1. The document is a chemistry test paper containing multiple choice questions about chemical formulae and equations. 2. It tests students on topics like relative atomic mass, mole calculations, empirical formulae, gas volume calculations and stoichiometry. 3. The questions range in difficulty from calculating moles and masses to balancing chemical equations and solving multi-step stoichiometry problems.

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di sini TOPICAL TEST 3: CHEMICAL FORMULAE AND EQUATIONS
UJIAN TOPIKAL 3: FORMULA DAN PERSAMAAN KIMIA
PAPER 1 KERTAS 1
1 Which of the following is true about the 4 Sample Number of atoms in D 64
meaning of relative atomic mass? Sampel sample 8 The relative formula mass of a
Antara yang berikut, manakah benar tentang hydrated copper (II) sulphate is 250
maksud jisim atom relatif? Bilangan atom dalam sampel
with a formula of CuSO4.nH2O.
A The average mass of one atom of the
A 2 × 1023 atoms Calculate the value of n.
1 2 × 1023 atom [Relative atomic mass: H, 1; O, 16;
element when compared with 12 of S, 32; Cu, 64]
the mass of a carbon-12 atom. B 6 × 1023 atoms Jisim formula relatif bagi kuprum (II) sulfat
Purata jisim satu atom bagi unsur itu 6 × 1023 atom terhidrat ialah 250 dengan formula
1 CuSO4.nH2O. Kira nilai n.
C 4 × 1023 atoms [Jisim atom relatif: H, 1; O, 16; S, 32; Cu, 64]
apabila dibandingkan dengan 12 kali
4 × 1023 atom A 2 C 5
jisim satu atom karbon-12.
B The average mass of one molecule of B 4 D 8
the substance when compared with
1 Table 1 Jadual 1 9 What is the mass of 2.4 × 1021
12 of the mass of a carbon-12 Table 1 shows the number of atoms molecules of CO3?
contained in three samples of iron A, [Relative atomic mass: C, 12; O, 16;
atom.
Purata jisim satu molekul bagi bahan itu B and C. Which of the following Avogadro’s constant = 6.02 × 1023 mol–
1
1 shows the correct sequence of ]
Berapakah jisim bagi 2.4 × 1021 molekul
apabila dibandingkan dengan 12 kali samples in an descending order of CO3?
jisim satu atom karbon-12. number of moles of atoms? [Jisim atom relatif: C, 12; O, 16;
C The average mass of one atom of the Jadual 1 menunjukkan bilangan atom yang Pemalar Avogadro = 6.02 × 1023 mol–1]
element when compared with 12 of terdapat dalam tiga sampel, ferum A, B dan A 0.02 g C 0.11 g
C. Antara yang berikut, manakah
the mass of a carbon-12 atom. menunjukkan urutan menurun yang betul
B 0.01 g D 0.24 g
Purata jisim satu atom bagi unsur itu bagi bilangan mol atom dalam sampel-
apabila dibandingkan dengan 12 kali sampel tersebut?
jisim satu atom karbon-12.
10 3 g of element X react with 7.5 g of
A A, C, B element Y to form a compound with
D The average mass of one atom of B B, C, A
the element when compared with the empirical formula of X2Y3. What
C A, B, C is the relative atomic mass of Y?
the mass of a hydrogen-1 atom. D C, A, B
Purata jisim satu atom bagi unsur itu [Relative atomic mass: X, 60]
apabila dibandingkan dengan jisim satu 3 g unsur X bertindak balas dengan 7.5 g
atom hidrogen-1. 5 Calculate the number of molecules unsur Y untuk menghasilkan satu sebatian
yang mempunyai formula empirik X 2Y3.
in 0.2 mole of ethene, C2H4. Berapakah jisim atom relatif bagi Y?
2 How many times does one atom of [Avogadro’s constant = 6.02 × 1023 mol–1 ] [Jisim atom relatif: X, 60]
sulphur heavier than one atom of helium? Hitungkan bilangan molekul dalam 0.2 mol A 25 C 50
[Relative atomic mass: He, 4; S, 32] etena, C2H4.
