1 Periodicity

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Oxford Textbook Pages : 142 - 151

CGP Revision Guide Pages : 94 - 95

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Show Specification Ref : 3.2.1.1, 3.2.1.2

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Show past exam questions

Question 1 / 5

January 2012 QP – Unit 1 AQA Chemistry A-level_question_2 do not write outside the box a trends in physical properties occur across all periods in the periodic table this question is about trends in the period elements from lithium to nitrogen identify from the period elements lithium to nitrogen the element that has the largest atomic radius mark b i state the general trend in first ionisation energies for the period elements lithium to nitrogen mark b ii identify the element that deviates from this general trend from lithium to nitrogen and explain your answer element explanation marks extra space c identify the period element that has the following successive ionisation energies first second third fourth fifth sixth ionisation energy kj mol mark wmp jan chem d draw a cross on the diagram to show the melting point of nitrogen do not write outside the box melting point k lithium beryllium boron carbon nitrogen mark e explain in terms of structure and bonding why the melting point of carbon is high marks extra space turn over wmp jan chem
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Question 2 / 5

June 2010 QP – Unit 1 AQA Chemistry A-level_question_2 the following diagram shows the first ionisation energies of some period elements do not write outside the box first ionisation energy kj mol na mg al si cl a draw a cross on the diagram to show the first ionisation energy of aluminium mark b write an equation to show the process that occurs when the first ionisation energy of aluminium is measured marks c state which of the first second or third ionisations of aluminium would produce an ion with the electron configuration s s p s mark d explain why the value of the first ionisation energy of sulfur is less than the value of the first ionisation energy of phosphorus marks extra space wmp jun chem do not write outside the box e identify the element in period that has the highest first ionisation energy and give its electron configuration element electron configuration marks f state the trend in first ionisation energies in group from beryllium to barium explain your answer in terms of a suitable model of atomic structure trend explanation marks extra space turn over for the next question turn over wmp jun chem do not write outside the box in this question give all your answers to three significant figures magnesium nitrate decomposes on heating to form magnesium oxide nitrogen dioxide and oxygen as shown in the following equation mg no s mgo s no g o g a thermal decomposition of a sample of magnesium nitrate produced g of magnesium oxide a i calculate the amount in moles of mgo in g of magnesium oxide marks a ii calculate the total amount in moles of gas produced from this sample of magnesium nitrate mark b in another experiment a different sample of magnesium nitrate decomposed to produce mol of gas calculate the volume in dm that this gas would occupy at k and pa the gas constant r j k mol marks extra space wmp jun chem
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Question 3 / 5

June 2011 QP – Unit 1 AQA Chemistry A-level_question_5 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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Question 4 / 5

January 2012 QP – Unit 2 AQA Chemistry A-level_question_5 do not write outside the box iodine reacts with concentrated nitric acid to produce nitrogen dioxide no a i give the oxidation state of iodine in each of the following i hio marks a ii complete the balancing of the following equation i hno hio no h o mark b in industry iodine is produced from the nalo that remains after sodium nitrate has been crystallised from the mineral chile saltpetre the final stage involves the reaction between nalo and nal in acidic solution half equations for the redox processes are given below io e h l h o l l e use these half equations to deduce an overall ionic equation for the production of iodine by this process identify the oxidising agent overall ionic equation the oxidising agent marks wmp jan chem do not write outside the box c when concentrated sulfuric acid is added to potassium iodide solid sulfur and a black solid are formed c i identify the black solid mark c ii deduce the half equation for the formation of sulfur from concentrated sulfuric acid mark d when iodide ions react with concentrated sulfuric acid in a different redox reaction the oxidation state of sulfur changes from to the reduction product of this reaction is a poisonous gas that has an unpleasant smell identify this gas mark e a yellow precipitate is formed when silver nitrate solution acidified with dilute nitric acid is added to an aqueous solution containing iodide ions e i write the simplest ionic equation for the formation of the yellow precipitate mark e ii state what is observed when concentrated ammonia solution is added to this precipitate mark e iii state why the silver nitrate is acidified when testing for iodide ions mark question continues on the next page turn over wmp jan chem do not write outside the box f consider the following reaction in which iodide ions behave as reducing agents cl aq i aq i aq cl aq f i in terms of electrons state the meaning of the term reducing agent mark f ii write a half equation for the conversion of chlorine into chloride ions mark f iii suggest why iodide ions are stronger reducing agents than chloride ions marks extra space wmp jan chem
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Question 5 / 5

June 2014 QP – Unit 2 AQA Chemistry A-level_question_3 do not write outside the box a antimony is a solid element that is used in industry the method used for the extraction of antimony depends on the grade of the ore antimony can be extracted by reacting scrap iron with low grade ores that contain antimony sulfide sb s a i write an equation for the reaction of iron with antimony sulfide to form antimony and iron ii sulfide mark a ii write a half equation to show what happens to the iron atoms in this reaction mark b in the first stage of the extraction of antimony from a high grade ore antimony sulfide is roasted in air to convert it into antimony iii oxide sb o and sulfur dioxide b i write an equation for this reaction mark b ii identify one substance that is manufactured directly from the sulfur dioxide formed in this reaction mark wmp jun chem do not write outside the box c in the second stage of the extraction of antimony from a high grade ore antimony iii oxide is reacted with carbon monoxide at high temperature c i use the standard enthalpies of formation in table and the equation given below table to calculate a value for the standard enthalpy change for this reaction table sb o s co g hf kj mol sb i co g sb o s co g sb i co g marks c ii suggest why the value for the standard enthalpy of formation of liquid antimony given in table is not zero mark c iii state the type of reaction that antimony iii oxide has undergone in this reaction mark d deduce one reason why the method of extraction of antimony from a low grade ore described in part a is a low cost process do not include the cost of the ore mark turn over wmp jun chem
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