stpm johor chemistry paper 1 2011 trial (edu.joshuatly) edu.joshuatly

8/4/2019 STPM Johor Chemistry Paper 1 2011 Trial (edu.joshuatly) Edu.joshuatly

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CONFIDENTIAL* 2Section A

Four suggested answers labeled A, B1 C an d D are given for each question. Chooseone correct answer.

1. For which of the following would the lattice energy be expected to have the greatestnumerical value {the greatest mag nitude, disregarding sign)?

A NaCiB KiC PbSO4D MgO

2 Wh ich of the following is the cor re ct trend of the electrical conductivity of the elementsNa1 Mg1 Si and P?

A Mg > Na > Si > P.B Na > Mg > Si > P.C Mg > Na > P > Si.D P > Si > Na > Mg.

% p r o d u c tVWiich of the following reactions at a constant temp erature can be explained by the graphabove?

A X(g) * 2Y (g) v = ^ 2Z(g)B X(g ) + V (g ) T -= * 2Z(g)C X(g) + 2Y(I) ^ = ^ 2Z(I)D X(g) v== 4 2Z(g)

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CONFIDENTIAL* 4

4 Arran ge the fo l lowing com pou nds in ascending order of thei r boi ling points.1 (CH 3)3C H2 C H 3C H 2C H 2O H3 C H 3C H 2C H 2S H4 C H 3C H 2C H 2C H 3

A 1 4 3 2 B 3 2 4 1C 4 1 3 2 D 1 4 2 3

5. Th e half-l ife of a fi rst order rea ction is 5.00 hours. Th e rate consta nt, in unit second"1,forth is react ion is

A 3,85 x 10"5B 2,00 x 10"3C 1.25 x 10'3D 9.63 x 10^

6 The standa rd electrode potent ia ls are given below.Zn 2+ (aq) + 2e ^ Zn(s); E 6 = - 0.76 VA g + (aq ) + e ^ Ag(s ) ; E e = + 0 . 8 0 V

What is the e.m.f of the cel l that consists of the half cel ls of zinc and si lver?

A [0.80 + {-0.76)] VB [0.80 - (-0.76 )] VC [(2 X 0.80) + (-0.76)] VD [(2 x 0.80 ) - (-0.7 6)] V



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CONFIDENTIAL* 4

7 T h S ~p f r a m m o n i a g a s i s P l o t t e d against p at constant temperature. Which of the followinggraphs is most likely to be co rrect? [d = density of ammonia; p = pressure]

8 The following series of lines is formed in the visible light region of the emission spectrum ofthe hydrogen atom:

Which of the following statements is not true?A Line P has the longest wavelength.B Line P has the highest colour intensity.C Line P is violet while Iine Q is red in colour,D The series is called the Balmer series.

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CONFIDENTIAL* 8

9 When 8 A of electricity is pass through m olten aluminium oxide using inert electrodes for100 minutes, what is the closest vo lume of gas released at s.t.p?[1 mole of gas at s.t,p oc cupies 22 .4 dm3; Faraday constant = 9.65 x 104 C mol"1]

A 2.8 dm3 B 5.6 dm3 C 8.4 dm 3 D 11.2 dm3

10 The boiling point - comp osition graph for two miscible liquids P and Q is shown below:

Wha t is the comp osition of the distillates if a mixture of compo sition X is fractional distilled?A P and Q B P and ZC Q a n d Z D Z o n ly

11, X and Y are two miscible liquids which obey Raoult's Iaw At 25 'C , the vapourpressure of X is 3.20 kPa. What is the partial pressure of X in a mixture of 45 g X and253 g Y? [R elative m olecular mass: X = 18, Y = 46]

A 2.80kPa B 2.00kPa C 1.75kPa D 1.00kPa

12 Wh ich of the following mixture would experience the smallest change in pH when one dropofdilute hydrochloric acid is added to it?

A 100 cm3 NH 3 0.1 mol dm"3 + 100 cm3 HCl 0.1 mol dm'3.B 100 cm3 NH 3 0.1 mol dm"3 + 100 cm3 HCI 0.2 mol dm'3.C 100 cm 3 NaOH 0.2 mol dm"3 + 100 cm3 CH3COOH 0.1 mol dm'3.D 100 cm3 NaOH 0.1 mol dm -3 + 100 cm3 CH3COOH 0.2 mol dm'3.



