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WorksheetsUnit 3: The Mole Concept, Chemical Formula and Equation
Total questions: 10
Worksheet time: 21mins
Which chemical equations is balanced?
Persamaan kimia manakah yang seimbang?
NaOH (aq) + H2SO4 (aq) → Na2SO4 (aq) +H2O (l)
Zn(NO3)2 (s) → ZnO (s) + 2NO2 (g) + O2(g)
Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)
CaCO3 (s) → CaO (s) + 2CO2 (g)
Equation above show the process of decomposition of hydrogen peroxide. Which of the following statement is correct?
Persamaan di atas mewakili proses penguraian hidrogen peroksida. Pernyataan yang manakah benar?
The product of the reaction is oxygen
Hasil tindak balas adalah oksigen
The reactant are water and oxygen
Bahan tindak balas adalah air dan oksigen
Three moles of hydrogen peroxide is decomposed into two moles of water and one mole of oxygen
Tiga mol hidrogen peroksida terurai kepada dua mol air dan satu mol oksigen
Hydrogen peroxide burn and produce water and oxygen
Hidrogen peroksida terbakar dan menghasilkan air dan oksigen
Boric acid is used to produce fibre glass textile. What is the chemical formula of boric acid?
Asid borik digunakan dalam penghasilan tekstil kaca gentian. Apakah formula kimia bagi asid borik?
H3B
H2SO4
H3B2
H3BO3
Which of the following is M?
Antara berikut, yang manakah M?
Copper(II) carbonate
Kuprum(II) karbonat
Copper
Kuprum
Copper(II) hydroxide
Kuprum(II) hidroksida
Copper(II) oxide
Kuprum(II) oksida
Insect repellent has the formula of CH3(CH2)5CHCHCHO. Determine the relative molecular mass of this substance.
[Relative atomic mass: H = 1; C = 12; O = 16]
Penyembur serangga mempunyai formula CH3(CH2)5CHCHCHO. Tentukan jisim molekul relatif bagi bahan ini.
[Jisim atom relatif: H = 1; C = 12; O = 16]
110
120
130
140
What is the molecular formula of compound with empirical formula C2H4O?
Apakah formula molekul sebatian dengan formula empirik C2H4O?
C3H7COOCH3
C3H7COOH
C4H9COOH
C2H5OH
Element X and element Y have proton number of 19 and 8 respectively. What is the relative molecular mass of a compound formed between X and Y?
[Relative atomic mass : X = 39 ; Y = 16]
Unsur X dan unsur Y masing-masing mempunyai nombor proton 19 dan 8. Berapakah jisim molekul relatif bagi sebatian yang terbentuk antara X dan Y?
[Jisim atom Relatif : X = 39 ; Y = 16]
94
35
46
71
When zinc carbonate powder is heated strongly, it produces colourless gas M. What is gas M?
Apabila serbuk zink karbonat dipanaskan dengan
kuat, gas tanpa warna M dihasilkan. Apakah gas M?
Hydrogen gas / Gas hidrogen
Carbon dioxide / Karbon dioksida
Inert gas / Gas adi
Oxygen gas / Gas oksigen
State the observation when gas M passed through the lime water.
Nyatakan pemerhatian apabila gas M dilalukan ke atas air kapur.
Lime water turn blue / Air kapur berubah warna ke biru
Lime water turns cloudy / Air kapur menjadi keruh
Nothing change / Tiada perubahan
Black precipitate form / Mendakan hitam terbentuk
Write the chemical equation for the reaction in the experiment above.
Tuliskan persamaan kimia bagi tindak balas yang berlaku dalam eksperimen di atas.
ZnO3 → ZnO + CO2
ZnCO2 → ZnO + CO2
ZnCO3 → ZnO + CO2
Zn → ZnO + CO2
