PEPERIKSAAN IJAZAH SARJANA MUDA SAINS
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE
SESI AKADEMIK 2016/2017 : SEMESTER II ACADEMIC SESSION 2016/2017 : SEMESTER II
SIC1001 : PRINSIP KIMIA
PRINCIPLE OF CHEMISTRY
Jun 2017 MASA: 2 jam
June 2017 TIME: 2 hours
ARAHAN KEPADA CALON:
INSTRUCTIONS TO CANDIDATES:
Kertas soalan ini mengandungi Bahagian A dan B.
This paper consists of Section A and B.
Jawab soalan mengikut arahan yang diberikan di dalam setiap bahagian.
Question should be answered according to the instructions given in each section.
(Kertas soalan ini mengandungi 7 soalan dalam 7 halaman yang bercetak) (This question paper consists of 7 questions on 7 printed pages)
2/7 BAHAGIAN A (50 MARKAH)
SECTION A (50 MARKS)
Jawab SEMUA soalan.
Answer ALL questions.
1. (a) Pada tahun 1905, Robert A. Millikan memperkenalkan eksperimen untuk mengukur caj pada elektron tunggal yang dikenali sebagai eksperimen Titisan Minyak Millikan. Terangkan secara ringkas tentang eksperimen tersebut dan hasil yang ketara daripadanya.
In 1905, Robert A. Millikan came up with an experiment to measure the charge on a single electron called the Millikan Oil-Drop experiment. Briefly explain about the experiment and the significant output from it.
(5 markah/ marks)
(b) Kira fungsi kerja bagi elektron yang terpancar apabila permukaan logam sesium didedahkan kepada radiasi pada 532 nm. Tenaga kinetik maksimum elektron yang dipancarkan telah ditentukan sebagai 3.14 x 10-19 J. [Pemalar Planck, h = 6.626 x 10-34 Js, kelajuan cahaya, c = 2.9979 x 108 ms-1]
Calculate the work function of the emitted electron when the surface of metallic cesium was exposed to a radiation at 532 nm. The maximum kinetic energy of the emitted electrons was determined as 3.14 x 10-19 J.
[Planck constant, h = 6.626 x 10-34 Js, velocity of light, c = 2.9979 x 108 ms-1] (5 markah/ marks)
2. (a) Nyatakan Aturan Hund.
State the Hund’s Rule.
(2 markah/ marks)
(b) Tulis set lengkap nombor kuantum bagi atom/ion berikut:
Write a full set of quantum numbers for the following atom/ion:
(i) Elektron valens bagi atom natrium.
The valence electron in a sodium atom.
(ii) Pertambahan elektron apabila atom klorin, Cl menjadi ion klorida, Cl-.
The electron gain when a chlorine atom, Cl becomes a chloride ion, Cl-.
(4 markah/ marks)
3/7 (c) Beri konfigurasi electron valens bagi atom-atom berikut:
Give the valence electronic configurations of the following atoms:
16S, 26Fe, 37Rb, 42Mo
(4 markah/ marks)
(d) Tulis konfigurasi elektron lengkap dan lakarkan gambarajah aras tenaga, menunjukkan kedudukan elektron di dalam gambarajah orbital bagi ion kuprum, Cu2+. [Nombor atom: Cu = 29]
Write the complete electronic configuration and sketch the energy level diagram, showing the occupancy of electron in the orbital diagram for copper ion, Cu2+. [Atomic number: Cu = 29]
(5 markah/ marks)
3. (a)(i) Nyatakan Hukum Boyle dan tuliskan persamaannya.
State the Boyle’s Law and write the equation.
(4 markah/ marks)
(ii) Lakarkan graf tekanan, P terhadap isipadu, V dan P terhadap 1/V.
Sketch graphs of pressure, P against volume, V and P against 1/V.
(4 markah/ marks) (b) Aseton digunakan secara meluas sebagai penghilang pengilat kuku.