[Pemalar Avogadro = 6.02 × 1023 mol–1]
B 40 D 100
Berapa kalikah satu atom sulfur lebih berat 23
daripada satu atom helium? A 0.2 × 10 molecules
[Jisim atom relatif: He, 4; S, 32] 0.2 × 1023 molekul 11 Calculate the volume of distilled
A C 4 B 1.2 × 1023 molecules water needed to mix with 11.7 g of
1.2 × 1023 molekul sodium chloride to get a solution of
B D 8 C 2.4 × 1023 molecules 1.7 mol dm–3 sodium chloride.
2.4 × 1023 molekul
[Relative atomic mass: Na, 23; Cl,
D 6.0 × 1023 molecules
3 Which of the following has the same 6.0 × 1023 molekul
35.5]
Hitungkan isi padu air suling yang
number of particles as in 2.8 g of iron? diperlukan untuk bercampur dengan 11.7 g
[Relative atomic mass: H, 1; C, 12; O, 6 What is the mass of 1 mole of hydrogen natrium klorida supaya menghasilkan larutan
16; Al, 27; Ca, 40; Fe, 56; Cu, 64; gas? 1.7 mol dm–3 natrium klorida.
Avogadro’s constant = 6.02 × 1023 mol– [Relative atomic mass: H, 1] [Jisim atom relatif: Na, 23; Cl, 35.5]
1 A 120 cm3
] Berapakah jisim bagi 1 mol gas hidrogen?
Antara yang berikut, manakah mempunyai [Jisim atom relatif: H, 1] B 300 cm3
bilangan zarah yang sama dengan dalam 2.8 g A 1 C 4 C 3000 cm3
ferum? B 2 D 6 D 6000 cm3
[Jisim atom relatif: H, 1; C, 12; O, 16; Al,
27; Ca, 40; Fe, 56; Cu, 64; pemalar
Avogadro = 6.02 × 1023 mol–1] 7 The relative molecular mass of a 12 A concentration of 0.75 mol dm–3 of
A 0.032 g of copper metal sulphate, XSO4 is 136. What is sulphuric acid is used as an
0.032 g kuprum the relative atomic mass of metal X? electrolyte in a car battery. What is
B 3 × 1021 of calcium particles [Relative atomic mass: O, 16; S, 32] the volume of electrolyte of 0.18
3 × 1021 zarah kalsium Jisim molekul relatif bagi satu logam sulfat, XSO4 ialah mole of sulphuric acid?
C 0.05 mole of oxygen 136. Berapakah jisim atom relatif bagi logam X? Asid sulfurik yang berkepekatan 0.75 mol dm –
0.05 mol oksigen A 23 3
digunakan sebagai elekrolit dalam bateri
D 9 g glucose, C6H12O6 B 32 kereta. Berapakah isi padu elektrolit bagi
9 g glukosa, C6H12O6 0.18 mol asid sulfurik?
C 40
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UJIAN TOPIKAL 3: FORMULA DAN PERSAMAAN KIMIA
PAPER 1 KERTAS 1
A 240 cm3 C 488 cm3 A X2O C X2O3 IV They have same relative atomic
B 333 cm3 D 560 cm3 B XO2 D X3O2 mass.
13 Calculate the mass of carbon Mempunyai jisim atom relatif yang sama.
contained in 375 g of zinc carbonate, 3
18 20 cm nitrogen gas and 60 cm of 3 A I only
I sahaja
ZnCO3. hydrogen gas react completely to
[Relative atomic mass: C, 12; O, 16; B I and II only
form ammonia gas at room I dan II sahaja
Zn, 65] temperature. Which of the following C I, II and III only
Hitung jisim karbon yang terkandung dalam calculation steps represents the I, II dan III sahaja
375 g zink karbonat, ZnCO3.
[Jisim atom relatif: C, 12; O, 16; Zn, 65] empirical formula for this ammonia D II, III and IV only
A 12 C 36 gas? II, III dan IV sahaja
B 24 D 48 [Relative atomic mass: H, 1; N, 14;
molar volume: 24 dm3 mol–1 at room 21 Relative atomic mass of calcium and
14 temperature] bromine are 40 and 80 respectively.
