Ujian Setara 2 Ogos 2008

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SULIT 4541/14541/1KimiaUJIAN SETARA 2Ogos 20081jam

SEKOLAH MENENGAH TEKNIK KUALA SELANGORKEMENTERIAN PELAJARAN MALAYSIA

UJIAN SETARA 2

KIMIA

Satu jam

JANGAN BUKA KERTAS SOALAN INI HINGGA DIBERITAHU

1. Jawab semua soalan2. Jawapan boleh ditulis keseluruhannya samada dalam Bahasa Melayu atau Bahasa Inggeris.3. Anda dibenarkan menggunakan kalkulator saintifik yang tidak boleh diprogramkan.4. Jawapan hendaklah ditulis di dalam kertas jawapan yang disediakan sahaja.

Soalan ini mengandungi sebanyak 11 muka surat bercetak

4541 Kimia 1 lihat sebelah

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Section A

1 Which of the following is a chemical formula of ammonium sulphate?

ABCD

NH4SO4

(NH4)2SO4

(NH3)2SO4

(NH4)3(SO4)2

2 Elements in the Periodic Table are arranged according to an increase in

ABCD

proton numbernucleon numberrelative atomic massrelative molecular mass

3 Which of the following substances is a covalent compound?

ABCD

CopperAmmoniaLead(II) oxideSodium chloride

4 Which of the following substances is an electrolyte?

ABCD

Hydrogen chloride in methyl benzeneMolten aluminium oxideGlucose solutionCopper(II) carbonate powder


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5 Which of the following is the atomic structure of lithium atom,

A B

C D

6 The figure shows three elements in Period 3 of the Periodic Table.

X Y Z

Which of the following is true about the properties of oxide formed?

ABCD

The oxide of Z is basicThe oxide of Y is acidicThe formula of oxide Y is YOThe oxide of X reacts with an acid to form salt and water

7 Which of the following substances is made up of ions?

ABCD

SulphurNaphthaleneSulphur trioxidePotassium chloride

8 Which of the following ions are present in copper(II) sulphate solution?

ABCD

Hydrogen ions and hydroxide ionsCopper(II) ions and sulphate ionsCopper(II) ions ,hydrogen ions, suphide ions and oxide ionsCopper(II) ions, hydrogen ions, sulphate ions and hydroxide ions


3p 3p

4p 4p

7

3Li

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9 The number of valence electrons of atoms X and Y are 2 and 7 respectively.Which of the following chemical formulae and types of bonding are true for the compound formed between X and Y?

Chemical Formula Type of Bonding

A XY2 ionic

B XY2 covalent

C X2Y ionic

D X2Y covalent

10 34 g of ammonia consists of[Relative molecular mass of ammonia = 17, Avogadro constant = 6.02 x 10 23 mol-1]

I. 2 mole of nitrogen atoms

II. 2 mole of ammonia molecules

III. 1.204 X 1024 molecules

IV. 5 mole of hidrogen atoms

A I and II only

B I, II and III only

C II, III and IV only

D I, II, III and IV

11 Profesional cyclists usually fill their bicycle tyres with gas which makes the bicycle lighter.

Which of the following elements X, Y, W and Z in the Periodic Table is suitable to be used in bicycle tyres?

A X

B Y

C W

D Z


XY W

Z

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12 Why does an element form chemical bonds?A Its electropositive is high.B It is very reactive with other elements.C It contains many electrons which take part in reactions.D It contains less than eight valence electron

13 Which of the following substances have ionic bonds?A BromineB Carbon dioxideC Potassium iodideD Copper

14 An element T reacts with bromine to produce respectively TBr3. The electron arrangement of T isA 2.8.3B 2.8.8C 2.8.8.1D 2.8.8.7

15 Which of the following molecules form covalent bonds sharing two pairs of electron?.I. Cl2

II. CO2 III. C2H4 IV. N2

A II and III onlyB I, II and III onlyC II, III and IV onlyD I, II, III and IV

16 Ionic compounds do not conduct electricity in the solid state because

A every valence electron forms bonds with each other.B the ionic bonds prevent ions from moving freely.C they consist of particle which are negatively charged.D they consists of electrons which move about freely.

17. Which of the following are electrolytes.I. concentrated sulphuric acid.II. aqueous sodium hydroxide solution.III. limewaterIV. zinc sulphate powder

A 1 and IV onlyB II and III onlyC I, II and III onlyD II, III and IV only.


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18. During electrolysis, which of the following energy change occurs?.

A Electrical → chemicalB Electrical → lightC Chemical → Electrical D Chemical → heat

Section B

1. Diagram 1 shows part of the Periodic Table of Elements. A, B, C, D, E, F, G and H do not represent the actual symbol of the elements.

AB C D

E F G

Table 1

Using the letters in the Periodic Table of Elements in Diagram 2, answer the following questions.

(a) (i) Write the electron arrangement of atom F. ……………………………………………………….........……………………................................

[1 mark](ii) Give the formula of ion F.

……………………………………………......................................……………………………...... [1 mark]

(b) Arrange the elements A, B, C, D, E, F and G according to the atomic size in ascending order. …………………………………………………………………...............................………………...........

[1 mark](c) Element A exists as a monoatomic gas. Explain why. ………………………………………………...............................…………………………………..........

[1 mark] (d) Element D is more reactive than element G. Explain why. …………………………………………………………………………...............................………...........

…......……………………………………………………………………...............................……............. [2 marks]


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(e) E reacts with D to form a compound. (i) What is the type of the compound formed? ………………………………………………………………………. …................................

[1 mark]

(ii) Draw the diagram of electron arrangement for the compound formed.

[2 marks]

(iii) State one physical property of the compound formed.

…………………………………………………………………………..................................

[1 mark]


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2.

Substance Melting point (o C) Boiling point (o C)Ethanol -117 78

Calcium oxide 2580 2850

Copper 1080 2600

Graphite 3730 4836

Table 2

Table 2 shows the melting and boiling points of some substances.

(a) Which of the substances above is(i) an ionic compound?

..................................................................................................................................................................

[1 mark](ii) a simple covalent molecules?

..................................................................................................................................................................[1 marks]

(iii) a giant covalent molecules?

..................................................................................................................................................................[1 mark]

(b) (i) Which of the substances cannot conduct electricity in the solid, molten and aqueous states?

.................................................................................................................................................................. [1 mark]

(ii) Explain your answer in b(i) above.

..................................................................................................................................................................[1 mark]

(c) Why does ethanol have low melting point and boiling points?.

..................................................................................................................................................................[1 mark]

(d) What particles are present in calcium oxide and explain how these particle are formed?.

.................................................................................................................................................................

.................................................................................................................................................................[2 marks]


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(e) Explain why graphite has such high melting and boiling points even though it is covalent bonding?

..................................................................................................................................................................

..................................................................................................................................................................[2 marks]

(f) Which of the substances above is not ionic or covalent and state the particle present in it?.

..................................................................................................................................................................

..................................................................................................................................................................[2 marks]

Section C

3.(a) The Table 3 below shows the proton numbers of two elements, X and Y.

Element Proton number

X 1

Y 11

Table 3

Explain how both X and Y can react with a named element in Group 17 to form two different types

of compound. In you explanation, attach any useful diagram.

[11 marks]

(b) (i) State two properties of an ionic compound.

(ii) Describe an experimen, using electrical energy, how you prove that one of the

compounds formed in (a) is an ionic compound. Explain how you arrive at the

conclusion.

[9 marks]


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END OF QUESTION PAPER

Answer Booklet

Section A1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

Total marks

Section C


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Ujian Setara 2 Ogos 2008

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