STPM Trials 2009 Chemistry Paper 1 Terengganu

8/3/2019 STPM Trials 2009 Chemistry Paper 1 Terengganu

1/14

Name : NRIC :

JABATAN PELAJARANTERENGGANUJABATANPELAJARAN TERENGGANUJABATANPELAJAR



JABATAN PELAJARANTERENGGANUJABATANPELAJARAN TERENGGANUJABATANPELAJARJABATAN PELAJARANTERENGGANUJABATANPELAJARAN TERENGGANUJABATANPELAJAR











JABATAN PELAJARANTERENGGANUJABATANPELAJARAN TERENGGANUJABATANPELAJARJABATAN PELAJARANTERENGGANUJABATANPELAJARAN TERENGGANUJABATANPELAJAR









Instructions to candidates :

DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.

There are fifty questions in this paper. For each question, four suggested answers are given.

Choose one correct answer and indicate it on the multiple-choice answer sheet provided.

Read the instructions on the multiple-choice answer sheet very carefully.

Answerall questions.Marks will not be deducted for wrong answers.The total score for this

paper is the number of correctly answered questions.

This question paper consists of 14 printed pages.

TRIAL

STPM 2009

CHEMISTRYPAPER 1

One hour and forty-five minutes

962/1

JABATAN PELAJARAN

NEGERI TERENGGANU


2/14

STPM 962/1 OTI 2 2009 SULIT*(CONFIDENTIAL*)

STPM 962/1 OTI 2 2009 [Lihat sebelah(Turn over

Kertas soalan ini SULIT sehingga peperiksaan ini tamat SULIT*(CONFIDENTIAL*)

2

Section A

Four suggested answers labelledA, B, CandDare given for each question.

Choose one correct answer.

1 The mass spectrum of iron shows peaks at mass number of 54, 56, 57, and 58.This shows that

A The atoms of iron have different numbers of neutron

B The sample of iron is radioactive

C The sample of iron is not pure

D The atoms of iron have different numbers of proton

2 Which of the following gases is most likely to exhibit ideal behavior?

A NH3 C CO2

B C4H10 D H2

3 The phase diagram for carbon dioxide is shown above. Which of the following statements is

not true?

A The melting point of carbon dioxide increases with an increase in pressure.

B Solid carbon dioxide is denser than liquid carbon dioxide.

C Solid, liquid and gaseous carbon dioxide cannot exist in equilibrium at 1.0 atm.

D Carbon dioxide can be solidified at 1.0 atm by greatly reducing the temperature.

4 The electronic configuration of the outermost shell of an element is 3s2 3p1. What is the

proton number for this element?

A 3 B 11 C 13 D 15

P/atm

-57 374 T/OC

217

5.1


3/14




3

5 Which of the following has the biggest radius?

A F B Cl

C Na

+ D Al

3+

6 The information below describes an element, T.

Melting point is 44OC Produces acidic oxides Monatomic in solid

Element Tcould be

A Fluorine C Magnesium

B Sodium D Phosphorus

7 The graph shows a property when going across period three. What could the property be?

A Atomic size

B Ionization energy

C Electric conductivity

D Boiling point

8 Which of the following molecules will not form a hydrogen bond with another similar

molecule?

A C6H5OH

B CH3NH2

C CH3CHO

D NH3

Proton number

Property


4/14




4

9

Valence

band

Conductor

band

The diagram shows the conductor and the valence bands. Which of the following elements

can be represented by the diagram shown?

A Carbon C Neon

B Magnesium D Oxygen

10 The shape of a molecule depends on the following factors, except

A The number of lone-pair electrons

B The number of bond-pair electrons

C The number of attractions between the electron orbitals

D The number of atoms bonded to the central atom

11 A chemist sketched a graph as shown below.

Which of the following reactions can be represented byb the graph above?

A Esterification C Sulphonation

B Nitration D Neutralization

12 Which of the following is true about the half life of a first order reaction?

A The half life is longer for a catalyzed reaction.