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CONFIDENTIAL* 10

13. If the radius of a metal atom is 125 pm, determine the volume of one unit cell thatform face- centred cubic, [1pm = 10"12m]

A 5.52 x 10"24

cm3

B 4.42 x 10"23

cm3

C 1.95 x 10"24cm 3 D 1 .5 6 x 1 0 ' " c m 3

14 The enthalpy change of solution of sodium hydroxide is - 44.4 kJ moP1. Whe n a sample ofsodium hydroxide dissolves in 250 cm 3 of water, the temperature of water changes by 14 K.what is the m ass of sodium hydroxide used in the experiment?[ R.A.M : Na = 23; O = 16; H = 1; assuming density of solution = 1 gcm"3; specific heat capacityof solution = 4.12 Jg-1K"1]

A 0,85 gB 2.75 gC 10.80 gD 12.99 g

15 The graph below shows the variation of pH when 10 cm3 of 0.1 mol dm"3 aqueous alkali istitrated against 0,1 mol dm"3 ethanoic acid.

Wh ich of the following statemen ts is no t correct?A The alkali used could be Ba(OH)2.B Phenolphtha!ein is a suitable indicator for the reaction.C A buffer solution is formed at point X.D The salt formed is alkaline.

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C O N F I D EN T I A L * 12

16 Pro pan one reac ts w i th iod ine in the prese nce o f an ac id .C H 3 C O C H 3 + I2 - > CH 3 C O C H 2 I + HI

I ts mechanism invo lved the fo l low ing s teps:C H 3 C O C H 3 > C H 3 C = C H slow

O HC H 3 C C H 2 + I2 > C H 3 CI - CH 2 I fast

O H O HC H 3 C I - C H 2 If > C H 3C O C H 2 I + Hl fastO H

Which conc lus ion canno t be d rawn f rom the above i n fo rmat i on?A Iod ine is not invo lve d in the ra te dete rmin ing s tep.B Th e react ion is un imo lecu lar .C Th e overa l l o rder o f react ion is 3 .D Th e ra te o f reac t ion is not a f fec ted by a cha ng e in the iod ine conce ntra t ion.

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CONFIDENTIAL* 14

17 Th e diagram represe nts the mel t ing points of four consecu tive elements in the th i rdperiod ofthe Periodic Table.

The sketches be low represent another two proper t ies o f the e lements .

What are the propert ies M and N ?Property M Property N

A Third ionisat ion energy Electronegativ i tyB Number o fva lence e lec t rons Boil ing pointC Ionic radius Effect ive nuclear chargeO Electrical conductivi ty Atomic radius

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CONFIDENTIAL* 15

17 Rajah di bawa h mewa ki l i takat Iebur bagi emp at unsure yang berturutan dalam kalaketiga di dalam Jadual Berkala.

Lakaran-Iakaran di bawah mewakil i dua Iagi si fat unsur-unsur ini

Apa kah si fat-s i fat M dan N ?Sifat M Sifat NTenaga pengionan ket iga Keelektronegati fan

B Bi langan elektron valens Takat did ihJejari ion Cas nuklear berkesanKekonduksian elektr ik Jejari atom



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CONFIDENTIAL* 1618 When heated to a temperature T0C1 NO 2 (g) dissociates into N 2(g) and 0 2(g).

2NO,(g) ^ N2(Q) + 20 2(g )

A mixture of 0.76 mol N0 2(g) and 0.26 mol N2(g) was heated to a temperature T0C in a 1.0 dm3flask. If 0.52 m ol N0 2(g) is present at equilibrium, what is the equilibrium constant, K c for theabove reaction?

A 0.04 mo! dm'3 C 0.18moldm-3B 0.08 mol dm"3 D 0.27 mol dm"3

19. The following diagra m shows the structural formula of a compound.CH3 H CH3 CHa

\ / \ /C=C C=C ^H CH2 CH2CH3

What is the total number of geometrical isomers (cis-trans) in this molecule?A 2 B 3 C 4 D 8

20. Which statement concerning the transition metals is correct?A They are the only metals which have more than one valency (oxidation state).B They are the only metals which give coloured ions in an aqueous so lution.C They are the only metals which the anhydrous chlorides have cova!ent bonds.D They are the only metals with a complete 4s orbital in their atoms.

21 Wh ich property of a group 14 element in the Periodic Table decreas es when the relativeatomic mass increases?A Basic property of the oxides.

B lonic property of its compou nds.C First ionisation energy.D Ease of hydrolysis of its tetrahalides,

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CONFIDENTIAL* 18

22 W hich of the fol lowing is no t disproportionation?A Cl2 + 2Na OH ^ NaCI + NaOCI + H 2OB Hg2CI2 H^ HgCI2 + HgC 2SiO ^ SiO2 + SiD 2KCIOa ^ 2KCI + 3 0 2

23 Wh ich o ft h e fo l lowing is no t a property of n i trogen gas?A It is inert.B Its melting point is high becau se o ft h e triple bond betwee n nitrogen atoms.C It has a high bond dissociation energy,D It is colourless and odourless.

