[email protected] soalan KBAT TEKNIK MENJAWAB
SOALAN-SOALAN KBATSPM 2015 PENTAKSIRAN DIAGNOSTIK AKADEMIK SEKOLAH
KLUSTER KECEMERLANGAN Written by: Cikgu Marzuqi Mohd Salleh MODUL
KHAS Siri 1: Aplikasi Mol dan Persamaan Kimia Mol applications and
Chemical Equations Nama: . Nama sekolah: ...
[email protected] soalan KBAT 1.Seimbangkan persamaan
kimia yang berikut: Balance the following chemical equation: i)
Na2CO3(ak) + AgNO3(ak) NaNO3(ak) +Ag2CO3(ak) ii) NaOH(ak) +
H2SO4(ak) Na2SO4(ak) + H2O(ce) iii) Ca(OH)2(ak)+ HNO3(ak)
Ca(NO3)2(ak)+H2O(ce) iv) Al2O3+H2SO4 Al2(SO4)3 + H2O iv)NH3+ CuO
Cu+N2 + H2O [5 markah] 2.Tindak balas antara hidrazina, N2H4 dengan
hidrogen peroksida H2O2 ialah seperti berikut: The reaction between
hydrazine, N2H4 and hydrogen peroxide H2O2 is as follows:
7H2O2+N2H4 2HNO3 + 8H2O (i)Berapakah mol HNO3 terbentuk daripada
0.05 mol N2H4? How many moles of HNO3 formed from 0.05 moles of
N2H4? (ii) Berapakah jirim H2O2 diperlukan untuk menghasilkan 45.8
g HNO3? What is the substance of H2O2 needed to produce 45.8 g
HNO3? [Jirim Atom Relatif; H = 1, N = 14, O = 16] [4 markah]
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3.Tindakbalasantaranatriumklorida,NaCIdenganasidsulfurik,H2SO4adalahseperti
berikut: The reaction between sodium chloride, NaCl and sulfuric
acid, H2SO4 are as follows: NaCI +H2SO4 NaHSO4+HCI Jika 87.8 g NaCI
ditindakbalaskan dengan H2SO4, If 87.8 g NaCl reacted with H2SO4,
[Jirim Atom Relatif; Na =23, Cl =35.5, H = 1, S = 32, O = 16](i)
Berapakah jisim HCI yang terhasil? What is the mass of HCI
produced? [2 markah] (ii) Berapakah isi padu H2SO4 yang diperlukan
dalam tindak balas di atas dalam unit cm3? What is the volume of
H2SO4 is required above reaction in cm3 unit? [1 mol gas menepati
24 dm3 pada keadaan bilik] [2 markah]
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4.Satusampelbajadidapatimengandungi36.5%nitrogen.Jikajisimbajatersebutadalah
200g, tentukan bilangan atom nitrogen yang terkandung di dalamnya.
One sample found to 36.5% of fertilizer nitrogen. If the mass of
fertilizer is 200g, determine the number of nitrogen atoms
contained therein. [NA = 6.02 x 1023 g mol-1][JAR: N = 14] 36.5/
100 = 0.365 = 0.365 x 200g = 73.0 g N= 73.0 / 14 = 5.21 mol = 6.21
x 1 x 6.02 x 1023 = 3.738 x 1024 atom [2 markah] 5.Diberi /
given,2Al+Fe2O3 AI2O3+ 2Fe Kirakan jisim Al dan Fe2O3 yang
diperlukan untuk menghasilkan 4.0g Fe. Calculate the mass of Al and
Fe2O3 needed to produce 4.0g of Fe. [3 markah]
6.Suatuunsuryangtidakdikenalibertindakbalasdenganoksigenuntukmembentuksebatian
RO2. Jika 44.0g unsur R bertindak balas dengan 8.0g oksigen,
kirakan jisim atom relatif R.
AnelementthatisunknowntoreactwithoxygentoformcompoundsRO2.If44.0gofR
reacted with 8.0g of oxygen, calculate the relative atomic mass R.
[3 markah][email protected] soalan KBAT 7. Apabila
etana, C2H6 terbakar dalam udara berlebihan, gas CO2 dan H2O
dihasilkan. Persamaan tindak balas adalah seperti berikut:
Whenethane,C2H6burnedinexcessair,CO2andH2Oareproduced.Reactionequationisas
follows: 2C2H6+7O2 4CO2+6H2O Jika 2.5 mol etana digunakan,
tentukan: If 2.5 mole of ethane used, calculate: i) Jisim gas CO2
yang terhasil / mass of CO2 gas produced. [2 markah] ii) Isi padu
gas oksigen yang digunakan pada keadaan s.t.p dalam cm3 The volume
of oxygen gas used at s.t.p condition in cm3 [1 mol gas pada s.t.p
menempati 22.4 dm3] [2 markah] iii) Bilangan atom air. Number of
water atom. [NA= 6.02 x 1023] [2 markah]
[email protected] soalan KBAT 8(a)Apakah formula
molekul bagi sebatian yang mengandungi 71.5% Hg, 5.0% N, 17.1% O
dan selebihnya adalah molekul H2O. Jisim molekul sebatian diketahui
sebagai 561.2.
