AP Chemistry Test (Chapter 3) Multiple Choice and FIB (45%) 1) Which of these lab errors would cause a low % yield O 2?

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Dwight Scott
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1 AP Chemistry Test (Chapter 3) (Autumn) Multiple Choice and FIB (45%) 1) Which of these lab errors would cause a low % yield 2? 2 KCl 3 (s) 2 KCl (s) (g) I) Using a crucible that has soot stuck to it II) Using a low mass of KCl 3 III) eating the crucible an insufficient length of time IV) Spilling some of the KCl A) I and III B) III and IV C) II and IV D) III 2) What coefficients balance this reaction? Fe 3 P 4 + K 2 S 4 Fe(S 4 ) 2 + K 3 P A) 1, 1, 3, 4 B) 1, 6, 3, 4 C) 3, 2, 3, 2 D) 2, 3, 3, 2 3) What is the name of N 4 Br 4 4 2? 4) Which one is an empirical formula? A) C B) P 4 10 C) C D) N 2 6 E) C Please use the following information to answer questions mol A 4 reacts with 4.22 mol B 7 in this reaction in a sealed flask: 35 A B 7 28 A 5 B 3 5) Which one is the limiting reagent? 6) ow many mol A 5 B 3 are produced? 7) ow many mol of the excess reagent are consumed during the reaction? 8) ow many total mol are in the flask at the end of the reaction?

2 9) Please consider these two samples. Sample #1 is a mixture of iron and sulfur in a mole ratio of 1:1. Sample #2 is FeS. Please choose all true statements about these samples. I) Both samples are chemically combined. II) Sample #1 would show magnetic properties and sample #2 would not. III) Sample #1 would smell differently than sample #2. IV) Both samples would have similar physical and chemical properties. V) Sample #1 is composed of atoms while sample #2 is composed of molecules. A) I, II, III, IV, V B) II, III, IV, V C) II, III, V D) II, III 10) 29.0 g NaCl is dissolved in 60.0 g 2. What is the % NaCl in the solution by mass? 11) What is the formula for chromium (III) sulfite heptahydrate? Please consider this container to answer questions ydrogen reacts with oxygen to form 2. Reactants 12) ow many molecules of limiting reagent are consumed in this reaction? 13) ow many molecules of water are produced? 14) ow many molecules are in the flask at the end of the reaction? 15) Which one is the smallest quantity? A) 1 X Tm B) 1 X 10 6 Mm C) 1 X fm D) 1 X pm E) 1 X 10 9 nm

3 Problems (60%) Please show all your work for any credit. 1) The following lab results were obtained when copper was strongly heated in the presence of excess oxygen. What is the empirical formula of the metallic oxide? Assume the copper did not react with atmospheric N 2. Mass of empty crucible & cover Mass of crucible, cover & copper (before combustion) Mass of crucible, cover & copper (after combustion) g g g 2) A g sample of an organic compound composed entirely of carbon, hydrogen & oxygen was burned to produce g C 2 and g 2. Assume complete combustion The molar mass of the compound is g. What is the molecular formula of this hydrocarbon? 3) A phosphoric acid solution is 2.91% by mass. The density of the phosphoric acid solution is 1.11 g/ml. ow many acetate ions will react with ml of the phosphoric acid solution? 3 Fe (C ) P 4 15 C Fe 3 (P 4 ) 5 4) A reaction mixture contains 7.51 L C 6 14 and 42.1 L 2. What mass of excess reagent remains after the reaction has gone to completion? 2 C C ) A student uses 26.4 g of 11.0% Cl solution to neutralize 12.7 g Al 2 (C 3 ) 3. The student then collects and dries 3.09 g AlCl 3. What is the % yield? 6 Cl + Al 2 (C 3 ) 3 2 AlCl C 2 6) An ore (rock) contains 28.9 % emerald, Be 3 Al 2 (Si 3 ) 6 by mass. What mass of rock would produce 4.11 X atoms of Si?

