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Edexcel Jun 2014 (IAL) Paper 6 Q3
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![Question Number 3(a)(i) Question Number 3(a)(ii) Acceptable Answers Reject Red /orange / yellow and precipitate ALLOW Bright and correct colour Combinations of these colours AND Solid / crystals /ppt /ppte / precipitate (ie recognisable spelling for precipitate) Acceptable Answers Aldehyde OR ketone (both needed) Either order. ALLOW Carbonyl (compound/group) RCOR IGNORE contains C=O or other formulae Mark Colour alone Pale yellow Other colour combinations eg red / brown Reject Mark WCH0601 1406<br />
Question Number 3(b)(i) Mark Acceptable Answers Reject (1) First mark Solutions: (aqueous) silver nitrate / AgNO3 Second mark (aqueous) ammonia / NH3 / NH4OH (1) -) Reagents in any order. IGNORE NaOH NOTE Ammoni(a)cal silver nitrate scores first 2 marks BUT Silver diam(m)ine / [Ag(NH3)2]+(NO3 scores only 1 mark Third mark dependant on any silver salt and ammonia / ammoni(a)cal silver nitrate / silver diam(m)ine / [Ag(NH3)2]+ Condition: Clean test tubes / warm / heat ALLOW heat to below 500C (1) Fourth mark stands alone - independent Positive result: Silver mirror / grey or black precipitate ALLOW Silver (alone) silver solid / silver ppt / ppte / metallic silver OR Silver mirror solution (1) + ions Other silver salts Silver / Ag+ ions Silver compounds Ammonium / NH4 Anything else eg nitric acid Shake vigorously Heat under reflux 20-250C Silver colour / silver coloured solution WCH0601 1406<br />
Question Number 3(b)(ii) Question Number 3(c)(i) Mark Mark Acceptable Answers Reject Just carbonyl group Just C=O Reject Dark yellow Ketone ALLOW Keytone OR Carbonyl group in a ketone OR C=O in a ketone ALLOW ketone with additional correct general, displayed / structural formulae Acceptable Answers (pale) yellow precipitate / solid / crystals Qualification of yellow is allowed like pale, light, creamy, or bright, but not dark. Both colour and state ALLOW Cloudy yellow alone OR Recognisable spelling or abbreviations for precipitate like ppt / ppte / percipitate IGNORE antiseptic smell WCH0601 1406<br />
Question Number 3(c)(ii) Methyl ketone / CH3CO (group) Acceptable Answers OR Contains (R) OR Methyl attached to a carbonyl (group)/C=O OR It is a 2-one ketone Reject Mark Secondary alcohol Functional group on second carbon atom WCH0601 1406<br />
Question Number 3(d) Mark Acceptable Answers Reject First mark One hydrogen / proton environment OR One kind of hydrogen / proton ALLOW Hydrogen ion for proton (1) Second mark (Singlet so) no neighbouring hydrogens (on adjacent carbons) OR Chemical shift is correct for a ketone (1) Third mark Hydrogens must be shown, but methyl groups do not have to be displayed. ALLOW Correct structural or skeletal formula (1) Just it is a singlet Just not split(ted) by any other hydrogen Chemical shift is the same as a methyl group (alone) Chemical shift is at 2.2 (alone) WCH0601 1406<br />
Acceptable Answers Reject Faster (1) Solid / precipitate / crystals are drier OR more solvent / solution / filtrate removed OR Reverse argument for normal filtering (1) IGNORE More efficient / more effective / increases yield / more pure Reducing pressure reduces boiling temperature Question Number 3(e)(i) Mark WCH0601 1406<br />
Acceptable Answers Question Number 3(e)(ii) First mark Buchner / side-armed flask (1) Second mark Side arm connected to pump and bung/rubber around neck of funnel OR Quickfit flask funnel shown with clear sealed join and pump labelled (1) ALLOW aspirator for pump, drawings of tap pump IGNORE Blocked outlet to pump Third mark Buchner funnel with flat filter paper The filter paper must be labelled OR be drawn flat and clearly shown Mark Reject Heated flask Large gap between funnel and flask Pressure pump (alone) Suction (alone) Filter paper which goes up the sides of the funnel Fluted filter paper WCH0601 1406<br />
above the pores of the funnel OR Hirsch funnels see diagrams below Notice sintered / fitted glass does not need a filter paper IGNORE Blocked outlet to funnel (1) Notice heating of funnel / solvent can be ignored WCH0601 1406<br />
Question Number 3(e)(iii) Acceptable Answers Reject Mark First mark Dissolve in / mix with MINIMUM / SMALL volume / amount of HOT ethanol / solvent (to dissolve most of the solid / make a saturated solution) (1) Second mark Filter HOT (to remove insoluble impurities)# AND Cool / allow to crystallize (1) Third mark Filter (under reduced pressure) (to remove soluble impurities)# AND Wash with COLD / minimum volume of solvent (1) Fourth mark Dry between filter papers / with paper towel / in desiccator Both dry and method of drying ALLOW Use of cool / warm oven OR oven at specified temperature below 100oC Use of hair drier / electric hand drier (1) Note penalties may be applied: *Penalise use of water only once #If impurities are wrong way round penalise only once Both these penalties can be applied to reduce the mark by 2 Water as solvent* Filter alone (Wash) with water* Drying agents unless in desiccator WCH0601 1406<br />
Question Number 3(e)(iv) Mark Acceptable Answers Reject Measure the melting temperature (1) IGNORE References to sharp melting temperature Compare with literature / data (book) / known value (1) Second mark conditional on melting temperature mark IGNORE IR spectroscopy and check fingerprint region Boiling temperature alone Chromatography and compare Rf values If melting temperature is clearly for propanone and not propanone derivative. Total for Question 3 = 23 marks Total for Paper = 50 Marks WCH0601 1406<br />](https://learnah.org/wp-content/uploads/2018/08/June_2014_IAL_MS_-_Unit_6_Edexcel_Chemistry_A-level_3-0.jpg)