20 cm3 gas nitrogen dan 60 cm3 gas hidrogen Which of the following statements are
bertindak balas dengan lengkap untuk not true?
menghasilkan gas ammonia pada suhu bilik. Jisim atom relatif bagi kalsium dan bromin
Antara langkah pengiraan yang berikut, masing-masing ialah 40 dan 80. Antara
manakah mewakili formula empirik bagi gas pernyataan yang berikut, manakah tidak
Diagram 1 Rajah 1 ammonia itu? benar?
[Jisim atom relatif: H, 1; N, 14; isi padu I 2 atoms of calcium have same
Diagram 1 shows a syringe molar: 24 dm3 mol–1 pada suhu bilik]
containing x g of carbon dioxide gas atomic mass as 1 molecule of
at room temperature. Calculate the No. of moles of No. of moles of bromine gas.
value of x. nitrogen hydrogen 2 atom kalsium mempunyai jisim yang
Bilangan mol Bilangan mol sama dengan satu molekul gas bromin.
[Relative atomic mass: C, 12; O, 16; nitrogen hidrogen II 2 g of calcium have same number
molar volume = 24 dm3 mol–1 at of atoms as 1 g of bromine gas.
room temperature] A 2 g kalsium mempunyai bilangan atom
Rajah 1 menunjukkan picagari yang yang sama dengan 1 g gas bromin.
mengandungi x g gas karbon dioksida pada III The mass of calcium is 40 g and
suhu bilik. Hitungkan nilai x.
[Jisim atom relatif: C, 12; O, 16; isi padu B the mass of bromine is 160 g.
molar = 24 dm3 mol–1 pada suhu bilik] Jisim kalsium ialah 40 g dan jisim bromin
ialah 160 g.
A 0.11 C 0.44
IV 4 moles of calcium have same
B 0.33 D 0.52 C
mass as 2 moles of bromine gas.
4 mol kalsium mempunyai jisim yang
15 A compound X contains 19.2% of sama dengan 2 mol gas bromin.
copper and 80.8% of iodide. Find D A I and II only
the mass of copper if the mass of the I dan II sahaja
compound X is 60 g. B II and IV only
II dan IV sahaja
[Relative atomic mass: Cu, 64; I, 19 Which of the following gases has the C I, II and IV only
127] lowest density at room temperature? I, II dan IV sahaja
Sebatian X mengandungi 19.2% kuprum dan
[Relative atomic mass: H, 1; C, 12; D I, II, III and IV
80.8% iodida. Cari jisim kuprum jika jisim
sebatian X ialah 60 g. N, 14; O, 16] I, II, III dan IV
[Jisim atom relatif: Cu, 64; I, 127] Antara gas-gas yang berikut, manakah
mempunyai ketumpatan yang paling rendah
A 11.5 g C 48.5 g 22
pada suhu bilik?
B 19.2 g D 80.8 g [Jisim atom relatif: H, 1; C, 12; N, 14; O, 16]
A O2 C H2
16 0.14 mole of an unknown gas X2 has a B CO2 D N2 The equation above shows the
mass of 1.4 g. What is the relative decomposition of metal P when it is
atomic mass of X? heated. Calculate the mass of
20 Which of the following statement is true
0.14 mol gas X2 mempunyai jisim 1.4 g. carbonate of metal P which is used
about one mole of oxygen gas and
Berapakah jisim atom relatif bagi X? to produce 336cm3 of carbon dioxide
A 2.5 C 10.0 one mole of ethane gas?
Antara pernyataan yang berikut, manakah
gas at s.t.p.
B 5.0 D 15.0 benar tentang satu mol gas oksigen dan satu [Relative atomic mass: C, 12; O, 16;
mol gas etana? P, 64; molar volume: 22.4 dm3 mol–1
17 0.3 mole of X combined with 9.6 g I They have same volume at room at s.t.p.]
of oxygen to form X oxide, where X temperature. Persamaan di atas menunjukkan penguraian
Mempunyai isi padu yang sama pada logam P apabila dipanaskan. Hitungkan jisim
is an element. What is the empirical karbonat bagi logam P yang digunakan untuk
suhu bilik.
formula for X oxide? II They have same number of menghasilkan 336cm3 gas karbon dioksida
[Relative atomic mass: O, 16] atoms.
pada s.t.p.