B The half life is shorter when pressure increase.

C After the fourth half life, the percentage of the remaining element

is 6.25% of the original quantity.

D The half life is influenced by the concentration of the reactant.

Time

Rate of reaction

Reactant

Products


5/14




5

13 The dissociation of dinitrogen tetroxide into nitrogen dioxide is represented by the equation

below.

If the temperature of an equilibrium mixture of the gases is increased at constant pressure ,

the volume of the mixture will

A Increase, but only because of a shift of equilibrium towards the right

B Increase, both because of a shift of equilibrium towards the right and also because of

thermal expansion.

C Stay the same, because any thermal expansion could be exactly counteract any

thermal expansion

D Decrease, because a shift of equilibrium towards the left would more than counteract

any thermal expansion.

14 Public swimming pools are often chlorinated to kill bacteria. As an alternative to chlorination

silver ions can be used in a concentration of not more than 10-6

moldm-3

and not less than

10-7

moldm-3

of silver ions.

Which of the following compounds would, in saturated solution, provided the necessary

concentration of silver ion?

compound solubility product

A AgBr 5 x 10-13

mol2dm

-6

B AgCl

2 x 10-10

mol2dm

-6

C AgIO3 2 x 10-8

mol2

dm-6

D Ag2SO4 2 x 10

-5mol

3dm

-9

15 Distillation of a mixture of bromobenzene (C6H5Br) and steam at a pressure of 101kPa and

a temperature of 95oC gave a distillate containing 100g water. The vapour pressure of water

at 95oC is 85 kPa. What is the percentage by mass of bromobenzene in the distillate?

(RMM C6H5Br = 156.5 ; H2O = 18.0)

A 50%

B 62%

C 76%

D 100%

16 Some data relating to magnesium and its compounds are as follows?

standard electrode potential of magnesium = -2.38V

melting point of magnesium oxide = 2850o

C

melting point of magnesium chloride = 714o

C

What is the most suitable method for extracting magnesium metal from its ores?

A Electrolysis of aqueous magnesium chloride

B Electrolysis of molten magnesium chloride

C Electrolysis of molten magnesium oxide

D Reduction of magnesium oxide with carbon

N2O4 (g) 2NO2 (g) Ho

= + 57.2 kJmol-1


6/14




6

17 A current of 8A is passed through molten aluminium oxide using inert electrodes.

What will be the approximate volume of gas liberated, measured at s.t.p ?

A 2.8 dm3

B 5.6 dm3

C 8.4 dm3

D 11.2 dm3

18 Which one of the following equation correctly defines the enthalpy change of formation

of carbon monoxide?

A C(s) + O2(g) CO(g)

B C(s) + O (g) CO(g)

C C(g) + O2(g) CO(g)

D C(s) + CO2(g) 2CO(g)

19 The enthalpy changes of formation of gaseous ethane and gaseous ethane are 52 kJmol-1

and 85 kJmol-1

respectively at 298K.

What is the enthalpy change of reaction at 298K for the following process?

C2H4(g) + H2(g) C2H6(g)

A -137 kJmol-1

B -33 kJmol-1

C +33 kJmol-1

D 137 kJmol-1

20 Four isomers of C6H12 are shown below.

Which of the following pairs consists of a pair of cis-trans isomers?

A 1 and 2 C 1 and 4

B 1 and 3 D 2 and 4

CH

CH

C C

H C2H5

CH3 C2H5

C

H CH3

C2H5 H

CH3CH3

C C

C2H5 CH3

H CH3

C C


7/14




7

21 Which one of the following is a correct statement about the two alkenes

CH3CH2CH=CH2 and CH3CH=CHCH3?

A Neither exhibits cis-trans (geometrical) isomerism.

B Neither may be polymerized

C Neither reacts with bromine to give 1,4-dibromobutane

D Neither reacts with hydrogen to form butane.

22 Which one of the following reagents could best be used to distinguish between hex-1-ene and

methylbenzene?

