STPM Che1 (Sbh)

8/14/2019 STPM Che1 (Sbh)

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Coordinator

Datin Azizah

Sektor Pengurusan Akademik

JPN Sabah

List of Contributors

No. Name School

1. Yeo Peck Cheng SMK Datuk Peter Mojuntin, PENAMPANG2. Mokhtaruddin Harun SMK Tamparuli,TAMPARULI

3. Goh Siew Goik SM La Salle, KOTA KINABALU

4. Nor Hanifah Jaraie SMK Maktab Sabah, KOTA KINABALU5. Patricia Yahin SMK Mat Salleh, RANAU

6. Pang Kee Wen SMK Maktab Sabah, KOTA KINABALU


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Section A

Four suggested answers labeledA, B, C, andD are given for each question. Choose one

correct answer.

1 Ascorbic acid (vitamin C) cures scurvy and may help prevent the common cold. It is

composed of 40.92% carbon, 4.58% hydrogen and 54.50% oxygen by mass.

Determine its empirical formula.[relative atomic mass of C=12;H=1;O=16]

A C3H4O3B C2H3O2

C C4H5O4

D C8HO12

2 Calculate the relative atomic mass of naturally occurring Renium from the following

data:Isotope Relative mass Relative abundance

Renium-185Renium-187

184.95186.96

37.0762.93

A 185.02

B 185.72

C 186.21

D 187.03

3 Which of the following elements does not have a p electron that is paired ?

Element Proton number

A Carbon 6

B Oxygen 8

C Neon 10

D Magnesium 12

4 A small bubbles rises from the bottom of a lake, where the temperature and pressure

are 8oC and 6.4 atm, to the waters surface, where the temperature is 25

oC and

pressure is 1.0 atm. Calculate the final volume (in cm

3

) of the bubble if its initialvolume was 2.1 cm3

A 0.35

B 12.7

C 14.0

D 42.0


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5 What is the maximum number of emission lines possible for a hydrogen atoms withelectronic energy levels of n=1, n=2 and n=3?

A 1

B 2

C 3

D 4

6 The consecutive ionisation energies, in kJ/mol, of an element are as follows940 (first), 2080, 3090, 4140, 7870, 16000, 19500

In which group of the periodic table is the element likely to occupy?

A Group 13

B Group 14

C Group 15

D Group 16

7The ionic radii of sodium, magnesium and aluminium are 0.098nm, 0.065nm and0.045nm respectively. Which of the following statements explains the decrease in

magnitude of ionic radii for the third period elements (Na to Al)

AThe total number of electrons and the total number of protons in the nucleusincrease

B The total number of electrons and the total number of protons in the nucleusdecrease

CThe total number of electrons increase, whereas the total number of protons in

the nucleus remain constant

DThe total number of electrons remains constant, whereas the total number ofprotons in the nucleus increases.

8 The table below shows the proton numbers of four elements represented by letterswhich are not the usual symbols for the elements concerned

Element W X Y Z

Protonnumber

3 11 13 19

Which element has the strongest metallic bond

A W

B X

C Y


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13 Stomach juices have a pH of 1.0 . Aspirin is a monobasic acid represented by HA

(Ka = 10-4

mol dm-3

) which dissociates into ions H+

and A-

. What are the relative

concentrations of H+

, A-and HA when aspirin from a tablet enters the stomach?

A [H+] > [HA]>[A

-]

B [HA]> [H+] = [A

-]

C [H+] >[A

-]> [HA]

D [H+] = [A

-] >[HA]

14 Which of the following statements is correct about a reaction for which theequilibrium constant is independent of temperature?

A The rate constant do not vary with temperature.

B There are equal numbers of moles of reactants and products.

C The enthalpy change is zero

D The forward and reverse reactions are of the same order.

15 The pKb value for aqueous ammonia at 25oC is 4.8 . What is the correct pKa value

for the ammonium ion at this temperature?

A 4.8

B 2.2

C 9.2

D 9.6

16 The solubility product of silver chloride is 1.0 x 10-3

mol2

dm-6

. How many molesof silver chloride will dissolve in 1 dm

3of a solution of sodium chloride of

concentration 0.10 mol dm-3

?

