4541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009MARKING SCHEMEBAHAN PRAKTIS BESTARI JUJ 2009CHEMISTRY SPM PAPER 1PAPER 2PAPER 304541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009MARKING SCHEMEBAHAN PRAKTIS BESTARI (JUJ) 2009PAPER 11 C 21 C 41 A2 B 22 C 42 A3 A 23 D 43 C4 D 24 C 44 B5 C 25 A 45 A6 C 26 B 46 C7 D 27 B 47 B8 D 28 C 48 D9 D 29 D 49 A10 D 30 C 50 B11 A 31 C12 C 32 B13 A 33 C14 C 34 C15 A 35 C16 D 36 A17 A 37 A18 A 38 B19 C 39 B20 A 40 C14541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009MARKING SCHEMEBAHAN PRAKTIS BESTARIJUJ 2009PAPER 2SECTION ANO MARKING CRITERIA MARKS1 (a)(i) the number of proton in a nucleus 1(ii)

T1361 (iii) T and U 1 (iv) T and U have same number of protons but different number of neutron. 1 (v) Carbon dating to estimate the age of fossils and artifacts1 ( b)2 electrons in the first shell and 5 electrons in the second shellLabel of nucleus mar! at the centre of the atom 11(c ) "#2.52$5%# 2.&2$&11TOTAL 9NO MARKING CRITERIA MARKS24541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 20092 (a)(i)Carbon dio'ide 1(ii)Lime(ater turns cloud) mil!)chal!) (hite precipitate formed 1 (b)*inc o'ide 1(c)*nC+, *n+ - C+21. correct formula for reactant2. correct formula for products1 1(d)(i) 1255 mol.../ mol 1(ii)1.Correct ratio 1 mole of *nC+, # 1 mole of C+ 2 .../ mole # .../ mole2. Correct volume of gas (ith unit .../ ' 2/ dm,..0& dm,0&. cm,11(iii).../ ' &..2 ' 1.2, molecules2./.1 ' 1.22 molecules 1TOTAL 9NO MARKING CRITERIA MARKS3 (a)(i)HCl + NaOH NaCl+ H2O1.Correct formula of reactants2. Correct Formula of products11(ii) Te no. of mol of HCl ! (22."" # ".2) $1""" $$ ".""%%&ol of NaOH! ".""%%11(iii) 1. 1 mol HCl ' 1 mol NaOH 2. &olarit( of NaOH! ".""%% # 1"""$25." !".1)6 mol dm *3 $$3. &olarit( for HCl !2(".1 # 22) 25 $$ ".1)6 mol$dm3

111( +) Colourless to pin! 1(c) 1. 2trong acid is the acid that completel) disassociated in (ater 2. produce higher concentrated of h)drogen ions. 11TOTAL 1034541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009NO MARKING CRITERIA MARKS/ (a)(i) 3art 4 #5lectrical to Chemical energ)5lectrical to Chemical 1(ii) 3art 6 #Chemical energ) to5lectrical energ)Chemical to 5lectrical 1(b)(i)7lue colour becomes palepalerthe intensit) of the blue colour decrease1 (ii)7ecause the concentration of the blue Cu2- ions remains unchanged 1(c)(i)8node#/ +9: +2 -2 92+-/e:1(ii) Cathode# 29- - 2e: 921(d);agnesium plate.;agnesium is more electropositive situated at the higher position in the electrochemical series11(e) (i)3ositive Terminal# Cu2- -2e: Cu1 (ii)

C/91 C,9?C++91. correct formula for reactant - o')gen =+>2. Correct formula for product11(d)

1. @unctional diagram 2. Labelled diagram11(e) 1. 7utene is an unsaturated h)drocarbonhasdouble bond2. 7utane is a saturated h)drocarbonhas single bond11TOTAL 1154541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009NO MARKING CRITERIA MARKS&(a) Cu2- $ 2+/2: copper (AA) ions$ sulphate ionsaccept#Cu2- $ 2+/2:$ 9-$ +9:1(b) Copper (AA) sulphate copper sulphate 1(c )(i) Bouble decompositionprecipitation reaction 1(ii) 1: solution 4 is heated until 1, of the volumeuntil saturated2: cooled to room temperature,: filter the cr)stalsaltdr) the cr)stalsalt b) using filter paper.111(d) 3b2- - 2+/2: 3b2+/* correct formula for reactants* correct formula for product11(e)(i) 2odium h)dro'ide solutionammonia aCueousammonium h)dro'ide solution1(ii) 1: 8dd sodium h)dro'ide solution (until e'cess)2: 7lue precipitate formed Af ammonia aCueousammonium h)dro'ide solution #1: add ammonia aCueousammonium h)dro'ide solution (until e'cess)2: 7lue precipitate soluble in e'cess11TOTAL 11 64541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009SECTIONBNO MARKING CRITERIA MARKS? (a) 1. 9eat change (hen one mole of (ater is formed 2. reaction bet(een an acid and an al!ali.11(b)( i) 9Cl - cm , of =..5 : 2..> mol dm:, sulphuric acid 1. 1. =25:1..> cm, of =..5 :2..> mol dm:, h)drochloric acid 2. is measured andpour into a plastic cup.2. =25:1..> cm, of =..5 : 2..> mol dm:, sodium h)dro'ideis measured andpoured into another plastic cup.,. ;easure and record the initial temperature for both solutions. /. ;i'add the t(o solutions.5. 2tir the mi'ture thoroughl).&. ;easure and record the highest temperature.?. 2teps 1 to & is repeated using =25:5.> cm, of =..5:2..> mol dm:,

