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SECTION A – Multiple-choice questionsInstructions for Section AAnswer all questions. Choose the response that is correct or best answers the question. A correct answer scores 1, an incorrect answer scores 0. No mark will be given if more than one answer is completed for any question. Marks will not be deducted for incorrect answers. Question 1Lithium metal can react with water to form lithium hydroxide and water. _ Li(s) + _H2O(l) _LiOH(aq) + _H2(g)The coefficients in this equation are, respectivelyA. 1, 1, 1, 1B. 2, 1, 2, 1C. 2, 2, 2, 1D. 2, 1, 2, 2Question 224 g of carbon reacts exactly with 8 g of hydrogen. The hydrocarbon compound formed isA. CH3B. CH4C. C2H6D. C2H4Question 3Which of the following represents the greatest mass of calcium nitrate, Ca(NO3)2?A. 1 molB. 200 mL of 2.0 M Ca(NO3)2C. 100 gD. 500 mL of 1.5 M Ca(NO3)2Question 4How many mol of oxygen gas can be isolated from 0.86 mol of yellowcake, U3O8?A. 0.50B. 0.86C. 2.58D. 3.44Use the following information to answer Questions 5 and 6The reaction between aluminium and oxygen is4Al(s) + 3O2(g) 2Al2O3(s)Question 5The number of mol of oxygen gas required to react exactly with 1.44 mol of aluminium will beA. 1.08B. 1.44C. 1.92D. 4.32Question 6The number of mol of aluminium metal required to react exactly with 1.44 mol of oxygen gas will beA. 1.08B. 1.44C. 1.92D. 4.32Use the following information to answer Questions 7 and 8Sodium metal can react with chlorine gas to form NaCl. 2Na(s) + Cl2(g) 2NaCl(s)Question 7If 4.68 mol of sodium reacts with 2.20 mol of chlorine gasA. 2.20 mol of sodium chloride formsB. 4.40 mol of sodium chloride formsC. 4.68 mol of sodium chloride formsD. 6.88 mol of sodium chloride formsQuestion 8A reaction between sodium and chlorine produces 6.6 mol of sodium chloride. The total number of mole of reactant required for this reaction was, in mol,A. 3.3B. 6.6C. 9.9D. 13.2Use the following information to answer Questions 9 and 10The reaction between sodium chloride and silver nitrate solutions produces a precipitate of silver chloride;AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq)Question 9The number of mol of precipitate that could be formed from 50 mL of 0.80 M NaCl solution will beA. 1.6B. 0.8C. 0.08D. 0.04Question 10When 20 mL of 0.24 M of sodium chloride is added to 30 mL of 0.15 M silver nitrate. The number of mol of precipitate formed will beA. 0.0040B. 0.0045C. 0.24D. 0.39SECTION B- Short-answer questionsInstructions for Section BQuestions must be answered in the spaces provided in this book. To obtain full marks for your responses you should Give simplified answers with an appropriate number of significant figures to all numerical questions; unsimplified answers will not be given full marks. Show all workings in your answers to numerical questions. No credit will be given for an incorrect answer unless it is accompanied by details of the working. Make sure chemical equations are balanced and that the formulas for individual substances include an indication of state; for example, H2(g); NaCl(s) Question 1The reaction between ammonia and oxygen is4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)a. If a reaction occurs that uses 0.60 mol of ammonia, determine the amount of the other reactant required and the amounts of product formed; ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________1 + 1 + 1 = 3 marksb. A second reaction consumes 4.40 mol of oxygen gas. Determine the amount of the other reactant required and the amounts of product formed; ______________________________________________________________________ ______________________________________________________________________ ______________________________________________________________________1 + 1 + 1 = 3 marksc. If 0.68 mol of ammonia is reacted with 0.80 mol of oxygen, determine i. which reagent is the limiting reagent. _____________________________________________________________________ ____________________________________________________________________ ii. the number of mol of nitrogen monoxide formed. ____________________________________________________________________ iii. the mass of nitrogen monoxide formed. _____________________________________________________________________2 + 1 + 1 = 4 marksTotal 10 marksQuestion 2Calcium carbonate, CaCO3 decomposes when heated to form calcium oxide and carbon dioxide gas.a. Write a balanced equation for this reaction. __________________________________________________________________________1 markb. i. Determine the mass change occurring in a beaker if 2.20 g of CaCO3 is heated to constant mass. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ ii. What does the term ‘to constant mass’ mean? __________________________________________________________________________3 + 1 = 4 marksTotal 5 marksQuestion 3When phosphorous reacts with oxygen the reaction is P4(s) + 5O2(g) P4O10(s)If 40 g of phosphorous reacts with 150 g of oxygen gas, what mass of product is formed?________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________4 marksQuestion 4When sodium sulfate solution is mixed with barium nitrate a precipitate forms;Na2SO4(aq) + Ba(NO3)2(aq) BaSO4(s) + 2NaNO3(aq)a. Determine the mass of precipitate that can formed from 250 mL of 0.40 M sodium sulfate. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________3 marksb. If a precipitate of mass 0.784 g is formed, what mass of sodium sulfate must have been present? ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________3 marksTotal 6 marksQuestion 5Aluminium chloride solution can be used to control excessive sweating. A 50 g sample is tested for its aluminium chloride concentration by precipitation of silver chloride.The reaction between aluminium chloride and silver nitrate is AlCl3(aq) + 3AgNO3(aq) Al(NO3)3(aq) + 3AgCl(s)a. The mass of precipitate from the 50 g sample is found to be 2.94 g. i. Determine the mass of aluminium chloride in the sample. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________3 marks ii. What was the (%m/m) concentration of aluminium chloride in the sample? _______________________________________________________________________1 markb. Silver chloride particles are very small and some can pass through low grade filter paper. Explain the impact on your calculations in part a. of a loss of some of the precipitate. ________________________________________________________________________ ________________________________________________________________________2 marksTotal 6 marksQuestion 6a. Sulfur burns readily in oxygen to form sulfur dioxide gas, SO2. i. Write a balanced equation for this reaction. _______________________________ ii. What mass of sulfur is required to form 100 g of SO2? _______________________________________________________________________ ________________________________________________________________________ _________________________________________________________________________ iii. What mass of oxygen was required? _________________________________________________________________________ iv. The SO2 gas can then be converted to SO3 gas. Determine the mass of SO3 that can be formed from the 100 g of SO2. ________________________________________________________________________ _________________________________________________________________________1 + 3 + 1 + 2 = 7 marksb. 100 g of sulfur reacts with 100 g of oxygen gas. Which chemical is the excess reagent? _______________________________________________________________________ _______________________________________________________________________2 marksTotal 9 marksEND OF KEY TOPIC TEST ................
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