1) The mass of one atom of element A is two times more than an atom of carbon-12. What is the relative atomic mass of element A? [Relative atomic mass: C=12] a) 12 b) 24 c) 288 d) 298 2) What is the relative molecular mass for CO2 ? [Relative atomic mass: C=12, O=16] a) 28 b) 30 c) 44 d) 24 3) Relative molecular mass for M2SO4 is 142. What is the relative atomic mass for M? [Relative atomic mass: O=16, S=32]   a) 23 b) 54 c) 118 d) 32 4) Calculate the relative molecular mass for Copper(II) Sulphate. [Relative atomic mass: Cu=64, S=32, O=16] a) 160 b) 185 c) 150 d) 124 5) Calculate the relative molecular mass for Al2(SO4)3. [Relative atomic mass: Al=27, S=32, O=16] a) 342 b) 352 c) 340 d) 370 6) What is the formula to calculate the number of moles of a solid? a) n=MV b) Mole=Volume/Molar volume c) Mole=Mass/molar mass 7) What is the formula to calculate the number of moles of a solution? a) n=MV b) Mole=Volume/Molar volume c) Mole=Mass/Molar mass 8) What is the formula to calculate the number of moles of a gas? a) n=MV b) Mole=Volume/Molar volume c) Mole=Mass/Molar mass 9) Calculate the number of molecules of 14.2 g of chlorine gas, Cl2. [Relative atomic mass: Cl=35.5] a) 1.204 X 1024 b) 1.204 X 1023 c) 2.204 X 1023 d) 2.204 X 1024 10) Given the mass of carbon is 14.09 g. What is the amount of mole for carbon? [Relative atomic mass: C=12] a) 1.1742 moles b) 2.0542 moles c) 1.0639 moles d) 2.1784 moles 11) A sample of MgBr2 contains 1.03 X 1023 units of MgBr2. Calculate the number of moles of MgBr2 that found in the sample. a) 0.2433 moles b) 0.1832 moles c) 0.1711 moles d) 0.6421 moles 12) How many moles in the 32 g of carbon dioxide gas, C02? [Relative atomic mass: C=12, O=16] a) 0.4012 moles b) 0.7273 moles c) 0.6773 moles d) 0.4013 moles 13) Calculate the volume of 0.32 moles of ammonia gas, NH3, in dm3, at room conditions. [Molar volume of gas: 24 dm3 at room conditions] a) 7.18 dm3 b) 4.92 dm3 c) 5.01 dm3 d) 7.68 dm3 14) What is the volume for 22.6 g of CO2 at room conditions? [Relative atomic mass: C=12, O=16] [Molar volume of gas: 24 dm3 at room conditions] a) 10.44 dm3 b) 12.33 dm3 c) 15.40 dm3 d) 14.00 dm3 15) What is the definition of empirical formula? a) A formula that shows the simplest whole number ratio of atoms of each element. b) A formula that shows the actual number of atoms of each element that are present in a molecule of the compound. c) The total number of protons and neutrons in an atomic nucleus. 16) The molecular formula for glucose is C6H12O6. What is the empirical formula for glucose? a) CHO b) C6H12O6 c) CH2O d) C3H6O3 17) What is the empirical formula for methane, CH4? a) CH2 b) CH c) CH4 d) C⅟4H 18) What is the definition of molecular formula? a) The total number of protons and neutrons in an atomic nucleus. b) A formula that shows the simplest whole number ratio of atoms of each element. c) A formula that shows the actual number of atoms of each element that are present in a molecule of the compound. 19) The empirical formula of compound X is C2H6O and the relative molecular mass is 138. Determine the molecular formula for this compound. [Relative atomic mass: C=12, H=1, O=16] a) C10H30O5 b) C8H24O4 c) C4H12O2 d) C6H18O3 20) Calculate the percentage composition by mass of nitrogen for (NH4)2SO4. [Relative atomic mass: N=14, H=1, S=32, O=16] a) 81.43% b) 21.21% c) 80.15% d) 22.21% 21) What is the percentage by mass of natrium in natrium sulphate, Na2SO4? [Relative atomic mass: Na=23, S=32, O=16] a) 10.77% b) 41.76% c) 32.39% d) 40.33% 22) What is the result of reaction between acid and base? Acid + Base → ? a) Salt, water, carbon dioxide b) Salt, hydrogen gas c) Salt, water 23) What is the result of reaction between acid and carbonate metal? Acid + Carbonate metal → ? a) Salt, water b) Salt, water, carbon dioxide c) Salt, hydrogen gas 24) Which is the balanced chemical equation for the reaction between zinc, Zn and hydrochloric acid, HCl ? a) Zn (s) + HCl (aq) → ZnCl2 (aq) + H2 (g) b) Zn (s) + 2HCl (aq) → ZnCl2 (aq) + H2 (g) c) Zn (s) + 2HCl (aq) → 2ZnCl (aq) + H2 (g) 25) Which one is the right balanced chemical equation for the reaction given? a) BaCO3 (s) + 2HNO3 (aq) → Ba(NO3)2 (aq) + CO2 (g) + H2O (l)  b) 2BaCO3 (s) + HNO3 (aq) → Ba(NO3)2 (aq) + CO2 (g) + H2O (l) c) BaCO3 (s) + HNO3 (aq) → Ba(NO3)2 (aq) + 4CO2 (g) + H2O (l) 26) What is the relative molecular mass for the reaction? [Relative atomic mass: H=1, N=14] a) 2 b) 17 c) 28 d) 32 27) What are the products produced when H2SO4 reacted with Mg? a) Magnesium sulphate + Hydrogen gas b) Magnesium sulphate + Water c) Magnesium sulphate + Nitrogen dioxide d) Magnesium sulphate + Nitrogen oxide 28) The diagram shows the arrangement of the apparatus for determining the empirical formula of a metal oxide. Which of the following metal oxides is not suitable for use in experiment? a) Zinc oxide b) Plumbum(II) oxide c) Copper(II) oxide 29) The diagram shows an experiment to determine the empirical formula of magnesium oxide. Why do we need to lift the crucible lid from time to time during the experiment? a) To make sure magnesium is react completely with hydrogen gas b) To remove oxide layer on the surface of the magnesium ribbon c) To allow oxygen from the air to react with magnesium 30) Which one is the balanced chemical equation for this reaction? a) CuO (s) + 2HCl (aq) → CuCl2 (aq) + H2O (l) b) 2CuO (s) + HCl (aq) → CuCl2 (aq) + H2O (l) c) CuO (s) + 2HCl (aq) → 2CuCl2 (aq) + H2O (l) d) CuO (s) + 2HCl (aq) → CuCl2 (aq) + 2H2O (l)

Chemical Formula and Equations

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