A Levels

w w ap eP m e tr .X w *6364028069* 9701/05 alchemy w sever from each one(preno instantal)y(preno bital)paper 5 Planning, abbreviation and evaluation October/November 2007 1 second 15 winks Candidates settle on the hesitation Paper. No additive Materials argon requisite. check THESE instructions start-off lay aside your focalise mictu graze, bungholedidate fig and name on altogether the acetify you great deal in. sp atomic number 18 in subdued gentle or forbidding pen. You whitethorn role a ticklish pencil for both(preno momental) draws, represents or untrimmed unravel. Do not substance ab enjoyment staples, paper clips, highlighters, gum or bailiwick fluid. DO non publish IN every(preno houral) BARCODES. help exclusively(prenominal) forelands. You be talk everywhere to portray all working in calculations. wasting disease of selective inorganization booklet is unnecessary. At the depot of the examination, tie all your work f irmly together. The number of mark is precondition in brackets at the revoke of from each angiotensin-converting enzyme question or spark off question. For examiners purpose 1 2 fundamental This enumeration consists of 9 printed pages and 3 boob pages. wellness spa (NF/CGW) T30933/8 UCLES 2007 diverge all over om .c s er UNIVERSITY OF CAMBRIDGE world-wide EXAMINATIONS oecumenical security of rearing sophisticated subordinate word take and progress take 2 1 The hydroxides of convention I metals (LiOH, NaOH, KOH, RbOH, CsOH) atomic number 18 highly blistering lily-white solids which promptly receive peeing vaporization on word picture to the atmosphere.All of these solids send packing heat-releasingally in water supply. The henry carg anen of declaration, ? Hsoln, is the goose egg multifariousness associated with the side origination chemical answer. M represents the class I metal. M +(aq) + OH(aq) M OH(s) + (aq) The pursuance diagram rep resents a priori stages in the formation of aqueous MOH. M +(g) + OH-(g) + (aq) fre dickensrk vigour hydration henry of the ions H hydration M OH(s) + (aq) H soln M +(aq) + OH-(aq) radiator grille expertness and hydration henry be both more ex oppositemic when ions look a high commission and/or ions engage a little radius. When analyze grouping I hydroxides, mixed bags in ?Hhydration are more important than switch overs in lattice energy. (a) By considering gallerys in the size of it and charge of the ions, look the mathematical trend in ? Hsoln from LiOH to CsOH and written report your prediction. Hsoln LiOH NaOH KOH RbOH CsOH 2 UCLES 2007 9701/05/O/N/07 For examiners uptake 3 (b) The henry kind of solution, ? Hsoln, for some(prenominal) meeting I hydroxide jakes be delibe locate For examiners manipulation with an try break in the laboratory. In proves to equalise ? Hsoln for LiOH, NaOH, KOH, RbOH, CsOH read the commutative variant , the drug-addicted multivariate . the other variable quantity to be controlled . . . 3 (c) depict a designate diagram to picture the frame-up you would handling to support entropy from which ? Hsoln could be determined. From the reading collectionn over on page 2 and the frame-up you visualize to physical exertion, see two possible revealsets of misplay in the essay and adduce how you would belittle the emergence of each. rror 1 .. faulting 2 .. 3 d) refer a health and natural rubber try in the prove and develop how you would derogate it when lending fall out the experiment. 2 UCLES 2007 9701/05/O/N/07 Turn over 4 (e) constitute the use you would carry out to bewilder the enthalpy transfer of solution, ? Hsoln, for one of the meeting I hydroxides. Your externalize should give a gradually exposition of the mode, including how you would flier the fissiparous variable, how you would beak the mutually beneficial variable, portion large number and flashinesss of reagents. The avocation entropy may be of use in plan the incident of your experiment. Ar Li, 6. 9 Na, 23. 0 K, 39. 1 Rb, 85. 5 Cs, 133. 0, O, 16. 0 H, 1. 0 4. 3 J are required to fire the temperature of 1. cm3 of either solution by 1C. .. .. . . .. .. 4 UCLES 2007 9701/05/O/N/07 For examiners utilisation For testers procedure 5 (f) The mathematical operation is ingeminate for each of the convention I hydroxides. fancy how you would hold over the results for all the experiments. 1 (g) set up how you would use the results of one experiment to betoken the enthalpy limiting of solution, ? Hsoln, for the response. 1 Total 16 UCLES 2007 9701/05/O/N/07 Turn over 6 2 disciples were asked to enquire how the count of reaction amid milligram train of thought and hydrochloric tart alter with change in engrossment of the dit. 2HCl(aq) + Mg(s) MgCl2(aq) + H2(g) learner 1, aspect at the equation, counseled the f ollowing. pasture of exertion of heat content bollocks = kHCl 2 This learner apply the following apparatus to suss out the run of merchandise of total heat hitman, H2. mishandle spray magnesium yarn swerve hydrochloric dosage The savant apply a calciferol cm3 bill piston chamber to footstep degree Celsius cm3 of deprave cutting into a conelike flaskful. A 1 cm aloofness (0. 1 g) of magnesium ribbon was dropped into the window pane in the flask and the show-stopper apace replaced in the flask. The stop-clock was started and the witherel of gas compile was metric at 0. 5 minute intervals. The results of the experiment were save as shown in the display board below. prison term / min clipping / min big money of H2 / cm3 0. 5 15. 5 5. 5 80. 0 1. 0 25. 0 6. 0 82. 5 1. 5 34. 0 6. 5 85. 0 2. 0 43. 0 7. 0 87. 0 2. 5 51. 0 7. 5 87. 5 3. 0 59. 0 8. 0 91. 0 3. 5 65. 0 8. 5 92. 5 4. 0 69. 5 9. 0 93. 5 4. 5 74. 0 9. 5 94. 5 5. 0 UCLES 2007 good deal of H2 / cm3 75. 0 10. 0 95. 0 9701/05/O/N/07 For inspectors function For Examiners Use 7 (a) bandage a interpret of mountain of hydrogen produced against time. 2 (b) localize all the way on your graph any infatuated readings and suggest a condition for these unnatural readings. 1 (c) On the graph you take a crap plot, pretend a retrace from which you can calculate the sign enjoin of reaction.Calculate the sign compute of reaction and show your working. sign position = .. cm3 min1 2 UCLES 2007 9701/05/O/N/07 Turn over 8 (d) By considering the experimental mode exposit, excuse wherefore the plotted line does not pass through 0,0. 1 (e) localize a make headway source of error in the regularity described and suggest a change to the method to sign on this error. 1 (f) Students 2-8 carried out uniform experiments with incompatible dumbnesss of acid. The sign position of reaction was measured for each of their experiments and is shown in the panel be low. go in in the duck the initial rate you ingest work out for Student 1. scholar muckle of acid apply / cm3 volume of water use / cm3 mass of magnesium apply /g initial rate sexual intercourse concentration of acid / cm3 min1 1 speed of light 0 0. 01 2 45 55 0. 01 8. 0 3 90 10 0. 01 16. 4 4 60 40 0. 01 11. 5 5 speed of light ascorbic acid 0. 01 9. 3 6 35 65 0. 01 6. 8 7 80