Skema Pemarkahan Ujian Setara 2 - Ogos 2008

8/14/2019 Skema Pemarkahan Ujian Setara 2 - Ogos 2008

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4541 Kimia SULIT

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SULIT 4541/14541/1

KimiaUJIAN SETARA 2Ogos 20081jam

SEKOLAH MENENGAH TEKNIK KUALA SELANGOR KEMENTERIAN 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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4541 Kimia SULIT

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Section A

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

ABCD

NH 4SO 4(NH 4)2SO 4(NH 3)2SO 4(NH 4)3(SO 4)2

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

AB

CD

proton number nucleon number

relative atomic massrelative molecular mass

3 Which of the following substances is a covalent compound?

ABCD

Copper AmmoniaLead(II) oxideSodium chloride

4 Which of the following substances is an electrolyte?

ABCD

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

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

ABCD

Sulphur NaphthaleneSulphur trioxidePotassium chloride

6 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



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4541 Kimia SULIT

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

A B

C D

8 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

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 compoundformed between X and Y?

Chemical Formula Type of Bonding

A XY 2 ionic

B XY 2 covalent

C X2Y ionic

D X2Y covalent


3p 3p

4p 4p

7

3 Li


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4541 Kimia SULIT

Nama :............................................................................................. Tingkatan : ...................................

10 34 g of ammonia consists of

[Relative molecular mass of ammonia = 17, Avogadro constant = 6.02 x 1023

mol-1

]

I. 2 mole of nitrogen atoms

II. 2 mole of ammonia molecules

III. 1.204 X 10 24 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

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


XY W

Z


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14 An element T reacts with bromine to produce respectively TBr 3. The electron arrangement of T is

A 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. Cl 2II. CO 2III. C 2H4IV. N 2

A II and III only

B 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. limewater IV. zinc sulphate powder

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

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

A Electrical chemicalB Electrical lightC Chemical ElectricalD Chemical heat



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4541 Kimia SULIT

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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 theactual 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.

F : 2.8.3 [1 mark]

(ii) Give the formula of ion F.

F +3

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

A,D,C,B,G,F,E [1 mark]

(c) Element A exists as a monoatomic gas. Explain why.

Atom A has a stable / duplet electron arrangement / 2 valance electrons [1 mark]

(d) Element D is more reactive than element G. Explain why.

1. Size of atom D is smaller than G2. Strength of the nucleus of atom D to attract electron increase

[2 marks]

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

Ionic

[1 mark]



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4541 Kimia SULIT

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

# - Number of shells and electrons - 1m- Charge - 1m

[2 marks]

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

- has high melting point and boiling point /- conduct electricity in molten state or aqueous solution /- soluble in water /- insoluble in organic solvent

# any one [1 mark]

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?

calcium oxide

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

ethanol[1 marks]

(iii) a giant covalent molecules?

graphite


-

D

-

DE

2+


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4541 Kimia SULIT

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

Ethanol [1 mark]

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

- Covalent compound consisting of neutral molecules /- not contain freely moving ion (electrons)

[1 mark](c) Why does ethanol have low melting point and boiling points?.

- made up of molecules which are held together by weak forces (van der Waals) /- forces can be overcome easily with only a little energy.

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

- Ions- atom calcium donates 2 electrons to form a calcium ion / Ca Ca 2+ + 2e- oxygen atom receives 2 electrons to form an oxide ion / O 2 + 4e 2O 2-

[2 marks ]

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

- carbon atoms are held together by strong covalent bonds to form a giants molecules.- a high maount of energy needs to overcome these strong bonds.

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

- copper atoms- solid

[2 marks] _______________________________________________________________________________________

[X / 40 ] x 100 = ........................%

X = total marks obtained

_______________________________________________________________________________________



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Section C (cancelled)

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]

END OF QUESTION PAPER


Skema Pemarkahan Ujian Setara 2 - Ogos 2008

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