24 Which statement cannot be explained by the polarizing power of aluminium ions?A The high boi l ing point for aluminium fluoride.B The am phote ric nature of aluminium hydroxide.C The covaient nature of aluminium chloride.D The acidic property of aqueou s aluminium salts.

25 W hich factors help to explain the increase in therm al stabil ity of the carbonates ofGroup 2 metals from m agnesium to barium?

Charge density of cation Relative polarisabi l ity of ca rbonateand oxide ions

A Increases CO3*" Iess than O 2B Increases O i' Iess than CO32"C Decreases CO32" Iess than O 2"D Decreases O 2 Iess than CO32"

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CONFIDENTIAL* 20

26 The comp lex ion [M(NH 3)2CI2]+ does not exhibit cis-trans isomerism. The shape ofthe complex is most Iikeiy

27 W hich of the fo l lowing is no t tru e about kaol in i te and montm ori lloni te?A Both are clay.B Both are layered structures.C Both can absorb cat ions.D Both have formula Ca 3AI2O 6.

28 2.30 g of methylbenzene reacts wi th chlor ine to give a com poun d X. Hydrolysis of Xin the presence of aqueous si lver nitrate yields 7.18 g of si lver chloride as whiteprecipitate according to the fol lowing reaction scheme.

A square planarC linear

B tetrahedralD trigonal bipyramida l

A g N 0 3 / H N 0 3Boiling > AgCI

Compound X cou ld be[Relative atomic mass: C= 12; H = 1;Ag = 108, Cl = 35.5; N 14]

A B

C D

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CONFIDENTIAL* 2229 Wh at type of react ion does cyclohexene undergo?

A Free radica l sub stitution B Electroph ilic additionC Nucleophi l ic addition D Nucleophi l ic substi tution

30 Experime nts are carried out on three com pound sP: CH 3CH 2CH 2CIQ: CH 3CH 2COCI1 andR: C 6H sCI

To 0.010 mol samples of each of P, Q and R 1 10 cm 3 of water is added and thesamples are shaken and kept at a fixed temperature for 24 hours.

An excess of aqueous si lver nitrate is then added to each sample and the si lverchloride produced is fi l tered off, washed, dried and weighed. The three samples of si lverchloride weighed 0.000 g, 0.014 g and 1.430 g.Which sequence of compounds matches these resul ts?

0.000 g 0.014 g 1.430 gA ~ P " Q R "B Q R PC R P QD R Q P



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CONFIDENTIAL* 2431 Asp artam e is an artificial sweetener used by diabetic patients. The structure ofaspartame is given below.

H O H OI Ii I IiH2N C c N 9 CO CH 3

CH2 HCOOH

Wh ich of the following is true of aspartam e?A It forms three different amino acids when hydrolysed completely.B It reacts with aqueous sodium hydroxide to give methanol as one of the

products.C It is optically inactive .D It is a polyam ide.

32 W hich of the following reage nts can react with all the three brom o com pound sbelow?

C 6H 5Br, C 2H 6Br and C 6H 5CH 2Br?

A Magne sium B Potassium cyanideC Alcoho lic silver nitrate D Am mo nia

33 Compound A, C 3H 7NO is neutral and reacts with nitrous acid to produce compound B 1C 3H 6O 2 and nitrogen. What could compounds A and S be?

Compound AA CH 3CONHCH 3B CH 3CH 2CONH 2C CH 3CONHCH3D CH 3CH 2CONH 2

Compound BCH3COOCH3CH3CH2COOHCH 3CH 2COOHCH3COOCH3



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CONFIDENTIAL* 2634 4-methy lpentan-2-one , M IBK is used as a solvent for a few types of glue. The molecular

structure of MlBK is(C H 3)2CHCH 2COCH3

W hich of the following is a particular test that is performed in MIBK ?A It will form an orang e precipitate when heated with Fehling's solution.B It is oxidised by potassium dich ro m at e^ l) solution and the colour of potassium

dichromateO/1) so lution changes to green.C It forms a yellow precipitate when heated with an alkaline iodine solutionD It produces a scent when heated with benzoic acid

35 W hich of the following mechanisms is most likely expe rienced by the carbon atomslabeled x, y and z?

x Y zA Free radical substitution Electrophilic addition Nucleoph ilic additionB Electrophilic substitution Nuc leophilic addition Electro philic subs titutionC Free radical subs titution Nuc leophilic addition NucIeo phiIic substitutionD Electroph ilic sub stitution Nuc leophilic addition Free radical subs titution

36 W hich one o ft h e following reagents can be used to distinguish between phenoland phenylmethanol?

A Aqu eou s bromine B Ethanoyl chlorideC Dilute hydrochloric acid D Fehling's solution



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CONFIDENTIAL* 2837 Wh ich o f the fo l low ing po lymers is produced by conden sat ion po lymer isat ion?