0.3 mol X bergabung dengan 9.6 g oksigen [Jisim atom relatif: C, 12; O, 16; P, 64; isi
Mempunyai bilangan atom yang sama. padu molar: 22.4 dm3 mol–1 pada s.t.p.]
untuk menghasil X oksida, di mana X ialah
satu unsur. Apakah formula empirik bagi X III They are alcohol. A 0.02 g C 4.82 g
oksida? Merupakan alkohol.
B 1.86 g D 6.22 g
[Jisim atom relatif: O, 16]
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UJIAN TOPIKAL 3: FORMULA DAN PERSAMAAN KIMIA
PAPER 1 KERTAS 1
2H2O2 (aq) → 2H2O (l) + O2 (g)
23
2H2O2 (ak) → 2H2O (ce) + O2 (g)
CaCO3 → CaO + CO2 The equation above shows the
decomposition of hydrogen
Calcium carbonate decomposes peroxide, H2O2. Which of the
when it is heated. According to the following amount of substances are Diagram 2 Rajah 2
equation above, what is the mass of produced when 0.02 mole of Diagram 2 shows the set-up of the
calcium oxide formed when 10 g of hydrogen peroxide is decomposed apparatus to determine the empirical
calcium carbonate is burnt completely? completely at s.t.p.? formula of a copper (II) oxide.
[Relative atomic mass: C, 12; O, 16; [Molar volume at s.t.p.: 22.4 dm3 mol–1] Which of the following gas is
Ca, 40] Persamaan di atas menunjukkan penguraian suitable to be used in the Diagram 2?
Kalsium karbonat terurai apabila hidrogen peroksida, H2O2. Antara jumlah Rajah 2 menunjukkan susunan radas untuk
dipanaskan. Berdasarkan persamaan di atas, bahan yang berikut, manakah akan menentukan formula empirik kuprum (II)
berapakah jisim kalsium oksida yang dihasilkan apabila 0.02 mol hidrogen oksida. Antara gas yang berikut, manakah
dihasilkan apabila 10 g kalsium karbonat peroksida diurai selengkapnya pada s.t.p.? sesuai diguna dalam Rajah 2?
dibakar selengkapnya? [Isi padu molar pada s.t.p.: 22.4 dm3 mol–1]
[Jisim atom relatif: C, 12; O, 16; Ca, 40]
A Hydrogen gas
I 0.01 mole of water Gas hidrogen
A 0.4 g C 5.6 g 0.01 mol air
B Oxygen gas
B 0.6 g D 8.0 g II 0.22 dm3 of oxygen gas Gas oksigen
0.22 dm3 of gas oksigen
21 C Carbon dioxide gas
24 III 6.02 × 10 of oxygen gas Gas karbon dioksida
molecule D Nitrogen gas
2Al2O3 → 4Al + 3O2 6.02 × 1021 molekul gas oksigen Gas nitrogen
IV 1.2 × 1020 of water molecules
The equation above shows the 1.2 × 1020 molekul air
30
reaction of the extraction of A I and II only C II and III only
aluminium from aluminium oxide. I dan II sahaja II dan III sahaja
Calculate the mass of aluminium B I and IV only D III and IV only
I dan IV sahaja III dan IV sahaja
oxide when 108 g of aluminium is
extracted from the reaction.
[Relative atomic mass: O,16; Al, 27] 27 The formula of the sulphate salt of X is
Persamaan di atas menunjukkan tindak balas XSO4. What is the formula of the
pengekstrakan aluminium daripada nitrate salt of X?
aluminium oksida. Hitungkan jisim Formula bagi sulfat garam X ialah XSO 4.
aluminium oksida yang digunakan apabila Apakah formula bagi garam nitrat X?
108 g aluminium diekstrak daripada tindak A XNO3 C X(NO3)2
balas itu.