Satu sampel cecair aseton diletakkan di dalam kelalang 3.25 L dan mengewap melalui pemanasan sehingga 95.0°C pada 1.05 atm. Wap yang mengisi kelalang pada suhu dan tekanan ini seberat 6.55 g.
Tentukan jisim molar aseton.
[Pemalar gas, R = 0.0821 atm L mol-1 K-1]
Acetone is widely used as a nail polish remover. A sample of liquid acetone is placed in a 3.25 L flask and vaporized by heating to 95.0°C at 1.05 atm. The vapor filling the flask at this temperature and pressure weighs 6.55 g.
Determine the molar mass of acetone.
[Gas constant, R = 0.0821 atm L mol-1 K-1]
(5 markah/ marks) 4. (a) Kira min halaju punca kuasa dua bagi gas sulfur dioksida, SO2 pada suhu 55.0C. [Pemalar gas, R = 8.314 JK-1mol-1,Jisim atom relatif: S = 32.066; O = 15.999]
Calculate the root-mean-square speed of sulphur dioxide, SO2 at 55.0°C.
[Gas constant, R = 8.314 JK-1mol-1, Relative atomic mass: S = 32.066;
O = 15.999]
(6 markah/ marks)
4/7 (b) Diberi 1.85 mol gas ammonia, NH3 menduduki sebuah bekas 3.50 L
pada suhu 45.0°C. Hitung tekanan gas tersebut (dalam atm) menggunakan persamaan Van der Waals.
[Pemalar gas, R = 0.0821 atm L mol-1 K-1, pemalar Van der Waals untuk ammonia: a: 4.17 atm L2mol-2 dan b: 0.0371 L mol-1]
Given that 1.85 moles of ammonia, NH3 occupy 3.50 L at 45.0°C. Calculate the pressure of the gas (in atm) using the Van der Waals equation.
[Gas constant, R = 0.0821 atm L mol-1 K-1, Van der Waals constants for ammonia: a: 4.17 atm L2mol-2 and b: 0.0371 L mol-1]
(6 markah/ marks)
BAHAGIAN B (50 MARKAH) SECTION B (50 MARKS)
Jawab SEMUA soalan.
Answer ALL questions.
5. (a) Pilih mana-mana atom atau ion dari sebatian berikut dan jelas susunan elektron berikut:
Choose any atom or ion from the following compounds and explain the following types of electron arrangements:
PbCl2 NaCl SnCl4
(i) susunan gas nadir;
inert gas arrangement;
(ii) susunan preudo-gas nadir; dan pseudo-inert gas arrangement; and
(iii) kesan pasangan lengai.
inert pair effect.
(5 markah/ marks)
(b) (i) Lukis struktur Lewis yang lengkap untuk setiap spesies berikut dan tunjukkan struktur resonansnya (jika ada):
Draw a complete Lewis structure for each of the following species and show its resonance structure (if any):
CO32- dan/and XeF4
5/7 (ii) Ramalkan bentuk atau geometri dan jenis penghibridan pada
atom pusat untuk spesies di (b)(i) di atas.
Predict the geometry or shape and the type of hybridization for the central atom of each of the above species in (b)(i).
[Nombor Atom/Atomic Number: C = 6; O = 8; F = 9; Na = 11;
Cl = 17; Br = 35; Sn = 50; Xe = 54; Pb = 82]
(9 markah/ marks)
(c) Ion N2+ boleh disediakan secara meledakkan molekul N2 dengan elektron berkelajuan tinggi. Dengan menggunakan teori orbital molekul, ramalkan ciri-ciri berikut untuk ion N2+:
The N2+ ion can be prepared by bombarding the N2 molecule with fast-moving electrons. By using molecular orbital theory, predict the following properties of N2+ ion:
(i) susunan elektron;
electron configuration;
(ii) tertib ikatan;
bond order;
(iii) ciri magnet; dan
magnetic properties; and
(iv) panjang ikatan berbanding dengan panjang ikatan N2 (110 pm).
bond length relative to the bond length of N2 (110 pm).
(6 markah/ marks)
6. (a) Takrifkan formula empirik.