A 1.0 x 10-14

mol

B 1.0 x 10-16

mol

C 1.0 x 10-9

mol

D 1.0 x 10-5

mol


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18 In the transformation of compound X to compound Z, it is discovered that itinvolves compound Y. The stages involved are,

XY H

= positive

YZ H

= negative

Which of the following profiles is appropriate with the data above?

A C

B D

19 An element X liberates hydrogen from dilute hydrochloric acid as well as from

aqueous sodium hydroxide. X could be

A Aluminium

B Lead

C Sulphur

D Carbon

17Which of the following is always true for an endothermic reaction?

A The reaction can take place at room conditions

B The rate of reaction at room conditions is slow

C The reaction is reversible

D Heat is absorbed from the surroundings


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24 In industry, nitric acid is obtained from ammonia by which of the following

processes?

A Hydrolysis

B Condensation

C Catalytic oxidation

D Hydrogenation

25 Which one of the following explains why the volatility of group 17 elements

(chlorine to iodine) of the Periodic Table decreases on descending the group?

A The enthalpy of vapourisation decrease

B The melting and boiling points increase

C The number of electrons increase

D The strength of intermolecular forces increase.

26 Which is the correct definition of a transition element?

A An element with incompletely filled d-sub-shells.

B An element that exhibits variable oxidation states.

C An element that forms ions with incompletely filled d-sub-shells.

D An element that forms coloured complexes.

27 What is the number of faradays needed to produce 24 cm3

of gas at the anodeduring the electrolysis of dilute sulphuric acid?

[1 mole of gas occupies 22.4 dm3

at s.t.p]

A 0.01 F

B 0.02 F

C 0.03 F

D 0.04 F

28 Among the following, which is the strongest acid?

A CH3NH2

B CH3CH2NH2

C NH3


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D C6H5NH2

29 Which of the following is an intermediate in the reaction between methane and

chlorine in the presence of light?

A CH3

+

B Cl

C CHCl3

D CH2Cl

30 Which of the following statements concerning the alkenes,Xand Yare correct?

CH3CH2CH = CH2 and CH3CH = CHCH2

X Y

A BothXand Yshow cis-trans isomerism.

B BothXand Y have the same boiling point.

C BothXand Yreact with bromine to form 1, 2-dibromobutane.

D Under suitable conditions,Xand Yreact to form a polymer.

31 When P (a gas) reacts with Q, a mixture of CH2BrCH2Br and CH2BrCH2OH are

produced.Pand Q are probably

P Q

A ethene bromine water

B ethene sodium bromide solution

C HBr(g) ethene

D Br2 vapour ethene

32 Which of the following would react with 2,4-dinitrophenylhydrazine as well as

alkaline iodine?

A CH3CHO

B CH3COCH3

C

D CH3CH2CHO

COCH3


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33 All the following reagents can be used to distinguished propanone from propan-1-ol

except

A Iodine and aqueous sodium hydroxide

B Tollens reagent

C Acidified potassium manganate(VII)

D 2,4-dinitrophenylhydrazine

34 The cleavage of the C-O bond in ethanol involves specific reagents and reaction

conditions. Which of the following reagents and reaction conditions is true of thereaction?

A K2Cr2O7/H+, heat

B Sodium metal, room temperature

C Concentrated H2SO4 (excess), heat

D CH3COOH, concentrated H2SO4, reflux

35 Which of the following reaction produces ethanol?

A Ethyl ethanoate and lithium tetrahydridaluminate

B Methyl ethanoate and hot concentrated sulphuric acid

C Ethane and dilute aqueous potassium manganate(VII) solution

D Chloroethane and ethanolic sodium hydroxide solution

36 Which of the following statement is not true about 2-iodo-2-butene?

A All the carbon atoms are planar

B It will decolourise bromine in CCl4

C It is stabilized by the delocalized pi electron system

D It has a higher boiling point then 2-chloro-2-butene


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37 An organic compound Q reacts with hydrogen cyanide to produce a compound which

on hydrolysis with dilute hydrochloric acid produces a compound with the structural

formula of H|

RCCOOH|

H

To what class of compound does Qbelong to?

