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CIE Nov 2015 v2 Paper 2 Q3
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![The elements in Period 3, Na, Mg, Al, P and S, all react with oxygen when heated in air. PMT (a) (i) Give the formula of the oxide formed when each element is heated in air. One has been completed for you. Na =Mg =Al = Al 2O3 P =S =[2] (ii) Describe what you would see when sodium and sulfur are each heated separately in air and give an equation for each reaction. NaequationSequation[4] (b) The oxides show variations in their behaviour when added to water, acids and alkalis. (i) Place the symbols of the elements in (a)(i) in the appropriate row of the table to indicate this behaviour. acidic amphoteric basic [2] (ii) State the bonding present in acidic and basic oxides. acidicbasic[2] (iii) Write equations for the reaction of aluminium oxide with each of hydrochloric acid, HCl, and sodium hydroxide, NaOH. with HClwith NaOH[2] (c) Explain how the presence of an impurity in carbonaceous fuels can give rise to acid rain. name of impurity[2] [Total: 14]UCLES 2015 9701/22/O/N/15<br />
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![Page 4 Mark Scheme Syllabus Paper Cambridge International AS/A LevelOctober/November 2015 9701 22 Question Mark Scheme (iv) ( MgSO4(s) + 7H2O(l)MgSO4.7H2O(s) ) PMT Mark Total 85.0 (kJ mol 1 ) (+)9.60 (kJ mol 1 [1] [1] MgSO4(aq) (v) H + 9.6 = 85.0 H = 85.09.6 = 94.6 (kJ mol (a) (i) Na2O or Na2O2; MgO; P4O10 or P4O6 ; SO2 (ii) Na: Yellow / orange / gold flame / white solid / powder / smoke 4Na + O22Na2O or 2Na + O2Na2O2 S: Blue flame / (yellow) solid melts / turns red / amber / white fumes S + O2SO2 (b) (i) acidic P and S amphoteric Al and basic Na and Mg (ii) acidic: covalent (bonding) basic: ionic (bonding)Cambridge International Examinations 2015 [1] [1] [7] [1] [1] [1] [1] [1] [1] [1] [1] [1] [1] [2] [4] [2] [2]<br />
age e 5 Ca amb brid dge Mar rk S Sche eme Inte erna atio nal AS/ /A L Leve elOc ctob ber/N Nov vem PMT PPap per Sy yllab bus 9 970 22 Ma ark To otal ber r 201 15 ark k Sc hem me 2O3 3 + 6 6HC Cl2A AlCl l 3 + 3 3H2 O O OR 2O3 3 + 6 6H 3 3+2 2Al 3H2 2O 2O3 3 + 2N 2O3 3 + 2N aOH H + + 7H H2O aOH H + + 3H H2O 2N NaA l (O OH)4 (H2O O)2 OR 2N NaA l (O OH)4 OR 2O3 3 + 2N aOH H2N NaA AlO2 2 + H H2O OR 2O3 3 + 2O OH 2O3 3 + 2O OH + 7 7H2O O2 2[Al( (OH H2O) H)4(H )2] + 3 3H2O O2 2[Al( (OH H)4] OROR 2O3 3 + 2O OH2 2AlO O2 + H H2O su ulfur fo orms s SO O2 / S SO2 + / m mixe es H H2O H2S SO3 or in n wo ords SO O2 + mixes s H2 2O ( (a acid) ) / o r in wor rds + / m + / m SO O2 + mixes s H2 2O + + (1/ /2O 2)H2 SO4 r in w wor rds / or ucle eoph hilic Su bstit tutio on Ha as a a ch hiral cen rbon n OR R ha as a a ca arbo C att tach hed to 4 4 diff fere ent g grou ntre / / car n / C ups / / ato oms / / cha ains e / lin ha as n no p lane ne o of sy ymm metry El limin natio onCa ambr ridge e Int terna ation nal E Exam mina ation ns 20 015 Q Ques stio on (ii ii) (c c) (a a) ( (i) (i ii) (ii ii) (iv v) [1 1] [1 1] [1 1] [1 1] [2 2] [2 2] [1 4] [1 1] [1 1] [1 1] [1 1] [1+ +1] [2 2] [1 1] [1 1]<br />](https://learnah.org/wp-content/uploads/2018/08/November_2015_v2_MS_-_Paper_2_CIE_Chemistry_A-level_3-0.jpg)
