Stoichiometry Question Paper 1 Level IGSE Subject hemistry (0620/0971) Exam oard ambridge International Examinations (IE) Topic Stoichiometry Sub-Topic Stoichiometry ooklet Question Paper 1 Time llowed: 35 minutes Score: /29 Percentage: /100 Grade oundaries: 9 8 7 6 5 4 3 >85% 75% 68% 60% 53% 48% 40% 2 1 33% <25% 1
1 For each atom of carbon present in a molecule, there is an equal number of atoms of oxygen but twice as many atoms of hydrogen. What is the formula of the molecule? 2 2 O 2 2 2 O 4 2 4 O 2 2 6 O 2 Water is formed when 48 g of oxygen combine with 6 g of hydrogen. What mass of oxygen combines with 2 g of hydrogen? 12 g 16 g 96 g 144 g 3 Nitrogen and hydrogen react together to form ammonia. N 2 + 3 2 2N 3 When completely converted, 7 tonnes of nitrogen gives 8.5 tonnes of ammonia. ow much nitrogen will be needed to produce 34 tonnes of ammonia? 7 tonnes 8.5 tonnes 28 tonnes 34 tonnes 4 Which relative molecular mass, M r, is not correct for the molecule given? molecule M r ammonia, N 3 17 carbon dioxide, O 2 44 methane, 4 16 oxygen, O 2 16 2
5 The chemical compositions of two substances, W and X, are given. W Nal Si 3 O 8 X a(l 2Si 2 )O 8 Which statements are correct? 1 2 3 W and X contain the same amount of oxygen. W contains three times as much silicon as X. X contains twice as much aluminium as W. 1 and 2 1 and 3 2 and 3 1, 2 and 3 6 ydrogen and chlorine react as shown. 1 molecule of hydrogen + 1 molecule of chlorine 2 molecules of hydrogen chloride What is the equation for this reaction? 2 + 2l 2l 2 + 2l 2 l 2 2 + l 2 2l 2 + l 2 2 l 2 7 The relative formula mass, M r, of copper(ii) sulfate, uso 4, is 160. Which mass of sulfur is present in 160 g of copper(ii) sulfate? 16 g 32 g 64 g 128 g 8 What is the relative molecular mass (M r ) of NO 3? 5 31 32 63 3
9 compound has the formula 3 O 2. ow should the relative molecular mass, M r, of this compound be calculated? 12 + 1 + 16 3(12 + 1) + 2(12 + 16) + 1 (4 12) + (2 1) + 16 (2 12) + (4 1) + (2 16) 10 The equation for the reaction between magnesium and dilute sulfuric acid is shown. Mg + 2 SO 4 MgSO 4 + 2 M r of MgSO 4 is 120 Which mass of magnesium sulfate will be formed if 12 g of magnesium are reacted with sulfuric acid? 5g 10 g 60 g 120 g 11 Methane, 4, burns in the air to form carbon dioxide and water. What is the balanced equation for this reaction? 4 (g) + O 2 (g) O 2 (g) + 2 2 O(g) 4 (g) + 2O 2 (g) O 2 (g) + 2 2 O(g) 4 (g) + 2O 2 (g) O 2 (g) + 2 O(g) 4 (g) + 3O 2 (g) O 2 (g) + 2 2 O(g) 4
12 The formulae of compounds W, X and Y are shown. W uso 4.5 2 O X Y MgSO 4.7 2 O u(no 3 ) 2.6 2 O Which statement is correct? W contains twice as many hydrogen atoms as oxygen atoms. X contains the most oxygen atoms. Y contains the most hydrogen atoms. Y contains the same number of hydrogen and oxygen atoms. 13 Which relative molecular mass, M r, is not correct for the molecule given? molecule M r ammonia, N 3 17 carbon dioxide, O 2 44 methane, 4 16 oxygen, O 2 16 14 compound with the formula XF 2 has a relative formula mass of 78. What is element X? argon calcium neon zirconium 15 What is the balanced chemical equation for the reaction between calcium and water? a + 2 O ao + 2 a + 2 O a(o) 2 + 2 a + 2 2 O ao + 2 a + 2 2 O a(o) 2 + 2 5
16 The equation shows the reaction between magnesium and sulfuric acid. Mg + 2 SO 4 MgSO 4 + 2 (Mg = 24, = 1, S = 32, O = 16) In this reaction, what mass of magnesium sulfate will be formed when 6 g of magnesium reacts with excess sulfuric acid? 8 24 30 60 17 Iron forms an oxide with the formula Fe 2 O 3. What is the relative formula mass of this compound? 76 100 136 160 18 The structure of an organic compound, X, is shown. What is the molecular formula of X? 6 9 6 12 7 12 7 14 19 What is the relative molecular mass, M r, of nitrogen dioxide? 15 23 30 46 6
20 In athletics, banned drugs such as nandrolone have been taken illegally to improve performance. Nandrolone has the molecular formula 18 26 O 2. What is the relative molecular mass, M r, of nandrolone? (Relative atomic mass: = 1; = 12; O = 16) 46 150 274 306 21 compound contains one atom of calcium, two atoms of hydrogen and two atoms of oxygen. What is the correct chemical formula of the compound? ao 2 2 OaO 2 ao 2 a(o) 2 22 Two atoms of magnesium, Mg, react with one molecule of oxygen, O 2. What is the formula of the product? MgO MgO 2 Mg 2 O Mg 2 O 2 23 opper(ii) oxide reacts with ammonia. The left hand side of the balanced equation for this reaction is: 3uO + 2N 3 What completes the equation? 3u + 2NO 3 3u + 2N + 3 2 O 3u + N 2 + 3 2 O 3u + 2NO + 3 2 O 7
24 What is the relative formula mass, M r, of ao 3? 50 68 100 204 25 molecule, Z, contains two atoms of oxygen, six atoms of hydrogen and three atoms of carbon. What is the formula of Z? 3 2 O 3 O 3 2 5 O 2 3 6 O 2 26 luminium oxide has the formula l 2O 3. Which statement about aluminium oxide is correct? 2 g of aluminium atoms are combined with 3 g of oxygen atoms. 2 g of aluminium atoms are combined with 3 g of oxygen molecules. luminium oxide has a relative molecular mass of 102. Pure aluminium oxide contains a higher mass of oxygen than of aluminium. 27 The equation shows the reaction between magnesium and sulfuric acid. [ r :, 1; O, 16; Mg, 24; S, 32] Mg + 2 SO 4 MgSO 4 + 2 In this reaction, which mass of magnesium sulfate is formed when 6 g of magnesium react with excess sulfuric acid? 8 24 30 60 8
28 The compound magnesium nitrate has the formula Mg(NO 3 ) 2. What is the relative formula mass of magnesium nitrate? 86 134 148 172 29 Which quantities of chemicals will react exactly with no reactants left over? 12 g of carbon and 12 g of oxygen 12 g of carbon and 48 g of oxygen 12 g of magnesium and 16 g of oxygen 24 g of magnesium and 16 g of oxygen 9