AQA Jun 2012 Paper 1 Q1

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section a answer all questions in the spaces provided do not write outside the box the element rubidium exists as the isotopes rb and rb a state the number of protons and the number of neutrons in an atom of the isotope rb number of protons number of neutrons marks b i explain how the gaseous atoms of rubidium are ionised in a mass spectrometer marks b ii write an equation including state symbols to show the process that occurs when the first ionisation energy of rubidium is measured mark c the table shows the first ionisation energies of rubidium and some other elements in the same group element sodium potassium rubidium first ionisation energy kj mol state one reason why the first ionisation energy of rubidium is lower than the first ionisation energy of sodium mark wmp jun chem do not write outside the box d i state the block of elements in the periodic table that contains rubidium mark d ii deduce the full electron configuration of a rubidium atom mark e a sample of rubidium contains the isotopes rb and rb only the isotope rb has an abundance times greater than that of rb calculate the relative atomic mass of rubidium in this sample give your answer to one decimal place marks f by reference to the relevant part of the mass spectrometer explain how the abundance of an isotope in a sample of rubidium is determined name of relevant part explanation marks g predict whether an atom of sr will have an atomic radius that is larger than smaller than or the same as the atomic radius of rb explain your answer atomic radius of sr compared to rb explanation marks turn over wmp jun chem compound x is shown below it is a member of a homologous series of hydrocarbons do not write outside the box h h ccch c h a i deduce the general formula of the homologous series that contains x mark a ii name a process used to obtain a sample of x from a mixture containing other members of the same homologous series mark b there are several isomers of x b i give the iupac name of the position isomer of x mark b ii draw the structure of a functional group isomer of x c at high temperatures one molecule of c h can be converted into two molecules of x and one molecule of another compound c i write an equation for this reaction mark mark wmp jun chem

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