AQA Jun 2011 Paper 1 Q5

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do not write outside the box a this question is about the first ionisation energies of some elements in the periodic table write an equation including state symbols to show the reaction that occurs when the first ionisation energy of lithium is measured mark b state and explain the general trend in first ionisation energies for the period elements aluminium to argon trend explanation marks extra space c there is a similar general trend in first ionisation energies for the period elements gallium to krypton state how selenium deviates from this general trend and explain your answer how selenium deviates from this trend explanation marks extra space d suggest why the first ionisation energy of krypton is lower than the first ionisation energy of argon mark wmp jun chem do not write outside the box e the table below gives the successive ionisation energies of an element first second third fourth fifth ionisation energy kj mol deduce the group in the periodic table that contains this element mark f identify the element that has a ion with an electron configuration of s s p s p d mark turn over for the next question turn over wmp jun chem section b answer all questions in the spaces provided do not write outside the box a there is a risk of gas explosions in coal mines this risk is mainly due to the presence of methane if the percentage of coal mine methane cmm in the air in the mine is greater than the explosion risk is much lower cmm slowly escapes from the mine into the atmosphere write an equation to show the complete combustion of methane suggest one reason why there is a much lower risk of an explosion if the percentage of cmm is greater than state why it is beneficial to the environment to collect the cmm rather than allowing it to escape into the atmosphere marks extra space wmp jun chem

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