Define empirical formula.
Suatu bahan organik yang diketahui hanya mengandungi karbon, hidrogen dan oksigen. 6.49 mg dari sebatian ini dibakar selengkapnya di dalam oksigen dan menghasilkan 9.74 mg CO2 dan 2.64 mg air tanpa hasilan yang lain. Apakah (i) jisim oksigen di dalam sampel ini, dan (ii) formula empirik untuk sebatian organik ini?
An organic compound is known to contain only carbon, hydrogen and oxygen.
6.49 mg of this compound was burned completely in oxygen to give 9.74 mg CO2 and 2.64 mg of water, and no other products. What is (i) mass of oxygen present in the sample, and (ii) the empirical formula of this compound?
[Jisim atom relatif/Relative atomic mass: H = 1.008; C = 12.01; O = 16.00]
(7 markah/ marks)
6/7 (b) Logam vanadium digunakan untuk membuat aloi keluli, boleh dihasilkan
secara industri dari tindakbalas vanadium (V) oksida dengan kalsium pada suhu yang tinggi:
Industrially, vanadium metal, which is used in steel alloys, can be obtained by reacting vanadium (V) oxide with calcium at high temperature:
5Ca + V2O5 5CaO + 2V
Di dalam satu proses, 1.54 kg V2O5 bertindakbalas dengan 1.96 kg Ca.
In one process, 1.54 kg of V2O5 react with 1.96 kg of Ca.
(i) Hitung hasil teori vanadium.
Calculate the theoretical yield of vanadium.
(ii) Hitung peratus hasil vanadium jika jisim sebenar yang diperolehi ialah 803 g.
Calculate the percentage yield of vanadium if the actual yield obtained was 803 g.
[Jisim atom relatif/Relative atomic mass: O = 16.0; Ca = 40.0;
V = 51.0]
(6 markah/ marks)
(c) Imbangkan persamaan berikut:
Balance the following equation:
Fe2+ + MnO4- + H+ Fe3+ + Mn2+ + H2O
9.80 g ammonium ferum (II) sulfat tulen, FeSO4.(NH4)2SO4.6H2O, telah dilarutkan kepada 250 cm3 dengan asid sulfurik cair. 25.0 cm3 larutan tersebut telah bertindakbalas sepenuhnya dengan 24.6 cm3 larutan kalium manganat (VII).
9.80 g of pure ammonium iron (II) sulphate, FeSO4.(NH4)2SO4.6H2O, was made up to 250 cm3 with dilute sulphuric acid. 25.0 cm3 of the solution reacted completely with 24.6 cm3 of potassium manganate (VII) solution.
(i) Hitung kemolaran larutan ammonium ferum (II) sulfat.
Calculate the molarity of the ammonium iron (II) sulphate solution.
(ii) Hitung kepekatan larutan kalium manganat (VII).
Calculate the concentration of potassium manganate (VII) solution.
[Jisim atom relatif/Relative atomic mass: H = 1.0; N = 14.0; O = 16.0;
S = 32.0; Mn = 55.0; Fe = 56.0]
(7 markah/ marks)
7/7 7. (a) Jelaskan perubahan kepada jejari atom (i) dari kiri ke kanan apabila
merentasi kala dan (ii) dari atas ke bawah apabila menuruni kumpulan Jadual Berkala.
Explain changes in atomic radius (i) from left to right across a period and (ii) from top to bottom in a group of a Periodic Table.
Susun atom-atom berikut mengikut susunan menurun jejari atom:
Arrange the following atoms in order of decreasing atomic radius:
Na, Al, P, Cl, Mg.
(6 markah/ marks)
(b) Takrif tenaga pengionan.
Define ionisation energy.
Jelaskan kenapa tenaga pengionan kedua sebarang unsur selalu lebih besar nilainya jika dibandingkan dengan tenaga pengionan pertama?
Explain why the second ionization energy of any element is always greater in value when compared with the first ionization energy?
(4 markah/ marks)
TAMAT END