A Ag(NH3)2+

in H2O

B Br2 in CCl4

C I2 in NaOH

D 2,4-dinitrophenylhydrazine in CH3OH

23 Compound G has the molecular formula C8H9C1. When compound G is heated with acidified

potassium manganate(VII), a compound with the molecular formula C8H6O4 is formed.

Compound G is most probably

24 Complete the following reaction equation.

A C

B D

`Ethanoyl 2-hydroxybenzoic

chloride acid

A

B

C

D


8/14




8

25 Aldehyde and ketone are produced through catalytic oxidation of alkenes. One example of thereaction scheme is shown below where ethanal is produced from the oxidation of ethene.

Based on the scheme above, the product

formed from catalytic oxidation of but-2-ene is

A CH3CH2CHO

B CH3CH2CH2CHO

C CH3COCH2CH3

D CH2COCH3

26. A reaction between compound P, CH3COCH2CO2CH2CH3 and phenyihydrazine is the firststep in synthesizing Antipyrine, a type of medicine used to control fever. The reaction scheme

is as follows.

What could Q be?

27. Why is ethanoic acid a stronger acid in liquid ammonia than in water?

A Ammonia is a stronger base than water.

B The molecules of ethanoic acid form a hydrogen bond with water.

C Ethanoic acid dissolves better in liquid ammonia than water.

D Ethanoic acid has a higher enthalpy of hydration.

28 Ethanol is more soluble in water when compared to ethyl ethanoate. Why is this?

A Ethanol is a polar molecule whereas ethyl ethanoate is not polar.

B Ethanol is not polar whereas ethyl ethanoate is polar.

C Hydrogen bonds are formed between the ethanol and water molecules.

D Hydrogen bonds are formed between ethyl ethanoate molecules.

A

B

C

D


9/14




9

29 Which of the following compounds produces a white precipitate with ammonia?

30.

Reagent R is most probably

A Ammonia nitrateB Ethanamide

C Alcoholic ammonia

D Methylamine

31 In an experiment, diluted hydrochloric acid was added to 2-aminopropanoic acid until the pH

of the solution is 2. What is the shape of 2-aminopropanoic acid molecule that exists at this

pH?

32 The scheme shows

A cationic polymerisation

B anionic polymerisation

C coordination polymerisation

D condensation polymerization

A C

B D

A C

B D


10/14




10

33 Which of the following forms an ionic hydride?A Sodium

B Silicon

C Sulphur

D Chlorine

34 Aqueous aluminium chlorine has a pH less than 7 becauseA the charge density of the aluminium ion is high.

B the aluminium ion undergoes hydrolysis

C aluminium chloride undergoes partial dissociation in water.

D aluminium chloride is a covalent compound.

35 A tetrachloride of Group 14, XCl4 has the following properties.(i) It is easily hydrolysed.(ii) Unstable to heat.(iii) Decomposes at room temperature according to the equation

XCl4 XCl2 + Cl2X could be

A germanium

B carbon

C silicon

D lead

36 Which of the following best explain the decreasing thermal stability of the chlorides andoxides in the oxidation state of +4 of the Group 14 elements (carbon to lead ) in the Periodic

Table when descending the group?

A The bond energy increases.

B The first and second ionization energy decreases.

C The standard electrode potential decreases.

D Presence of the inert pair effect of the s orbital electrons.

37 Which of the following is correct regarding dinitrogen tetroxide, N2O4?A It is polar.

B It has a V shape

C It is produced from NO2.

D It contains one unpaired electron.

38 Which of the following is true with regards to the ammonia molecule?A It is non-polar molecule.

B It has a trigonal planar shape

C The H N H bond angle is 107o.

D It contains two lone pairs of electrons.


11/14




11

39 The scheme below shows the reactions between potassium iodide with hot concentratedsulphuric acid, and with aqueous siver nitrate, as well as the solubility of the precipitate Yin

concentrated aqueous ammonia.

Which of the following is correct with regards to the colour of vapourX, colour of the

precipitate Y, and the solubility ofY, in concentrated ammonia?

