AQA Jan 2010 Paper 1 Q5 (with explained solutions) |

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AQA Jan 2010 Paper 1 Q5

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section b answer all questions in the spaces provided pmt areas outside the box will not be scanned for marking a mass spectrometer can be used to investigate the isotopes in an element a define the term relative atomic mass of an element marks extra space b element x has a relative atomic mass of identify the block in the periodic table to which element x belongs and give the electron configuration of an atom of element x calculate the number of neutrons in the isotope of x which has a mass number marks extra space question continues on the next page turn over wmp jan chem pmt areas outside the box will not be scanned for marking c the mass spectrum of element z is shown below use this spectrum to calculate the relative atomic mass of z giving your answer to one decimal place identify element z relative abundance m z marks extra space wmp jan chem pmt areas outside the box will not be scanned for marking d state how vaporised atoms of z are converted into z ions in a mass spectrometer state and explain which of the z ions formed from the isotopes of z in part c will be deflected the most in a mass spectrometer marks extra space e explain briefly how the relative abundance of an ion is measured in a mass spectrometer marks extra space turn over wmp jan chem

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question part sub part a b chemistry aqa gce mark scheme january series marking guidance mark comments average mean mass of atom s of an element mass of one atom of c or average mass of one mole of atoms mass of one mole of c or weighted average mass of all the isotopes mass of one atom of c or average mass of an atom isotope compared to c on a scale in which an atom of c has a mass of d block ar d s if moles and atoms mixes max this expression marks allow d d other numbers lose m ignore transition metals can be written in full allow subscripts d and s can be in either order c x x x x or their abundances zr zirconium d e high energy electrons bombarded or hit with electrons knocks out electron s to form ions z deflected most since lowest mass lowest m z ions hit detector and cause current ions accept electrons cause electron flow bigger current more of that isotope current proportional to abundance chemistry aqa gce mark scheme january series if one graph reading error lose m and allow consequential m and m if gr errors penalise m and m but allow consequential m if not or their abundances lose m and m marks provided working shown m allow nearest consequential element from m accept zr in any circumstance accept electron gun if not lose m and m if charge is wrong on isotope lose m only accept any symbol in place of z allow lightest qwc implication that current depends on the number of ions

Question 1 2 3 4 5 6

Topics to revise

AQA > Physical chemistry > Atomic structure AS >

3 Relative Atomic and Molecular Mass

AQA > Physical chemistry > Atomic structure AS >

1 Subatomic Particles and Isotopes

AQA > Physical chemistry > Amount of substance AS >

1 The mole and Avogadro’s constant

AQA > Physical chemistry > Atomic structure AS >

2 Spectrometry

AQA > Inorganic chemistry > Periodicity AS >

1 Periodicity

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