A Aldehyde

B Ketone

C Carboxylic acid

D Ester

38 Which of the following compounds could be the product of a reaction involving anucleophilic attack by cyanide ions in aqueous ethanolic solution?

A CH2 = CHCN

B (CH3)2CHCN

C C6H5CN

D CH3CONH2

39 GABA is a neuro-transmitter released by red algae which encourages shellfish larvaeto settle on the ocean bed

GABA has the structural formula as shown below

H2NCH2CH2COOHIn what way does GABA differ from amino acid obtained by the hydrolysis of

protein?

A It does not form a zwitterion

B It is not soluble in water

C It is not a 2-aminocarboxylic acid

D It does not form a polyamide linkage.

40 Which of the following pairs of monomers could undergo condensation

polymerisation?

A CH3CH=CH2 and HOCH2CH2OH

B ClCO(CH2)COCl and H2N(CH2)4NH2


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C CH3COOH and C2H5OH

D CH2=CH(CH3)CH=CH2 and CH2=CHCl

Section B

For each of the questions in this section one or more of the three numbered statements 1

to 3 may be correct. Decide whether each of the statements is or is not correct. The

responses A to D should be selected on the basis of the following.

A B C D

1 only

is correct1 and 2

are correct2 and 3 only

are correct.1 , 2, and 3

are correct.

41 Which of the following statements are correct?

1 In crystalline solids, particles are held rigidly together by strong attractiveforces in a three dimensional orderly structure called the lattice structure

2 In amorphous solids the particles are not arranged in an orderly fashion

3 All solids are denser than liquids

42 Which of the following species do not have a tetrahedral shape?

1 PH4+

2 ICl4

3 XeF4

43 Which of the following statements are true for hydrogen bonding?

1 It is cause for the high melting of water

2 It is responsible for ice being less dense than water

3 It is responsible for the high enthalpy of vapourisation of water


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A B C D

1 only

is correct1 and 2

are correct2 and 3 only

are correct.1 , 2, and 3

are correct.

44 The diagram below shows the vapour pressure-composition graph for the ideal

mixture of benzene and toluene at 20oC.

Which of the following statements is true of a mixture which contains 40 % of

benzene at 20oC?

1 The partial vapour pressure of benzene is 4.0 kPa

2 The partial vapour pressure of toluene is 1.8 kPa

3 The partial vapour pressure of the mixture of benzene and toluene is 13 kPa

45 The e.m.f of the cell

depends on the

1 pressure of the hydrogen gas.

2 concentration of the H+ ions.

3 concentration of the Zn2+

ions

46 Which of the following statements about PbCl4 are correct?

1 Its molecule is tetrahedral in shape

Pt(s) / H2(g) , H+(aq) // Zn

2+(aq) / Zn (s)


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2 It is a liquid at room temperature

3 It readily decomposes to Pb and Cl2 on heating

A B C D1 only

is correct

1 and 2

are correct

2 and 3 only

are correct.

1 , 2, and 3

are correct.

47 In which of the following reactions does ammonia react as a base?

1Formation of a blue precipitate when ammonia gas is bubbled though aqueous

copper(II) sulphate

2 Reaction of ammonia gas with excess chlorine to form nitrogen trichloride

3 Formation of a dark blue solution when excess aqueous ammonia is added to

solid copper(II) hydroxide

48 Malic acid, HOOCCH(OH)CH2COOH is found in apples.

Which of the following is true about malic acid?

1 It has one chiral centre

2 It has a secondary alcohol

3 It form esters with ethanoic acid or with ethanol

49 Ethyl butanoate is used as an artificial pineapple flavoring. Which of the following

pairs can be used to produce the ester?

1 CH3CH2CH2COOH and CH3CH2OH

2 CH3CH2CH2COCl and CH3CH2OH

3 CH3CH2COOH and CH3CH2CH2OH

50Which of the following react with both phenylamine and aminocyclohexane?

1 Ethanoyl chloride

2 Bromine water

3 Sodium hydroxide

END OF QUESTION PAPER

STPM Che1 (Sbh)

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