40 Which of the following statements helps to explain why nickel can act as a catalyst in thehydrogenation of ethene at 200

oC according to the equation :

H2C = CH2 (g) + H2 (g) CH3CH3 (g)

A Nickel can exhibits variable oxidation states.

B Nickel has dorbitals that can form temporary bonds.

C Nickel can form stable intermediate with the reactants.

D Nickel is neutral in the hydrogenation process of H2C = CH2 .

Colour ofX Colour ofY Solubility ofY, in conc. NH3

A Brown White Soluble

B Purple Yellow Soluble

C Purple White Insoluble

D Purple Yellow Insoluble

Conc. H SOVa ourX

Product

heat

Conc. NHAgNO3 (aq)

KI s

Precipitate Y


12/14




12

Section B

For questions41 through 50, 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 correct. 1 and 2 only are

correct.

2 and 3 only are

correct.

1, 2 and 3 only

are correct.

41 Which of the following depends on the number of solute particles in a given mass of solvent?

1 Elevation of boiling point of solvent

2 Depression of freezing point of solvent

3 Vapor pressure of solute

42 Hydroxyapatite, Ca5(PO4)3OH is the main constituent of tooth enamel . In the presence of

saliva, the following equilibria exist.

Which of the following statements help to explain why tooth enamel is dissolved more

readily when saliva is acidic?

1 The hydroxide ions are neutralised by the acid2 The phosphate ion PO42- (aq) accepts H+ (aq)3 Calcium ions react with acids

43 The dissociation constants, Ka, for three acids are given below:

Acid Ka (moldm-3

)

phenylethanoic acid 4.90 x 10-5

3-hydroxybenzoic acid 8.32 x 10-5

2-chlorobutanoic acid 1.15 x 10-3

Which of the following statement is/are correct about the acid?

1 Ka for 2,2-dichlorobutanoic acid is greater than Ka for 2-chlorobutanoic acid2 [H+] in 1.00 moldm-3phenylethanoic acid solution is 4.90 x 10-53

3-hydroxybenzoic acid is the strongest acid

Ca5(PO4)3OH (s) 5Ca2+

(aq) + 3PO43-

(aq) + OH-aq)

HPO42-

(aq) H+

(aq) + PO43-

(aq)


13/14




13

44 Under which of the following conditions would the Partition Law not hold?

1 When the solutions are concentrated2 When the solute dissociate or associate in the solvents3 When the temperature changes

45 Which pairs of compounds can react to produce a compound with the following

structural formula?

1

2

3

46 Which of the following compounds can be used to prepare diazonium salt when reacted with

nitric acid(III)?

1

2

3

47 Which of the following statements explain the increasing thermal stability of the carbonatesof the Group 2 elements (beryllium to barium) when descending the group?

1 When the solutions are concentrated2 When the solute dissociate or associate in the solvents3 When the temperature changes

48 Which of the following aqueous cations would give a precipitate when excess ammonia isadded to it?

1 Al3+

2 Zn2+

3 Cu2+


14/14




14

49 In the diaphragm cell for the manufacture of chlorine by elavtrolysis of brine. The function ofthe diaphragm

1 is to separate the anode compartment from the cathode compartment.2 is to prevent the reaction between chlorine and sodium hydroxide produced.3 Is to act as catalyst to speed up the electrolysis process.

50 A complex salt with the formula of [Ni(NH3)x(H2O)y]Cl2 has the composition by mass ofnickel, 13.98%; and hydrogen, 3.79%. Which of the following statements are true with

regards to the complex salt?

1 The ratio ofx toy in the formula of the salt is 2:1.2 The name of the complex salt is diaquatetraamminenickel(II) chloride.3 The cis isimer of the complex is optically active.

END OF QUESTION PAPER

STPM Trials 2009 Chemistry Paper 1 Terengganu

Documents

Transcript of STPM Trials 2009 Chemistry Paper 1 Terengganu