sulphuric acid and sodium h)dro'ide to replace h)drochloric acid and sodium h)dro'ide. 1. 3recaution steps # the plastic cup must be covered the solutions must be added Cuic!l)the temperature reading must be ta!en immediatel) after the addition of solutions.11111111111TOTAL 20

4541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009NO MARKING CRITERIA MARKS1 (a)(i) 1. 5lectrol)teisasubstancethat canconduct electricit)(hen the) are in molten or aCueous state2. undergo chemical changes11(a)(ii) sodium chloride solutionh)drochloric acid solutionmoltenlead(AA) iodide molten lead(AA) bromide= an) 2 ans(ers of ionic compound in molten or aCueous> 2(b) (i) Lead(AA) ions and bromide ions 3b2- and 7r :1(b) (ii)anode#bro(n gas releasedcathode #shining gre) substance is seengre) solid is formedmass of the cathode increase11(b) (iii)5lectrode %#7romine gas5lectrode 4 #lead is formed 11(b)(iv)5lectrode % #27r: 7r2-2e1(c);aterials #Aron spoon$ silver plate$ silver nitrate solution 8pparatus #7atter)po(er suppl)$ connecting (ires$ bea!er3rocedure #1. @illaddpourthe silver nitrate solution into a bea!er2. Bip iron spoon as cathode and silver plate as anode,. Connect to po(er suppl) (batter))Complete the circuit11111@unctionalapparatus:1Labelleddiagram:1!spoon ,il-er plate,il-er nitrate solution4541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009NO MARKING CRITERIA MARKS9alf eCuation at anode # 8g 8g--e9alf eCuation at cathode # 8g-- e 8g+bservations #8node# The silver plate becomes thinner.Cathode # The spoon (as coated (ith a la)er ofsilver.%a)s to achieve a good electroplating#1. The ironspoon (as rotated slo(l) (hen the e'periment (as conducted.2. The iron spoon must be cleaned and free of grease,. The concentration of 2iver ions in the electrol)te or the current used must be lo( 1111111TotalD1/m;a' 1.mTOTAL 2094541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009SECTION CNO MARKING CRITERIA MARKS0 (a) (i)8llo) is a mi'ture of t(o or more elements (ith a certain fi'ed composition.1 (ii) 7ronGe:copper and tin 7rass:copper and Ginc 2teel : iron and carbon=correct allo) and correct component>:2 m 2(b) 2tatuesmonuments medals artistic materials;a!ing of musical instruments!itchen(are 7uilding of bod) of aeroplanescarssurgical instruments=8n) 2 correct uses> 2m 2(c )(i) 1.8rrangement of atoms for metal 8 and metal 7 2.Bifferent siGes of atom for metal 8 andmetal 7 (ii) 1. 8tom of the impurit) fills the disrupt the arrangement of atoms2. reduces the la)er of atoms from sliding,. 8llo) is strongerharder than its pure metal 11111d1. functioning:1m2. Biagram is labeled : 1m ,. 8pparatus #brassbronGe copper bloc!$ %eight=..5:2..!g>$ steel ball$ ruler$retort 111104541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009NO MARKING CRITERIA MARKS3rosedure#1. 8 steel ball is attached on the surface of the metal bloc!.2. =..5:2>!g (eight is held =5.:1...>m from the surface of the copper bloc!$ using thread.,. the (eight is released/. the diameter of dent formed is measured.5. 2tep/ is repeated ,5 times&. 2teps 1 to 5 are repeated (ith brassbronGe bloc!.?. the results obtainedare recorded.1111111TOTAL 20114541 SKEMA KIMIA PRAKTIS BESTARI JUJ PAHANG 2009NO MARKING CRITERIA MARKS1. (a) The rate of reaction in this reaction refers to the mass of sulphur formedper unit time$ that is the time ta!en for the cross on a filter paper placedunder the conical flas! to disappear2(b)