6 Percentage yield and atom economy

 

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Oxford Textbook Pages : 39 - 41

CGP Revision Guide Pages : 22 - 23

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Show Specification Ref : 3.1.2.5

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Question 1 / 3

AQA Jan 2010 Paper 1 Q2 pmt areas outside the box will not be scanned for marking ammonium sulfate reacts with sodium hydroxide to form ammonia sodium sulfate and water as shown in the equation below nh so s naoh aq nh g na so aq h o l a a g sample of ammonium sulfate reacted completely with cm of a sodium hydroxide solution i calculate the amount in moles of nh so in g of ammonium sulfate a marks a ii hence calculate the amount in moles of sodium hydroxide which reacted a mark iii calculate the concentration in moldm of the sodium hydroxide solution used mark b calculate the percentage atom economy for the production of ammonia in the reaction between ammonium sulfate and sodium hydroxide marks wmp jan chem c ammonia is manufactured by the haber process nh n h calculate the percentage atom economy for the production of ammonia in this process mark d a sample of ammonia gas occupied a volume of m at c and a pressure of kpa the gas constant r jk mol calculate the amount in moles of ammonia in this sample marks extra space e glauber s salt is a form of hydrated sodium sulfate that contains by mass of sodium sulfate hydrated sodium sulfate can be represented by the formula na so xh o where x is an integer calculate the value of x marks extra space pmt areas outside the box will not be scanned for marking turn over wmp jan chem
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Question 2 / 3

AQA Jan 2013 Paper 2 Q10 do not write outside the box chlorine is a powerful oxidising agent a write the simplest ionic equation for the reaction between chlorine and aqueous potassium bromide state what is observed when this reaction occurs marks extra space b write an equation for the reaction between chlorine and cold dilute aqueous sodium hydroxide give a major use for the solution that is formed by this reaction give the iupac name of the chlorine containing compound formed in this reaction in which chlorine has an oxidation state of marks extra space wmp jan chem c write an equation for the equilibrium reaction that occurs when chlorine gas reacts with cold water do not write outside the box give one reason why chlorine is used for the treatment of drinking water even though the gas is very toxic marks extra space d state how you could test a sample of water to show that it contains chloride ions in your answer give a reagent one observation and the simplest ionic equation for the reaction with the reagent marks extra space end of questions wmp jan chem
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Question 3 / 3

AQA Jun 2016 Paper 2 Q6 do not write outside the box the halogens are the elements in group a the electronegativities of the halogens are shown in table table halogen fluorine chlorine bromine iodine electronegativity explain the trend in electronegativities shown by the halogens marks b the halogens can all behave as oxidising agents in reactions b i explain in terms of electron transfer the meaning of the term oxidising agent mark b ii an equation for the reaction that takes place when chlorine gas is bubbled through aqueous potassium bromide is shown cl g kbr aq br aq kcl aq explain with reference to the oxidation states why this is a redox reaction mark wmp jun chem do not write outside the box c solid sodium halides react with concentrated sulfuric acid c i a sample of solid sodium iodide is reacted with concentrated sulfuric acid a black solid forms and hydrogen sulfide gas is produced write a half equation for the reaction of sulfuric acid to form hydrogen sulfide mark c ii write a half equation for the formation of the black solid mark c iii use your answers to parts c i and c ii to write an overall equation for the reaction of sodium iodide with concentrated sulfuric acid mark c iv give the role of sulfuric acid in its reaction with sodium iodide tick one box mark acid oxidising agent reducing agent electrophile c v write an equation for the reaction of concentrated sulfuric acid with solid sodium fluoride mark c vi suggest one reason why the reaction of sodium fluoride with concentrated sulfuric acid is different from the reaction with sodium iodide mark turn over wmp jun chem do not write outside the box d chlorine reacts with water to form an equilibrium mixture containing hydrochloric acid and chloric i acid d i write an equation for the formation of this equilibrium mixture mark d ii household bleach contains sodium chlorate i and sodium chloride state and explain with reference to your equation in part d i why it is dangerous to acidify an aqueous mixture of sodium chlorate i and sodium chloride marks wmp jun chem
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