1 Test for sulfates, carbonates and ammonium / PAG4

Found it useful? Your friends might too!

 

/
~
~
~
/
Show Learning Materials


Oxford Textbook Pages : 117, 119 - 120

CGP Revision Guide Pages : 66 - 67

/
/
/
/

Show Specification Ref : 3.1.4a, PAG4

/
/
/
/
Show past exam questions

Question 1 / 5

January 2011 QP – Unit 1 AQA Chemistry A-level_question_2 do not write outside the box a indium is in group in the periodic table and exists as a mixture of the isotopes in and in use your understanding of the periodic table to complete the electron configuration of indium s s p s p s d p mark b a sample of indium must be ionised before it can be analysed in a mass spectrometer b i state what is used to ionise a sample of indium in a mass spectrometer mark b ii write an equation including state symbols for the ionisation of indium that requires the minimum energy mark b iii state why more than the minimum energy is not used to ionise the sample of indium mark b iv give two reasons why the sample of indium must be ionised reason reason marks wmp jan chem do not write outside the box c a mass spectrum of a sample of indium showed two peaks at m z and m z the relative atomic mass of this sample of indium is c i give the meaning of the term relative atomic mass marks c ii use these data to calculate the ratio of the relative abundances of the two isotopes marks extra space d state and explain the difference if any between the chemical properties of the isotopes in and in difference in chemical properties explanation marks e indium forms a compound x with hydrogen and oxygen compound x contains indium and hydrogen by mass calculate the empirical formula of compound x marks turn over wmp jan chem
Show answer

Question 2 / 5

January 2011 QP – Unit 2 AQA Chemistry A-level_question_3 do not write outside the box the following pairs of compounds can be distinguished by observing what happens in test tube reactions for each pair give a suitable aqueous reagent that could be added separately to each compound describe what you would observe in each case a naf aq and nacl aq reagent observation with naf aq observation with nacl aq marks b bacl aq and mgcl aq reagent observation with bacl aq observation with mgcl aq marks c agcl s and agi s reagent observation with agcl s observation with agi s marks d butan ol l and methylpropan ol l reagent observation with butan ol l observation with methylpropan ol l marks wmp jan chem
Show answer

Question 3 / 5

June 2014 QP – Unit 2 AQA Chemistry A-level_question_6 do not write outside the box this question is about group chemistry a sea water is a major source of iodine the iodine extracted from sea water is impure it is purified in a two stage process stage stage l h o so hl h so hl cl l hcl a i state the initial oxidation state and the final oxidation state of sulfur in stage marks oxidation state of s in so oxidation state of s in h so a ii state in terms of electrons what has happened to chlorine in stage mark b when concentrated sulfuric acid is added to potassium iodide iodine is formed in the following redox equations ki h so khso l s h o ki h so khso l h s h o b i balance the equation for the reaction that forms sulfur b ii deduce the half equation for the formation of iodine from iodide ions mark mark b iii deduce the half equation for the formation of hydrogen sulfide from concentrated sulfuric acid mark question continues on the next page turn over wmp jun chem do not write outside the box c a yellow precipitate is formed when silver nitrate solution acidified with dilute nitric acid is added to an aqueous solution containing iodide ions c i write the simplest ionic equation for the formation of the yellow precipitate mark c ii state what is observed when concentrated ammonia solution is added to this yellow precipitate mark c iii state why the silver nitrate solution is acidified when testing for iodide ions mark c iv explain why dilute hydrochloric acid is not used to acidify the silver nitrate solution in this test for iodide ions mark wmp jun chem do not write outside the box d chlorine is toxic to humans this toxicity does not prevent the large scale use of chlorine in water treatment d i give one reason why water is treated with chlorine mark d ii explain why the toxicity of chlorine does not prevent this use mark d iii write an equation for the reaction of chlorine with cold water mark e give the formulas of the two different chlorine containing compounds that are formed when chlorine reacts with cold dilute aqueous sodium hydroxide mark formula formula turn over for the next question turn over wmp jun chem
Show answer

Question 4 / 5

June 2015 QP – Unit 2 AQA Chemistry A-level_question_2 do not write outside the box the following pairs of compounds can be distinguished by simple test tube reactions for each pair of compounds give a reagent or combination of reagents that when added separately to each compound could be used to distinguish between them state what is observed in each case a butan ol and methylpropan ol marks reagent observation with butan ol observation with methylpropan ol b propane and propene marks reagent observation with propane observation with propene wmp jun chem c aqueous silver nitrate and aqueous sodium nitrate do not write outside the box marks reagent observation with aqueous silver nitrate observation with aqueous sodium nitrate d aqueous magnesium chloride and aqueous barium chloride marks reagent observation with aqueous magnesium chloride observation with aqueous barium chloride turn over for the next question turn over wmp jun chem there are no questions printed on this page do not write on this page answer in the spaces provided wmp jun chem
Show answer

Question 5 / 5

June 2016 QP – Unit 2 AQA Chemistry A-level_question_4 a b do not write outside the box compounds a b c and d are isomers with the molecular formula c h o they all have a broad absorption in their infrared spectra in the range cm use table a on the data sheet to identify the bond and the functional group present responsible for this absorption mark compounds a and b are both straight chain compounds a can be oxidised to form p b can be oxidised to form q p and q are isomers with molecular formula c h o tollens reagent and fehling s solution can be used to distinguish between isomers p and q the results shown in table are obtained table compound observation with tollens reagent observation with fehling s solution no visible change no visible change silver mirror formed brick red precipitate formed use the information about compounds p and q to identify compounds a and b explain your answer with reference to the functional groups in p and q marks identity of a identity of b explanation wmp jun chem do not write outside the box c isomer c is resistant to oxidation isomer c reacts to form compound r that has an absorption in its infrared spectrum in the range cm state the bond that causes the absorption in the range cm give the displayed formula of isomer c identify the reagent and give one reaction condition needed to convert c into r marks bond displayed formula of c reagent condition question continues on the next page turn over wmp jun chem do not write outside the box d compound d is a branched chain isomer that can be oxidised to form compounds s and t d i compound s is obtained by distilling it off as it forms during the oxidation compound t is formed when the oxidation takes place under reflux identify the functional groups in s and t explain with reference to intermolecular forces why it is possible to obtain compound s but not t from the reaction mixture by distilling off s as soon as it forms marks wmp jun chem do not write outside the box d ii a student claims to have oxidised compound d figure shows the infrared spectrum of the product obtained by the student figure transmittance wavenumber cm suggest two ways in which the spectrum shows that compound d has not been oxidised marks turn over wmp jun chem
Show answer
/
/
/
/
/
/