond is formed in the h o ion type of bond explanation marks f sodium sulfide na s has a melting point of k predict the type of bonding in sodium sulfide and explain why its melting point is high type of bonding explanation marks extra space turn over for the next question turn over wmp jan chem

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question part sub part a b c d marking guidance mark comments chemistry aqa gce mark scheme january series hydrogen h bonds van der waals vdw dipole dipole london temporarily induced dipole dispersion forces hydrogen bonds imf in water stronger or imf vdw dipole dipole forces in h s are weaker or h bonding is the strongest imf atoms molecules get larger more shells more electrons more surface area therefore increased van der waals imf forces not just hydrogen not just dipole m for partial charges as indicated in diagram correct minimum m for all four lone pairs m for h bond from the lp to the h on the other molecule lone pair on hydrogen ce oho ce if only one molecule of water shown ce ignore energy references comparison must be stated or implied not heavier greater mr ignore references to dipole dipole forces e dative covalent coordinate lone pair both electrons two electrons on o h donated to h or pair both electrons come from o h f ionic oppositely charged ions and ions or particles ions attract strongly or strong many ionic bonds must be broken chemistry aqa gce mark scheme january series if not dative coordinate ce if covalent or blank read on explanation of a coordinate bond specific to oxygen or water required not just h attracted to lone pair since that is nearer to a h bond if not ionic ce atoms or molecules loses m and m s loses m reference to imf loses m and m

Question 1 2 3 4 5 6

Topics to revise

AQA > Physical chemistry > Atomic structure AS >

4 Electronic arrangement

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

AQA > Organic Chemistry > Halogenoalkanes AS >

1 Nucleophilic substitution

AQA > Physical chemistry > Equilibrium AS >

1 Dynamic equilibrium and factors affecting equilibrium

AQA > Organic Chemistry > Alkanes AS >

1 Industrial fractional distillation

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