[Jisim atom relatif: O, 16; Al, 27] B X2NO3 D X2(NO3)2
Diagram 3 Rajah 3
A 102 g C 204 g 28 Which of the substances below is
Diagram 3 shows the set-up of
B 180 g D 306 g matched with the correct relative
apparatus to determine the empirical
molecular mass?
formula of an oxide of lead. Which
[Relative atomic mass: H, 1; C, 12;
25 of the following are correct in the
O, 16; Na, 23; S, 32; Cl, 35.5; K, 39;
Element X O set-up of apparatus for this
Cr, 52; Ba, 137]
Unsur Antara bahan di bawah, manakah
experiment?
dipadankan dengan jisim molekul relatif yang Rajah 3 menunjukkan susunan radas untuk
Mass/g 1.08 0.96 betul? menentukan formula empirik bagi suatu
oksida plumbum. Antara yang berikut,
Jisim/g [Jisim atom relatif: H, 1; C, 12; O, 16; Na,
23; S, 32; Cl, 35.5; K, 39; Cr, 52; Ba, 137] manakah betul tentang susunan radas
eksperimen itu?
Relative atomic mass 27 16 Substance Relative I No Bunsen burner
Jisim atom relatif Bahan molecular mass Tiada penunu Bunsen
Table 2 Jadual 2 Jisim molekul relatif II The using of oxide of lead
Table 2 shows the mass and the Penggunaan oksida plumbum
A BaCl2.2H2O 244 III Fixing of the combustion tube
relative atomic mass of the element
Pemasangan tabung pembakaran
X and O. What is the empirical B Na2S2O3.5H2O 185
IV Position of the thistle funnel
formula for this oxide? Kedudukan corong tisel
Jadual 2 menunjukkan jisim dan jisim atom
C C3H7COOH 81
relatif bagi unsur X dan O. Apakah formula
A I and II only
D K2Cr2O7 292 I dan II sahaja
empirik bagi oxida itu?
A XO C X2O3 B II and III only
29 II dan III sahaja
B X2O D X3O2 C III and IV only
III dan IV sahaja
26 D I, II and III only
I, II dan III sahaja
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di sini TOPICAL TEST 3: CHEMICAL FORMULAE AND EQUATIONS
UJIAN TOPIKAL 3: FORMULA DAN PERSAMAAN KIMIA
PAPER 1 KERTAS 1
Section A Bahagian A
PAPER 2 KERTAS 2
1 (c) Why should the crucible lid be opened once in a while
during the experiment?
Mengapakah penutup mangkuk pijar dibuka sekali-sekala semasa
eksperimen?
________________________________________________________
[2 marks / 2 markah]
(d) Based on the results above,
Berdasarkan keputusan di atas,
(i) calculate the mass of magnesium used and the
mass of oxygen that has reacted with the
magnesium.
hitungkan jisim magnesium yang digunakan dan jisim oksigen
yang telah bertindak balas dengan magnesium.
Diagram 1 Rajah 1 ___________________________________________________
Diagram 1 shows the set-up of apparatus for an experiment [2 marks / 2 markah]
to determine the empirical formula of magnesium oxide. (ii) determine the empirical formula of magnesium
Rajah 1 menunjukkan susunan radas bagi satu eksperimen untuk oxide.
menentukan formula empirik magnesium oksida.
tentukan formula empirik magnesium oksida.
___________________________________________________
Result [2 marks / 2 markah]
Keputusan
(e) Write the chemical equation for the reaction in this
experiment.
Mass of crucible + lid = 26.6 g Tuliskan persamaan kimia bagi tindak balas dalam eksperimen itu.
Jisim mangkuk pijar + penutup ________________________________________________________
[1 mark / 1 markah]
(f) What is the precaution needed in this experiment?
Mass of crucible + lid + magnesium ribbons = 27.2 g Apakah langkah berjaga-jaga yang diperlukan dalam eksperimen itu?
Jisim mangkuk pijar + penutup + pita magnesium ________________________________________________________
[1 mark / 1 markah]
Mass of crucible + lid + magnesium oxide = 27.6 g 2 (a) (i) What is meant by relative atomic mass based on
Jisim mangkuk pijar + penutup + magnesium oksida
the carbon-12 scale?
Apakah yang dimaksudkan dengan jisim atom relatif
berdasarkan skala karbon-12?
(a) What is meant by empirical formula? ___________________________________________________
Apakah yang dimaksudkan dengan formula empirik? [1 mark / 1 markah]
________________________________________________________ (ii) What is meant by relative molecular mass based
[1 mark / 1 markah] on the carbon-12 scale?
