Chemistry pk 1 (2011)

SEKOLAH MENENGAH KEBANGSAAN BATU KIKIR (MODEL KHAS)

72200 BATU KIKIR

NEGERI SEMBILAN

UJIAN PENILAIAN 1 (2011)

CHEMISTRY / KIMIA

Time / Masa (1 ½ hours / jam)

Name / Nama :………………………………………………..

Form / Tingkatan :……………………………………………......

SECTION A

1. Which of the following electron arrangements has three valence electron?

Antara susunan berikut,yang manakah mempunyai tiga elektron valens?

A. C.

B. D.

2. Gas particles diffuse faster than liquid because ...

Zarah-zarah gas meresap pada kadar yang cepat berbanding cecair kerana ...

A. The particles have kinetic energy.

Zarah-zarah mengandungi tenaga kinetik.

B. The arrangement of particles in a liquid is in a fixed point.

Susunan zarah-zarah cecair adalah dalam kedudukan tetap.

C. The space between gas particles is greater than the space between liquid particles.

Ruang diantara zarah-zarah gas adalah lebih banyak berbanding cecair.

D. The space between gas particles is smaller than the space of liquid particles.

×

×

×

×

××

××

××

×

×

×××

×

××

Ruang diantara zarah-zarah gas adalah lebih kecil berbanding cecair.

3.

Figure 1

Figure 1

Gambar rajah 1

Figure 1 shows an experiment conducted with liquid bromine. What can be concluded

from the experiment?

Gambar rajah 1 menunjukkan satu eksperimen menggunakan cecair bromine. Apakah

yang dapat disimpulkan berdasarkan eksperimen ini?

I. Bromine gas diffuses into the air in the gas jar.

Gas bromine meresap kedalamudara dalam baling gas.

II. Liquid bromine combines with air to release a reddish brown gas.

Cecair bromine bergabung dengan udara untuk membebaskan gas berwarna

perang

III. Bromine gas is made up of tiny and discrete particles. It occupies the empty

spaces between air molecules.

Gas bromine terdiri daripada zarah-zarah yang kecil dan diskrit. Ia boleh

memenuhi ruang diantara molekul udara.

A. I only C. I and III only

I sahaja I dan III sahaja

B. II only D. I, II and III

II sahaja I, II and III

4. “The higher the temperature, the faster the reaction.” This statement is called ...

“Semakin meningkat suhu, semakin laju tindakbalas.” Penyataan ini dipanggil ...

A. Inference C. Problem statement

Inferens Penyataan masalah

B. Hypothesis D. Variable

Hipotesis Pembolehubah

After a few seconds

Setelah beberapa saat A drop of liquid bromine

Setitis cecair bromin

Filled with reddish brown gas

Berisi gas berwarna perang

5. Figure 2 shows a model of an atom

Gambar rajah 2 dibawah menunjukkan satu model atom

Figure 2

Gambar rajah 2

Who introduced this model?

Siapakah yang memperkenalkan model ini?

A. Neils Bohr C. James Chadwick

Neils Bohr James Chadwick

B. John Dalton D. Ernest Rutherford

John Dalton Ernest Rutherford

6. Below are the characteristics of two different matter states.

Di bawah adalah ciri-ciri dua jenis keadaan jirim.

State of Matter 1Keadaan Jirim 1

State of Matter 2Keadaan Jirim 2

Particles are arranged orderly, closely and densely.Zarah-zarah tersusun secara rapat , teratur dan tetap.

Particles are not able to move freely.Zarah tidak bebas bergerak.

Particles are far apart from each other.Zarah-zarah terpisah daripada satu sama lain.

Particles are moving freely.Zarah-zarah bergerak secara rawak.

Table 1

Jadual 1

The changes of matter from state 1 to 2 is known as ...

Perubahan jirim dari keadaan 1 ke 2 dikenali sebagai ...

A. Melting C. Sublimation

Peleburan Pemejalwapan

B. Evaporation D. Condensation

●

●●

●

Penyejatan Kondensasi

7. Which of the following would describe isotopes?

Diantara penyataan dibawah yang manakah menerangkan isotop?

I. They have the same proton number but a different number of electrons.

Ia mempunyai bilangan proton yang sama tetapi bilangan electron yang

berbeza.

II. They exhibit the same chemical properties.

Ia mempunyai sifat kimia yang sama.

III. Elements exhibiting isotope have only two isotopes.

Unsur yang menmpunyai isotop hanya mempunyai dua isotop.