4 AP Chemistry Test (Chapter 3) (Winter) Multiple Choice and FIB (45%) 1) Which of these lab errors would cause a low % yield 2? 2 KCl 3 (s) 2 KCl (s) (g) I) Using a crucible that has soot stuck to it II) Using a low mass of KCl 3 III) eating the crucible an insufficient length of time IV) Spilling some of the KCl A) II and IV B) III C) I and III D) III and IV 2) What coefficients balance this reaction? Fe 3 P 4 + K 2 S 4 Fe(S 4 ) 2 + K 3 P A) 1, 1, 3, 4 B) 1, 6, 3, 4 C) 3, 2, 3, 2 D) 2, 3, 3, 2 3) What is the name of N 4 Br 6 2? 4) Which one is an empirical formula? A) C B) P 4 10 C) C D) N 2 6 E) C Please use the following information to answer questions mol A 4 reacts with 7.95 mol B 7 in this reaction in a sealed flask: 35 A B 7 28 A 5 B 3 5) Which one is the limiting reagent? 6) ow many mol A 5 B 3 are produced? 7) ow many mol of the excess reagent are consumed during the reaction? 8) ow many total mol are in the flask at the end of the reaction?

5 9) Please consider these two samples. Sample #1 is a mixture of iron and sulfur in a mole ratio of 1:1. Sample #2 is FeS. Please choose all true statements about these samples. I) Both samples are chemically combined. II) Sample #1 would show magnetic properties and sample #2 would not. III) Sample #1 would smell differently than sample #2. IV) Both samples would have similar physical and chemical properties. V) Sample #1 is composed of atoms while sample #2 is composed of molecules. A) II, III, IV, V B) I, II, III, IV, V C) II, III D) II, III, V 10) 19.0 g NaCl is dissolved in 70.0 g 2. What is the % NaCl in the solution by mass? 11) What is the formula for chromium (II) phosphite tetrahydrate? Please consider this container to answer questions ydrogen reacts with oxygen to form 2. Reactants 12) ow many molecules of limiting reagent are consumed in this reaction? 13) ow many molecules of water are produced? 14) ow many molecules are in the flask at the end of the reaction? 15) Which one is the smallest quantity? A) 1 X Tm B) 1 X 10 6 Mm C) 1 X 10 9 nm D) 1 X pm E) 1 X fm

6 Problems (60%) Please show all your work for any credit. 1) The following lab results were obtained when copper was strongly heated in the presence of excess oxygen. What is the empirical formula of the metallic oxide? Assume the copper did not react with atmospheric N 2. Mass of empty crucible & cover Mass of crucible, cover & copper (before combustion) Mass of crucible, cover & copper (after combustion) g g g 2) A g sample of an organic compound composed entirely of carbon, hydrogen & oxygen was burned to produce g C 2 and g 2. Assume complete combustion The molar mass of the compound is g. What is the molecular formula of this hydrocarbon? 3) A phosphoric acid solution is 2.91% by mass. The density of the phosphoric acid solution is 1.11 g/ml. ow many acetate ions will react with ml of the phosphoric acid solution? 3 Fe (C ) P 4 15 C Fe 3 (P 4 ) 5 4) A reaction mixture contains 7.51 L C 6 14 and 42.1 L 2. What mass of excess reagent remains after the reaction has gone to completion? 2 C C ) A student uses 26.4 g of 11.0% Cl solution to neutralize 12.7 g Al 2 (C 3 ) 3. The student then collects and dries 3.09 g AlCl 3. What is the % yield? 6 Cl + Al 2 (C 3 ) 3 2 AlCl C 2 6) An ore (rock) contains 28.9 % emerald, Be 3 Al 2 (Si 3 ) 6 by mass. What mass of rock would produce 4.11 X atoms of Si?

7 AP Chemistry Test (Chapter 3) Name Form Multiple Choice and FIB (45%) 1) 11) 2) 12) 3) 13) 4) 14) 5) 15) 6) 7) 8) 9) 10) Problems (60%) Please show all your work for any credit. 1) Please use only the front side of each piece of paper. 2) Please number your problems clearly and consecutively. 3) Please staple your problems to the back of this page in numerical order. 4) Please write on the paper in the conventional manner. 5) Please do not make a separate list of answers. Record your answer at the end of the work supporting your answer. 6) Please circle/box your answer at the end of the problem.

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