Stoichiometry. Question Paper 2. Chemistry (0620/0971) Cambridge International Examinations (CIE) Topic. Stoichiometry. Stoichiometry.

Transcription

1 For more awesome resources, visit us at Stoichiometry Question Paper 2 Level IGSE Subject hemistry (0620/0971) Exam Board ambridge International Examinations (IE) Topic Stoichiometry Sub-Topic Stoichiometry Booklet Question Paper 2 27 minutes Time Allowed: Score: /22 Percentage: /100 Grade Boundaries: >85% 75% 68% 60% 53% 48% % 33% <25%

2 1 What is the relative molecular mass, M r, of butanol? A 15 B D The equation shows the thermal decomposition of magnesium carbonate (M r = 84). MgO 3 MgO + O 2 Which mass of magnesium oxide is formed when 21.0 g of magnesium carbonate are completely decomposed? A 1.9 g B 4.0 g 10.0 g D 40.0 g 3 A compound with the formula XO 2 has a relative formula mass of 64. What is X? A B D cadmium copper gadolinium sulfur 2

3 4 The equation for the reaction between barium chloride solution and dilute sulfuric acid is shown. Bal 2 + H 2 SO 4 BaSO 4 + 2Hl Which row shows the state symbols for this equation? 5 A compound is analysed and found to contain 85.7% carbon and 14.3% hydrogen. What is its empirical formula? A H B H 2 2 H 4 D 6 H 6 The equation for the reaction between phosphorus and oxygen is shown. xp 4 + yo 2 zp 2 O 5 Which values of x, y and z balance the equation? 3

4 7 The relative molecular mass of an alcohol is 88. Its percentage composition by mass is:, 54.5%; H, 9.1%; O, 36.4%. Which row shows the empirical formula and molecular formula for this alcohol? 8 The equation represents the reaction between solid magnesium oxide and dilute hydrochloric acid to form magnesium chloride and water. MgO + 2Hl Mgl 2 + H 2 O Which row shows the state symbols for hydrochloric acid, magnesium chloride and water? 9 A compound contains 34.5% calcium, 24.1% silicon and 41.4% oxygen by mass. What is its empirical formula? A a 2 SiO 3 B asio 3 asi 2 O 3 D asio 6 4

5 10 What is the relative formula mass of ammonium nitrate, NH 4 NO 3? A 80 B D When chlorine reacts with hot concentrated aqueous sodium hydroxide one of the products formed is sodium chlorate(v). The formula of sodium chlorate(v) is Nal O 3. What is the relative formula mass of sodium chlorate(v), Nal O 3? A 52.0 B D What is the relative formula mass of aluminium oxide, Al 2O 3? A 43 B D Aluminium reacts with fluorine. xal (s) + y F 2 (g) zal F 3 (s) Which values of x, y and z balance the equation? x y z A B D arbon monoxide burns in oxygen to produce carbon dioxide. 2O(g) + O 2 (g) 2O 2 (g) Which mass of carbon dioxide is produced from 14 g of carbon monoxide? A 22 g B 28 g 44 g D 88 g 5

6 15 Which equations are balanced? 1 Fe 2 O 3 + 3O 2Fe + 3O 2 2 ZnO 3 + 2Hl Znl 2 + O 2 + 2H 2 O 3 Mg(NO 3 ) 2 + NaOH Mg(OH) 2 + 2NaNO 3 4 ao 3 + H 2 SO 4 aso 4 + H 2 O + O 2 A 1 and 2 B 1 and 4 2 and 3 D 3 and 4 16 alcium carbide, a 2, reacts with water to form ethyne, 2 H 2, and calcium hydroxide. The equation for the reaction is shown. a 2 (s) + 2H 2 O(l) 2 H 2 (g) + a(oh) 2 (s) Which volume of ethyne is produced when 6 g of water react completely with calcium carbide? A 4 dm 3 B 8 dm 3 36 dm 3 D 72 dm 3 17 Aqueous iron(iii) sulfate and aqueous sodium hydroxide react to give a precipitate of iron(iii) hydroxide and a solution of sodium sulfate. What is the balanced equation for this reaction? A B D Fe 2 (SO 4 ) 3 (aq) + 2NaOH(aq) Fe(OH) 3 (s) + Na 2 SO 4 (aq) Fe 2 (SO 4 ) 3 (aq) + 3NaOH(aq) Fe(OH) 3 (s) + 3Na 2 SO 4 (aq) Fe 2 (SO 4 ) 3 (aq) + 6NaOH(aq) 2Fe(OH) 3 (s) + 3Na 2 SO 4 (aq) 2Fe 2 (SO 4 ) 3 (aq) + 6NaOH(aq) 4Fe(OH) 3 (s) + 6Na 2 SO 4 (aq) 18 The equation for the reaction between sodium carbonate and dilute hydrochloric acid is shown. Na 2 O 3 + 2Hl 2Nal + H 2 O + O 2 What is the maximum volume of carbon dioxide produced when 26.5 g of sodium carbonate react with dilute hydrochloric acid? A 6 dm 3 B 12 dm 3 18 dm 3 D 24 dm 3 6

7 19 affeine is a stimulant found in coffee. O H 3 H 3 O N N N N H H 3 caffeine Which formula represents caffeine? A 7 H 10 N 4 O 2 B 8 H 10 N 3 O 2 8 H 10 N 4 O 2 D 8 H 11 N 4 O 2 20 The formulae of some ions are shown. positive ions negative ions In which row is the formula not correct? Al 3+ Br a 2+ O 3 2 u 2+ NO Fe S K + SO 4 2 compound formula A aluminium sulfate Al 2(SO 4 ) 3 B calcium nitrate a(no 3 ) 2 iron(iii) bromide Fe 3 Br D potassium sulfide K 2 S 7

8 21 The gas hydrazine has the molecular formula N 2 H 4. Hydrazine burns in air to form nitrogen gas and steam. N 2 H 4 (g) + O 2 (g) N 2 (g) + 2H 2 O(g) Which statements are correct? mole of hydrazine gives 72 dm 3 of gaseous products when it reacts with oxygen at room temperature and pressure. The empirical formula of hydrazine is NH 2. The total number of atoms in 1 mole of hydrazine is 6 the Avogadro constant. The volume of 1 mole of hydrazine at room temperature and pressure is 6 24 dm 3. A 1, 2 and 3 B 1 and 2 only 2, 3 and 4 D 3 and 4 only 22 opper(ii) carbonate is broken down by heating to form copper(ii) oxide and carbon dioxide gas. The equation for the reaction is shown. uo 3 uo + O g of copper(ii) carbonate are heated until all of the contents of the test-tube have turned from green to black. The yield of copper(ii) oxide formed is 17.5 g. What is the percentage yield? A 19.02% B 21.88% 56.50% D 87.50% 8