(b) State the purpose of cleaning the magnesium ribbon Apakah yang dimaksudkan dengan jisim molekul relatif
with sand paper. berdasarkan skala karbon-12?
___________________________________________________
Nyatakan tujuan membersihkan pita magnesium dengan kertas pasir.
________________________________________________________ [1 mark / 1 markah]
[1 mark / 1 markah] (iii) State one reason why carbon-12 was chosen as the
standard atom.
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UJIAN TOPIKAL 3: FORMULA DAN PERSAMAAN KIMIA
PAPER 1 KERTAS 1
Nyatakan satu sebab mengapa karbon-12 dipilih sebagai atom (a) (i) Write down the molecular formula of aspirin.
piawai. Tuliskan formula molekul bagi aspirin.
___________________________________________________ __________________________________________________
[1 mark / 1 markah] [1 mark / 1 markah]
(b) (i) Define Avogadro’s constant.
Takrifkan pemalar Avogadro.
(ii) Calculate the mass of 0.05 mole aspirin.
___________________________________________________
Hitungkan jisim bagi 0.05 mol aspirin.
[1 mark / 1 markah] _________________________________________________________
(ii) A sample of zinc contains of 3 × 1022 zinc atoms. [2 marks / 2 markah]
How many moles of zinc are there in this sample? (b)
[Avogadro constant: 6 × 1023 mol–1]
Satu sample zink mengandungi 3 × 1022 atom zink. Berapa mol
bagi zink yang terdapat dalam sampel itu?
[Pemalar Avogadro: 6 × 1023 mol–1]
___________________________________________________
[2 marks / 2 markah]
(c) 0.02 mole of a hydrocarbon was completely burnt in air
Diagram 3 Rajah 3
and 2.4 dm3 of carbon dioxide was released at standard
temperature and pressure. Diagram 3 shows the structural formula of vitamin C.
Rajah 3 menunjukkan formula struktur bagi vitamin C.
0.02 mol hidrokarbon dibakar selengkapnya dalam udara dan 2.4
dm3 karbon dioksida dibebaskan pada suhu dan tekanan piawai. (i) What is the molecular formula of vitamin C?
Apakah formula molekul vitamin C?
(i) Calculate the number of molecules in 0.02 mole of
hydrocarbon.
Hitungkan bilangan molekul yang terkandung dalam 0.02 mol ___________________________________________________
hidrokarbon. [1 mark / 1 markah]
___________________________________________________ (ii) What is the empirical formula of vitamin C?
[1 mark / 1 markah] Apakah formula empirik vitamin C?
(ii) Calculate the number of moles of 2.4 dm 3 of ___________________________________________________
carbon dioxide. [1 mark / 1 markah]
Hitungkan bilangan mol bagi 2.4 dm3 karbon dioksida. (iii) Compare the molecular formula and empirical
___________________________________________________ formula of vitamin C.
[1 mark / 1 markah] Bandingkan formula molekul dan formula empirik bagi vitamin C.
(iii) Calculate the volume of carbon dioxide released at ___________________________________________________
s.t.p. from one mole of hydrocarbon. [2 marks / 2 markah]
Hitungkan isi padu karbon dioksida yang dibebaskan pada (iv) State the molar mass of vitamin C.
s.t.p. daripada satu mol hidrokarbon. Nyatakan jisim molar bagi vitamin C.
___________________________________________________ ___________________________________________________
[1 mark / 1 markah] [1 mark / 1 markah]
(v) Calculate the percentage of oxygen by mass in a
3 molecule of vitamin C.
Hitungkan peratus jisim oksigen dalam satu molekul vitamin C.
___________________________________________________
[1 mark / 1 markah]
(c) Given that the empirical formula of X is CH2O and its
relative molecular mass is 60. Find the molecular
formula of X.
Diberi formula empirik X ialah CH2O dan jisim molekul relatifnya
Diagram 2 Rajah 2 ialah 60. Cari formula molekul X.