IV. They have the same number of protons but a different number of neutrons.

Ia mempunyai bilangan proton yang sama tetapi bilangan neutron yang

berbeza.

A. I and II only C. II and IV only

I dan II sahaja II dan IV sahaja

B. I and III only D. II, III and IV only

I dan III sahaja II, III dan IV sahaja

8. Figure 2 shows the symbol for a chlorine atom

Rajah 2 menunjukkan symbol atom klorin

Figure 3

Rajah 3

Which of the following is true based on Figure 2

Antara berikut, yang manakah benar berdasarkan symbol dalam Rajah 2

Proton number

Nombor proton

Nucleon number

Nombor nukleon

Number of electrons

Bilangan elektron

A.

B.

C.

D.

17

17

20

37

37

20

37

17

17

17

20

37

37 Cl17

9. Acetamide solids are heated until they melt. Which of the following graph represents

the temperature versus time graph?

Pepejal acetamida dipanaskan sehingga melebur. Antara graf yang berikut, yang

manakah, mewakili graf suhu melawan masa?

A.

B.

C.

D.

10. What is the number of moles of copper (II) sulphate in 80 g of copper (II) sulphate,

CuSO4?

Berapa bilangan mol kuprum (II) sulfat dalam 80 g, CuSO4?

[Relative atomic mass / Jisim relatif atom: O = 16, S = 32, Cu = 64]

A. 0.50 moles / mol C. 0.65 moles / mol

B. 0.52 moles / mol D. 0.70 moles / mol

Temperature/Suhu (OC)

Time/Masa(s) Temperature/Suhu (OC)



Time/Masa(s)

11. Which of the following statement is false?

Antara penyataan yang berikut yang manakah tidak benar?

A. The number of electrons in an atom is equal to the number of protons.

Bilangan electron dalam suatu atom adalah sama dengan bilangan protonnya.

B. When an atom loses one electron, it becomes an ion.

Apabila satu atom kehilangan satu electron ia menjadi ion

C. The nucleon number is the total number of protons and electrons of an atom.

Nombor nucleon adalah jumlah bilangan proton dan elektron dalam suatu

atom.

D. The proton number is the total number of proton of element.

Nombor proton adalah bilangan proton dalam ssatu elemen

12. What is the relative atomic mass of an element?

Apakah jisim relatif atom bagi sesuatu unsur?

A.

B.

C.

D.

13. A waste disposal area can produce 36 dm3 of methane gas due to the activity of

microorganisms. What is the mass of methane gas produced?

[Relative atomic mass: H = 1, C = 12; 1 mole of gas occupies the volume of 24 dm 3 at

room temperature and pressure]

Satu kawasan pelupusan sampah boleh menghasilkan 36 dm3 gas metana hasil aktiviti

mikroorganisma. Berapakah jisim gas metana yang dihasilkan?

[Jisim relatif atom: H = 1, C = 12; 1 mol gas menempati 24 dm3 pada keadaan bilik]

A. 16 g C. 24 g

B. 20 g D. 27 g

14. What can be deduced from the symbol ?

Apakah yang boleh diperolehi daripada simbol ?

I. The atom of element X has 7 valence electrons.

Atom unsure X mempunyai 7 elektron valens.

II. The atom of element X has 9 protons and 19 neutrons.

Atom unsur X mempunyai 9 proton dan 19 neutron.

III. The atom of element X has 2 shells filled with electrons.

Atom unsur X mempunyai 2 petala yang berisi electron.

IV. The atom of element X has proton number 9 and nucleon number 19.

Atom unsur X mempunyai nombor proton 9 dan nombor nukleon 19.

A. I, II and III.

I, II dan III.

B. I, II and IV.

I, II dan IV.

C. I, III and IV.

I, III dan IV.

D. I, II, III and IV

I, II. III dan IV.

15. Which of the following statements is true about isotopes?

Antara penyataan yang berikut yang manakah benar mengenai isotop?

A. They have the same chemical properties and physical properties.

Ia mempunyai sifat kimia dan sifat fizikal yang sama.

B. They have the different chemical properties and physical properties.

Ia mempunyai sifat kimia dan sifat fizikal yang berbeza.

C. They have the different chemical properties but same physical properties.

Ia mempunyai sifat kimia yang berbeza tetapi sifat fizikal yang sama.

D. They have the same chemical properties but different physical properties.

Ia mempunyai sifat kimia yang sama tetapi sifat fizikal yang berbeza.

16. Figure 4 shows the molecular structure of a molecule of paracetamol, a medicine used

to relieve pain and fever.

