Chemistry form 4 topical Question 3

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Chemistry form 4 topical Question 3

  1. 1. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah 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© Navision (M) Sdn. Bhd. (690640-P) 12 SULIT
  2. 2. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 3: CHEMICAL FORMULAE AND EQUATIONS 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 yang15 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 H216 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–117 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]© Navision (M) Sdn. Bhd. (690640-P) 13 SULIT
  3. 3. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 3: CHEMICAL FORMULAE AND EQUATIONS 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 gas24 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 sahaja26 D I, II and III only I, II dan III sahaja© Navision (M) Sdn. Bhd. (690640-P) 14 SULIT
  4. 4. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah 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 21 (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.© Navision (M) Sdn. Bhd. (690640-P) 15 SULIT
  5. 5. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 3: CHEMICAL FORMULAE AND EQUATIONS 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 a3 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 B4 (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© Navision (M) Sdn. Bhd. (690640-P) 16 SULIT
  6. 6. SULIT NAMA: _______________________________________________ TINGKATAN: ______________ Lekat logo sekolah di sini TOPICAL TEST 3: CHEMICAL FORMULAE AND EQUATIONS 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]© Navision (M) Sdn. Bhd. (690640-P) 17 SULIT

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