Diagram 2 shows the structural formula of aspirin. ________________________________________________________
Rajah 2 menunjukkan formula struktur bagi aspirin. [2 marks / 2 markah]
Section B Bahagian B
4 (a) State the meaning of ‘molar mass’ of a substance by mole of hydrogen gas at room condition and
using two suitable examples. standard temperature and pressure.
Nyatakan maksud ‘jisim molar’ bagi satu bahan dengan Berapakah isi padu molar gas pada s.t.p. dan keadaan bilik?
menggunakan dua contoh yang sesuai. Hitungkan isi padu 0.5 mol gas hidrogen pada keadaan bilik
[3 marks / 3 markah] dan suhu dan tekanan piawai.
(b) (i) State the meaning of ‘molar volume’ of a gas by [4 marks / 4 markah]
using suitable example. (iii) Explain why is the molar volume of gas different
Nyatakan maksud ‘isi padu molar’ bagi satu gas dengan in these two conditions.
menggunakan contoh yang sesuai. Jelaskan mengapa isi padu molar gas berbeza dalam kedua-
[3 marks / 3 markah] dua keadaan ini.
(ii) What is the molar volume of gas at s.t.p. and [2 marks / 2 markah]
room condition? Calculate the volume of 0.5
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UJIAN TOPIKAL 3: FORMULA DAN PERSAMAAN KIMIA
PAPER 1 KERTAS 1
(c) A hydrocarbon compound, X contains 86% of carbon Hitungkan formula molekul sebatian X dengan menggunakan
jawapan anda dalam (c)(i).
and 14% of hydrogen. Given that the relative
molecular mass of the compound X is 70. [2 marks / 2 markah]
Satu sebatian hidrokarbon, X mengandungi 86% karbon dan 14% (iii) Draw one of the structural formula of the
hidrogen. Diberi jisim molekul relatif sebatian X ialah 70. compound X and name it.
(i) Calculate the empirical formula of compound X. Lukis dan namakan satu formula struktur sebatian X.
Hitungkan formula empirik sebatian X. [2 marks / 2 markah]
[3 marks / 3 markah]
(ii) Calculate the molecular formula of the
compound x by using your answer in (c)(i).
Section C Bahagian C
5 (a) (i) Explain what is meant by ‘empirical formula of a
compound’.
Jelaskan apakah yang dimaksudkan ‘formula empirik bagi
satu sebatian’.
[1 mark / 1 markah]
(ii) Write down the empirical formula for vitamin C,
C6H8O6 and ammonia gas, NH3.
Tuliskan formula empirik bagi vitamin C, C6H8O6 dan gas
ammonia, NH3.
[2 marks / 2 markah]
(b) (i) A sample of green oxide of chromium is given.
With the aid of a labelled diagram, describe a
laboratory experiment to determine the empirical
formula for oxides of chromium. Your
experiment should also include observations,
tabulation of results, calculations and all
precautions and safety taken.
Satu sampel oksida kromium hijau diberi. Dengan bantuan rajah
yang berlabel, huraikan satu eksperimen di makmal untuk
menentukan formula empirik oksida kromium. Eksperimen anda
hendaklah mengandungi pemerhatian, penjadualan keputusan,
pengiraan dan semua langkah-langkah berjaga yang perlu diambil.
[10 marks / 10 markah]
(ii) State the reason why the empirical formula for
the oxide of chromium cannot be determined by
heating this solid oxide with magnesium powder.
Nyatakan sebab mengapa formula empirik oksida kromium
tidak boleh ditentu dengan pemanasan pepejal oksida
dengan serbuk magnesium.
[3 marks / 3 markah]
(c) Given that the relative molecular mass of gas X is 72.
Gas X and gas Y are hydrocarbons.
Diberi jisim molekul relatif gas X ialah 72. Gas X dan gas Y ialah
hidrokarbon.
(i) If the formula of gas X is CnH12, what is the value
of n? Name the gas X.
Jika formula gas X ialah C nH12, apakah nilai n? Namakan
gas X.
[2 marks / 2 markah]
(ii) Deduce the formula of gas Y, if the relative
molecular mass of gas Y is 42. Name the gas Y.
Mentaabirkan formula gas Y, jika jisim molekul relatif gas Y
ialah 42. Namakan gas Y.
[2 marks / 2 markah]
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