Rajah 4 menujukkan struktur molekul paracetamol, sejenis ubat yang digunakan

untuk mengurangkan kesakitan dan demam panas.

H

H O H

C C

C C N C C H

C C H

H O C H

H

Figure 4

Rajah 4

A pill contains 1.2 × 1021 paracetamol molecules. Calculate the mass of paracetamol

in the pill .

[Relative atomic mass: H = 1, C = 12]

Satu pil mengandungi 1.2 × 1021 molekul paracetamol. Kirakan jisim pil paracetamol

itu.

[Jisim relatif atom: H = 1, C = 12]

17. A compound with formula X2CO3 has a relative formula mass of 106. What is the

relative atomic mass of X?

[Relative atomic mass: O = 16, C = 12]

Satu sebatian berformula X2CO3 mempunyai jisim formula relative 106. Apakah jisim

atom relatif bagi X?

[Jisim relatif atom: O = 16, C = 12]

A. 23 C. 40

B. 39 D. 69

18. Table 2 shows the relative atomic mass of element R and T.

Jadual 2 menunjukkan jisim relative atom bagi unsur R dan T.

Table 2

Jadual 2

Which of the following is true about the atoms of element R and T?

Antara penyataan yang berikut yang manakah benar mengenai unsur R dan T?

A. The mass of 1 atom of T is 16.

Jisim 1 atom T adalah 16.

B. The number of protons in atom R is 64.

Nombor proton bagi atom R adalah 64.

C. 4 moles of T have the same mass as 1 mole of R.

4 mol T mempunyai jisim yang sama dengan 1 mol R.

D. The density of 1 atom of R is four times more than that of an atom of T.

Ketumpatan 1 atom R adalah empat kali lebih daripada atom T.

Element

Unsur

Relative atomic mass

Jisim relatif atom

R 64

T 16

19. X gram of aluminium has three times more atoms than 1.38g of sodium. What is the

value of X?

[Relative atomic mass: Na = 23, Al = 23]

X gram aluminium mempunyai tiga kali ganda lebih atom berbandin 1.38g natrium.

Apakah nilai X?

[Jisim relatif atom: Na = 23, Al = 23]

A. 0.54 g C. 3.53 g

B. 1.62 g D. 4.86 g

20. Which of the following contains 1.505 × 1023 atoms?

[Relative atomic mass: Mg = 24 Ca = 40; Avogadro’s Constant = 6.02 × 1023]

Antara berikut yang mankah mengandungi 1.505 × 1023 atom?

[Jisim relatif atom: Mg = 24, Ca = 24]

A. 5 g Calcium C. 12 g Magnesium

5 g Kalsium 12 g Magnesium

B. 10 g Calcium D. 24 g Magnesium

10 g Kalsium 24 g Magnesium

SECTION B

1. Table 1 shows the proton number and nucleon number of six particles P, Q, R, S, T

and U.

Jadual 1 menunjukkan nombor proton dan nombor nucleon bagi enam zarah P, Q, R, S.T dan

U.

Element

Unsur

Proton number

Nombor proton

Nucleon number

Nombor nukleon

Electron arrangement

Susunan elektron

P 6 12

Q 11 23

R 8 16

S 6 14

T 15 31

U 19 39

Table 1

Jadual 1

a) Write the electron arrangement of each particle.

Nyatakan susunan electron bagi setiap zarah.

[2 marks / markah]

b) What is the number of valence electrons in particle R?

Apakah bilangan electron valens dalam zarah R?

[1 mark / markah]

c) Draw the atomic structure of T

Lukis struktur atom T.

[2 marks / markah]

d) Explain the meaning of nucleon number.

Terangkan maksud nombor nucleon.

[1 mark / markah]

e) What is the number of neutrons in U?

Apakah nombor neutron dalam U?

[1 mark / markah]

f) i) Explain the meaning of the term “isotope”.

Terangkan maksud istilah “isotop”.

[1 mark / markah]

ii) Which of the elements in Table 1 is a pair of isotopes?

Antara unsur-unsur dalam Jadual 1yang manakah mewakili sepasang isotop?

[1 mark / markah]

2. Compare the three states of matter in terms of particle arrangements, forces of

attraction between the particles, kinetic energy of particles and types of motion of

particle.

Bandingkan tiga keadaan jirim dari aspek susunan zarah, daya tarikan diantara

zarah, kandungan tenaga kinetik zarah dan pergerakan zarah.