Whatisthemolecularformulaofacompoundcontained71.5%Hg,5.0%N,17.1%O
and the rest is H2O molecules. Molecular mass compounds known as
561.2. [4 markah] (b)Diberi jisim molekulnikotin ialah 162.1g yang
mengandungi 74.0 % karbon, 8.7%hidrogen dan selebihnya adalah
nitrogen. Apakah formula molekul bagi nikotin? Given the mass of
nicotine molecule is 162.1g contained 74.0% carbon, 8.7% hydrogen
and the rest is nitrogen. What is the molecular formula of
nicotine? [2 markah] [email protected] soalan KBAT 8
(a)Persamaan kimia berikut mewakili tindak balas antara magnesium
oksida dan asid sulfurik. The following chemical equation
represents the reaction between magnesium oxide and sulphuric acid.
MgO + H2SO4 MgSO4 +H2O (i)Perihalkan secara ringkas persamaan kimia
di atas. Explain briefly the chemical equation above. [2 markah / 2
marks] (ii)Apakah jisim magnesium sulfat yang terbentuk apabila 2.0
g serbuk magnesium oksida bertindak balas dengan asid sulfurik
berlebihan?
Whatisthemassofmagnesiumsulphateformedwhen2.0gofmagnesiumoxidepowderis
reacted with excess sulphuric acid? [Jisim molar: (MgO)n = 80;
(MgSO4)n = 240] [Molar mass: (MgO)n = 80; (MgSO4)n= 240] [2 markah
/ 2 marks] (iii) Nyatakan nisbah bilangan mol antara magnesium
oksida dengan magnesium sulfat. State the ratio between the number
of moles of magnesium oxide and magnesium sulphate. [1 markah / 1
mark] (b)Persamaan berikut mewakili tindak balas antara magnesium
oksida dengan asid nitrik. The following equation represents the
reaction between magnesium oxide and nitric acid. MgO + 2HNO3
Mg(NO3)2+ H2O (i)Magnesium oksida yang berlebihan bertindak balas
dengan 50 cm3 asid nitrik 2.0 mol dm-3. Apakah jisim maksimum garam
magnesium nitrat yang terbentuk? Excess magnesium oxide is reacted
with 50 cm3 of 2.0 mole dm-3 nitric acid. What is the maximum mass
of magnesium nitrate salt formed? [Jisim atom relatif: N = 14, O =
16, Mg = 24] [Relative atomic mass: N = 14, O = 16, Mg = 24] [3
markah / 3 marks] [email protected] soalan KBAT
Bahagian B 1. Sebiji nenas mengandungi vitamin C, Rajah 1 di bawah
menunjukkan formula struktur bagi vitamin C. A pineapple contains
vitamin C, Diagram 1 below shows the structural formula of vitamin
C. Rajah 1 / Diagram 1 (a)Berdasarkan Rajah di atas, berikan
definisi formula empirik dan formula molekul. Based on Diagram,
define empirical formula and molecular formula. [2 markah / 2
marks] (b)Apakah formula empirik itu? What is the empirical
formula?[1 markah / 1 mark] (c)Perihalkan formula empirik di atas.
Explain the empirical formula above. [1 markah / 1 mark] (d)Jisim
molekul relatif bagi Vitamin C ialah 176. Apakah formula molekul
bagi Vitamin C itu? Relative molecular mass of Vitamin C is 176.
What is the molecular formula of Vitamin C? [Jisim atom relatif; H
= 1, C =12, O =16] [1 markah / 1 mark] (e)Jika 17 g formula
empirik, hitungkan.If 17 g empirical formula, calculate.
(i)bilangan molekul the number of molecules (ii)peratusan oksigen
dalam vitamin itu the percentage of oxygen in vitamin (iii) nama
sebatian ituname the compound[5 markah / 5 marks] (f)Cadangkan satu
buah yang mengandungi formula empirik yang sama seperti di
atas.Suggest onefruit that contains the same empirical formula as
above. [1 markah / 1 mark] (g)Tentukan formula molekul bagi
hidrogen peroksida jika bilangan n adalah 2. Determine the
molecular formula for hydrogen peroxide if the number n is 2.[2
markah / 2 marks]