A Poly(e thene) B Polyam ideC Synthe t ic rubb er D Perspe x

38 The chlor inat ion of me than e occurs throu gh a series of steps. W hich of thefol lowing is not t rue ?

A Th e in i tiat ion ste p is endo therm ic.B Chtor ine free radicals are form ed in the in i tiat ion step.C On e of the produ cts is ethane .D Th e react ion wi l l only stop wh en al l the hyd roge n atom s in the methan e

molecu le has been rep laced by ch lor ine a toms.

39 W hic h of the fo l low ing is exp ected to give a wh i te precipitate wi th brom ine water?A C 2H 5N H 2 B


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CONFIDENTIAL* 17 3 0Sec t i on B

Four each question in this section, one or more of the three numbered statements 1o3may be correct. The responses A to D should be selected as follows:

A B C D1 only is correc t 1 and 2 only are

correct2 and 3 only are

correctT t 2 and 3 are

correct

41 An elemen t Y produced the fol lowing mass spectrumPercentageabundance

From the above mass spectrum, i t can be concluded that1 the nucleon numbe r of Y is 14.5.2 the relative atomic mass of Y is 14.254.3 the element Y has two isotopes with relative isotopic mas ses of 14 and 15.

42 A current of 20 A was passed through aqueous copper(l l ) sulphate for 40.6 minutesusing copper electrodes. It was found that the mass of the anode chang ed by 16.85 g.Wh ich of the fol lowing observa tions is/are true?[A of Cu = 63.5; Faraday constant = 96500 C mol"1]

1 The mass of th e anode increased by 16.85 g.2 The colour intensity of the electrolyte remained unchan ged.3 The copper anode is impure.

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CONFIDENTIAL* 32A B C D

1 only is correct 1 and 2 only arecorrect

2 and 3 only arecorrect

1, 2 and 3 arecorrect

43 In which of the following reactions is the bond angle in the product greater than inthe reactant?

1 H2O(I) + H +(aq) -^ H 3O + (aq)2 C0 2(g) + OH"(aq) - HC O3" (aq)3 C 2H 4 (g) + H 2 (g) -^ C 2H 6 (g)

44 The graph below shows how the percentage of reactant X(g) that rema ined in anequilibrium mixture varies with ^^[ at pressures of 1 atm and 2 atm. (T is the temperature inKelvin)

Which of the fol lowing can be deduce d from this graph?1 T h e e q u a t i o n fo r t h e a b o v e re a c t i o n c o u l d b e X (g ) - Y (g ) + Z (g ) .2 The forward reaction is endothermic.

3 The equilibrium constant K p increases as the pressure increases.



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CONFIDENTIAL* 34A B C D

1 only is corre ct 1 and 2 only arecorrect

2 and 3 only arecorrect

1, 2 and 3 arecorrect

45 The parti tion coefficient of X between ether and water is 8.0 at room conditions.Given that 100 cm 3 of th e aqu eous solut ion which contains 5.00 g of X is extracted byusing 100 cm 3 of ether. Hence, i t can be co ncluded that

1 X is more soluble in ether than water,2 the mass of X extracted is 4.44 g.3 the concentration of X remaining in water is 5.60 gdnY3.

46 W hich of the fol lowing about catalyst is correct?1 It increases the rate constant of a reaction.2 It does not cha nge che mical ly at the end of the reaction.3 It change s the enthalpy of reaction.

47 The e.m.f of a Daniell cell can be increased by, 1 decreasing the concen tration of Zn2+ .

2 increasing the conce ntration of Cu 2+ .3 increasing the volum e of the Cu 2+ ionic solution.

48 Ethene reacts with hydrog en halide, HX, according to the equation:CH 2 = CH 2 + HX ^ CH 3CH 2X

in the reaction1 n electrons a re used to form a bond with the hydrogen atom from H X.2 the intermediate is CH 3 - CH2*.3 the reactivity increa ses in the order HF < HBr < HCI < HI.



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stpm johor chemistry paper 1 2011 trial (edu.joshuatly) edu.joshuatly

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