[13 marks / markah]

SECTION C

An experiment is carried out to determine the freezing point of naphthalene. Solid

naphthalene is heated in a water bath until it melts completely.

The initial temperature is recorded.

The molten naphthalene is left to cool.

The reading of the temperature is recorded every 30 seconds.

Figure 1 shows the recorded temperature reading every 30 seconds.

Satu eksperimen dijalankan untuk menentukan takat beku naftalena. Pepejal naftalena

dipanaskan didalam kukus air sehingga melebur dengan lengkap.

Suhu awal direkodkan.

Leburan naftalena dibiarkan menyejuk.

Bacaan suhu direkodkan setiap 30 saat.

Rajah 1 menunjukkan bacaan termometer yang direkodkan pada sela 30 saat.

Initial temperature :

Temperature at 30 s :

Suhu awal : Suhu pada 30 s :

Temperature at 60 s : Temperature at 90 s :

Suhu pada 90 s : Suhu pada 90 s :


Suhu pada 120 s : Suhu pada

150 s :


Suhu pada 180 s : Suhu pada 210 s :

Figure 1

Rajah 1

a) Record the temperatures in the spaces provided in Figure 1.

Catatkan suhu pada ruang yang disediakan dalam Rajah 1.

[3 marks / markah]

b) On the graph paper, draw the graph of temperature against time for the cooling of

naphthalene.

Pada kertas graf, lukiskan graf suhu melawan masa bagi penyejukkan naftalena.

[3 marks / markah]

c) i) Use the graph in (b), to determine the freezing point of naphthalene.

Show on the graph paper how you determine the freezing point of naphthalene.

Gunakan graf di (b), untuk menentukan takat beku naftalena.

Tunjukkan pada graf bagaimana anda menentukan takat beku ini.

[3 marks / markah]

ii) How does the graph in (b) show the freezing point of naphthalene.

Bagaimankah graf di (b) dapat menunjukkan takat beku naftalena.

[3 marks / markah]

d) The temperature of the naphthalene did not change from the 90 th second until the 50th

second during the cooling process.

Explain why.

Suhu naftalena tidak berubah dari saat ke 90 sehingga saat ke 150 semasa proses

penyejukan itu.

Terangkan mengapa.

[3 marks / markah]

e) On the graph paper sketch a curve you would expect if the molten naphthalene is

cooled quickly.

Pada kertas graf lakarkan lengkung yang anda jangkakan itu jika naftalena lebur itu

disejukkan dengan cepat.

[3 marks / markah]

Prepared by / Disediakan oleh: Checked by / Disemak oleh:

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

(Cik Theesha a/p Thituvengidam) (Pn. Rusmanisah Bt. Mohd. Nadzri)

Verified by / Disahkan oleh:

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

(Pn. Anita Bt. Shaari)

Answer Scheme

SECTION A

1. C 11. C

2. C 12. B

3. C 13. C

4. B 14. C

5. A 15. D

6. C 16.

7. C 17. A

8. A 18. C

9. B 19. D

10. A 20. B

SECTION B

1. (a) P: 2.4

Q: 2.8.1

R: 2.6

S: 2.4

T: 2.8.5

(b) 6

(c)

(d) Nucleon number is the total number of protons and neutrons in the nucleus of

the atom.

(e) 39 – 19 = 20 neutrons

×

×

××

× ×

× ×

× ×

× ×

××

×

(f) (i) Isotopes are atoms of the same element having the same proton

number but different nucleon number / neutron number.

(ii) P and S

(g) Q and U because each has one valence electron

State of matter Solid Liquid Gas

Particles arrangement

The particles are packed closely together in an orderly manner

The particles are less closely packed but not in an orderly arrangement

The particles are further apart from each other.

Particles movement

Particles can only vibrate and rotate about their fix positions.

Particles are attracted by very strong forces.

Particles are attracted by moderately strong forces.

Attractive forces between

the particles

Particles are attracted by a very strong forces between the particles

Particles are held together by strong forces but weaker than the forces in solid /(moderately)

The attraction forces between particles are weak forces

Energy content of particles

Very low energy Moderately high energy. Very high energy

2.

SECTION C

a)

b) -Title

-Axis labelled with unit and proper scale

-Properly plotted graph

c) i) 80°C

ii) There is no temperature change during the cooling process.

d) The heat released during the formation of bonds balances the heat lost to the surrounding

e)

Time (s) 0 30 60 90 120 150 180 210

Temperature (° C) 95 85 82 80 80 80 75 70

Education

Chemistry pk 1 (2011)