AQA Jan 2013 Paper 1 Q3 (with explained solutions) |

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AQA Jan 2013 Paper 1 Q3

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do not write outside the box the following table shows the electronegativity values of the elements from lithium to fluorine electronegativity li be a i state the meaning of the term electronegativity marks extra space a ii suggest why the electronegativity of the elements increases from lithium to fluorine marks extra space b state the type of bonding in lithium fluoride explain why a lot of energy is needed to melt a sample of solid lithium fluoride bonding explanation marks extra space wmp jan chem do not write outside the box c deduce why the bonding in nitrogen oxide is covalent rather than ionic mark extra space d oxygen forms several different compounds with fluorine d i suggest the type of crystal shown by of mark d ii write an equation to show how of reacts with steam to form oxygen and hydrogen fluoride mark d iii one of these compounds of oxygen and fluorine has a relative molecular mass of and contains by mass of fluorine calculate the empirical formula and the molecular formula of this compound show your working empirical formula molecular formula marks turn over wmp jan chem

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mark scheme general certificate of education a level chemistry unit foundation chemistry january question marking guidance the power of an atom or nucleus to withdraw or attract electrons or electron density or a pair of electrons towards itself in a covalent bond more protons bigger nuclear charge same or similar shielding electrons in the same shell or principal energy level atoms get smaller a i a ii b ionic strong or many or lots of electrostatic attractions between ions between and ions between li and f ions oppositely charged ions c small electronegativity difference difference d i simple molecular d ii of h o o hf comments mark ignore retain not same sub shell ignore more electrons if not ionic then ce if blank lose m and mark on if molecules imf metallic atoms lose m m penalise incorrect ions by mark allow strong ionic bonds for max out of m and m must be comparative allow non metals ignore simple covalent ignore state symbols allow multiples allow of written as f o d iii o o f ef of or fo mf o f or f o mark scheme general certificate of education a level chemistry unit foundation chemistry january if students get m upside down lose m m check that students who get correct answer divide by and not and if dividing by and lose m and m but could allocate m ie max calculation of of by other correct method marks penalise fl by mark

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 > Physical chemistry > Atomic structure AS >

1 Subatomic Particles and Isotopes

AQA > Physical chemistry > Bonding AS >

6 Electronegativity and intermediate bonding

AQA > Physical chemistry > Amount of substance AS >

1 The mole and Avogadro’s constant

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