ujian chemical bonds-f4

7/31/2019 Ujian Chemical Bonds-f4

1/8

1.

Table 2 shows the electron arrangement of atoms P , Q , R and T

Jadual 2 menunjukkan susunan elektron atom-atom P, Q, R dan T

Which of the following pairs of elements can combine to form a covalent compound?

Pasangan unsur yang manakah dapat berpadu membentuk sebatian kovalen ?

Atom

Atom

P Q R T

Electron arrangement

Susunan elektron

2.1 2.4 2.8.2 2.8.7

Q and T

P and R

R and TQ and R

Which pair is correctly matched?

Property

Sifat

Potassium bromide

Kalium bromida

Tetrachloromethane

Tetraklorometana

A Melting and boiling point High High

BElectrical conductivity Conducts electricity in a

molten state

Does not conduct

electricity

C Solubility in water Insoluble Soluble

DPhysical state at room

temperature

LiquidGas

Table 2

Jadual 2


2/8

11 Which statement is true about the reaction of a sodium atom with oxygen atom to form

sodium oxide ?[Proton number: Na = 11, O = 8]

Pernyataan yang manakah benar bagi tindak balas antara atom natrium dengan atom

oksigen untuk membentuk natrium oksida ?

[Nombor proton : Na = 11, O = 8]

A One sodium atom donates one electron to one oxygen atom

Satu atom natrium menderma satu elektron kepada satu atom oksigen

B One sodium atom shares one electron with one oxygen atom

Satu atom natrium berkongsi satu elektron dengan satu atom oksigen

C Two sodium atom share one electron with one oxygen atom

Dua atom natrium berkongsi satu elektron dengan satu atom oksigen

D Two sodium atoms donate one electron each to one oxygen atom

Dua atom natrium menderma satu elektron setiap satu kepada satu atom oksigen

9 Table 2 shows the electron arrangement of atom R, S, T and U.Jadual 2 menunjukkan susunan elektron bagi atom R, S , T dan U..

AtomAtom

Arrangement of electronSusunan elekkton

R 2.4

S 2.6

T 2.8.1

U 2.8.7

Table 2Jadual 2

Whichof the following atoms can form ionic bond?Antara pasangan atom-atom berikut, yang manakah boleh membentuk ikatan ionik?

A T and U

B R and U

C S and U

D R and S15 Diagram 5 shows the electron arrangement of a compound formed between atoms X and Y.

Rajah 5 menunjukkan susunan elektron bagi sebatian yang terbentuk antara atom X dengan atomY.


3/8

2.8 2.8.8Diagram 5Rajah 5

Which of the following statements is true about the compound?

Antara pernyataan berikut yang manakah benar tentang sebatian tersebut?

A The compound has a low boiling pointSebatian itu mempunyai takat didih yang rendah

B The compound dissolved in organic solventSebatian itu larut dalam pelarut organik

C The compound is formed by sharing the electronSebatian itu terbentuk melalui perkongsian elektron

D The compound can conduct electricity in a molten stateSebatian itu boleh mengkonduksi elektrik dalam keadaan leburan

24 Diagram 10 shows the electron arrangements of two atoms V and WRajah 10 menunjukkan susunan elektron bagi dua atom V andW

V

WDiagram 10

Rajah 10Which of the following is true when V react with W?Antara berikut yang manakah benar apabila V bertindak balas dengan W?

A

B

C

V receives electrons

V menerima elektron

W donates electronsW menderma elektron

The compound formed has a formula of V4WSebatian yang terbentuk mempunyai formula V4W


4/8

D The compound formed is made up of moleculesSebatian yang terbentuk terdiri daripada molekul

48 Table 6 shows the proton number of atoms of elements S and T.Jadual 6 menunjukkan nombor proton bagi atom unsur S dan T.

ElementUnsur

Proton numberNombor proton

S 12

T 17

Table 6Jadual 6

Which of the following is the correct chemical formula and chemical bonding for the compound

formed between S and T?

Antara formula dan jenis ikatan kimia berikut yang manakah benar bagi sebatian yang

terbentuk antara S dan T?

FormulaFormula

Type of bondJenis ikatan

A ST2 IonicIonik

B S2T IonicIonik

C ST2 CovalentKovalen

D S2T CovalentKovalen

2 Diagram 2 shows the electron arrangement of a compound formed between elements X and

Y.

Rajah 2 menunjukkan susunan elektron bagi satu sebatian terbentuk antara unsur X dan

unsurY.

2+

Y YX


5/8

Diagram 2

Rajah 2

(a)State the type of compound.Nyatakan jenis sebatian itu.

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

[1 mark]

[1 markah]

(b)Write the formula of the compound.Tulis formula bagi sebatian itu.

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

[1 mark]

[1 markah]

(c)Write the electron arrangement forTulis susunan elektron bagi

(i) atom X: ......................................................................................................................atom X

(ii) atomY : .....................................................................................................................atom Y

[2 marks]

[2 markah]


6/8

(d) Two atoms Y share electrons to form a substance.Dua atom Y berkongsi elektron untuk membentuk satu bahan.

(i) Draw the electron arrangement of the substance.Lukiskan susunan elektron bagi bahan itu.

[2 marks]

[2 markah]

(ii)Name the type of bond formed in (d) (i).Namakan jenis ikatan terbentuk dalam (d) (i).

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

.[1 mark]

[1 markah]

(e) Compare the melting point of compound in (a) and substance in (d).Explain your answer.

Bandingkan takat lebur bagi sebatian dalam (a) dan bahan dalam (d).Terangkan jawapan anda.

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

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

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

[3 marks]

[3markah]


7/8

Table 9 below shows the location for the atoms of elements P, Q and R in theperiodic table. These letters are not the actual symbols of the elements.

ElementUnsur

GroupKumpulan

PeriodKala

P 14 2Q 1 3

R 17 3Table 9

Jadual 9

(a) Based on the information in the Table 9, explain how two compoundscan be formed from these atoms of elements. The two compoundsshould have different types of bond.

[12 marks]

(b) Compare two physical properties below for the two different type ofcompounds formed in (a).

Melting point

Electrical conductivity

Explain the differences in each of the physical properties.

[8 marks]

3

Ionic compound can conduct electricity in the molten and aqueous states but covalent

compound cannot conduct electricity in all state.


8/8

Sebatian ion boleh mengkonduksi elektrik dalam leburan dan akueus tetapi sebatian

kovalen tidak boleh mengkonduksi elektrik dalam semua keadaan.

Based on the statement above, plan a laboratory experiment to investigate the electricalconductivity of lead(II) bromide and naphthalene.

Berdasarkan pernyataan di atas, rancangkan satu eksperimen untuk menyiasat

kekonduksian elektrik bagi plumbum(II) bromida dan naftalena.

Your planning should include the following aspects:

Perancangan anda hendaklah mengandungi aspek-aspek berikut:

(a) Statement of the problemPernyataan masalah

(b) All the variablesSemua pembolehubah

(c) Statement of the hypothesisPernyataan hipotesis

(d) List of substances and apparatusSenarai bahan dan radas

(e) Procedure of the experiment

Prosedur eksperimen

(f) Tabulation of dataPenjadualan data

[17 marks]

[17 markah]

ujian chemical bonds-f4

Documents