Chapter 05 - Chemical Reactions
Chapter 05 Chemical Reactions
Multiple Choice Questions 1. The law of conservation of mass states that A. atoms cannot be created or destroyed in a chemical reaction. B. molecules cannot be created or destroyed in a chemical reaction. C. compounds cannot be created or destroyed in a chemical reaction. D. heat cannot be created or destroyed in a chemical reaction.
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
2. The Greek letter delta () may be written over the reaction arrow in a chemical equation to indicate that
A. heat is generated when the reaction occurs. B. a catalyst is needed for the reaction to occur. C. water is needed for the reaction to occur. D. heat is needed for the reaction to occur. Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
3. Which chemical equation is properly balanced? A. SO2 + O2 + H2O H2SO4
B. 2 SO2 + O2 + 2 H2O 2 H2SO4
C. SO2 + O2 + 4 H2O 2 H2SO4
D. 4 SO2 + O2 + 4 H2O 4 H2SO4
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
4. In the chemical equation 2 Co(NO3)3 + 3 (NH4)2S Co2S3 + 6 NH4NO3 , how many nitrogen atoms are on each side of the equation?
A. 2 B. 3 C. 6 D. 12 E. 16 Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
5. Write a balanced chemical equation for the reaction of acetone (C3H6O) with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). A. C3H6O + O2 CO2 + H2O
B. C3H6O + 4 O2 3 CO2 + 3 H2O
C. 3 CO2 + 3 H2O C3H6O + 4 O2
D. 6 C3H6O + 8 O2 6 CO2 + 6 H2O
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
6. How many carbon atoms are in 3.85 mol of carbon? A. 3.85 carbon atoms B. 23.2 carbon atoms C. 6.02 1023 carbon atoms D. 2.32 1024 carbon atoms E. 6.40 10–24 carbon atoms
Bloom's Level: 5. Evaluate Difficulty: Easy Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
7. How many iron atoms are in 0.32 mol of Fe2O3? A. 3.9 1023 iron atoms B. 3.9 iron atoms C. 6.02 1023 iron atoms D. 1.9 1023 iron atoms E. 1.1 10–24 iron atoms
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
8. How many moles of chloroethylene (C2H3Cl) contain 5.47 1026 molecules? A. 3.29 1050 mol of C2H3Cl B. 5.47 1026 mol of C2H3Cl C. 909 mol of C2H3Cl D. 5450 mol of C2H3Cl
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
9. What is the formula weight of KCl? A. 74.55 amu B. 66.42 amu C. 36.00 amu D. 1386 amu
Bloom's Level: 5. Evaluate Difficulty: Easy Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
10. What is the formula weight of Co(NO3)3? A. 88.94 amu B. 244.96 amu C. 216.94 amu D. 148.96 amu E. 196.96 amu
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
11. What is the mass of 3.81 mol of PH3? A. 34.0 g B. 3.81 g C. 8.92 g D. 130. g E. 0.112 g
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Mole Conversions Topic: Chemical Calculations
12. How many moles of carbon dioxide are in 211 g of carbon dioxide? A. 929 mol of CO2 B. 4.79 mol of CO2 C. 167 mol of CO2 D. 0.209 mol of CO2
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Mole Conversions Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
13. Aspartic acid is an amino acid used to synthesize proteins. What is the molar mass of aspartic acid shown below?
A. 121.09 g/mol B. 133.11 g/mol C. 117.0 g/mol D. 126.04 g/mol E. 132.09 g/mol Bloom's Level: 5. Evaluate Difficulty: Easy Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
14. Which sample contains the largest number of molecules? A. 100 g of CO2 B. 100 g of CH4 C. 100 g of CBr4 D. 100 g of CHBr3
Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Mole Conversions Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
15. How many moles of sulfur trioxide are formed from 3 moles of sulfur dioxide using the given balanced equation? 2 SO2 + O2 2 SO3
A. 1 mol of SO3 B. 2 mol of SO3 C. 3 mol of SO3 D. 5 mol of SO3 E. 6 mol of SO3 Bloom's Level: 3. Apply Difficulty: Easy Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Mole Conversions Topic: Chemical Calculations
16. How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given balanced equation? 2 SO2 + O2 2 SO3
A. 1 mol of SO3 B. 2 mol of SO3 C. 3 mol of SO3 D. 5 mol of SO3 E. 6 mol of SO3 Bloom's Level: 3. Apply Difficulty: Medium Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Mole Conversions Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
17. Consider the reaction: 2 Al(OH)3 + 3 H2SO4 Al2(SO4)3 + 6 H2O. How many grams of Al2(SO4)3 are generated when 152 g of H2SO4 reacts?
A. 530. g of Al2(SO4)3 B. 1590 g of Al2(SO4)3 C. 177 g of Al2(SO4)3 D. 43.6 g of Al2(SO4)3 E. 131 g of Al2(SO4)3 Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations
18. A balanced chemical equation tells the number of _____ of each reactant that combine and the number of _____ of each product formed. A. grams, grams B. grams, moles C. moles, grams D. moles, moles
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
19. Suppose the theoretical yield in a reaction is 10.5 g and the percent yield is 75.5%. What is the actual yield of product obtained? A. 793 g B. 7.93 g C. 13.9 g D. 0.139 g
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
20. Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 2 Na2O. What is the theoretical yield of Na2O in grams from 9.0 mol of O2?
A. 11 g of Na2O B. 410 g of Na2O C. 1,100 g of Na2O D. 280 g of Na2O E. 560 g of Na2O Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Limiting Reactant Subtopic: Reaction Yield Topic: Chemical Calculations
21. Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na + O2 2 Na2O. If 2.55 mol of sodium reacts, and 75.0 g of Na2O is produced, what is the percent yield?
A. 94.9% yield B. 34.0% yield C. 47.5% yield D. 190.% yield Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Limiting Reactant Subtopic: Reaction Yield Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
22. If a synthesis has four steps and each step has a 75% yield (0.75 written as a decimal), what is the overall percent yield? A. 75% B. 19% C. 56% D. 32% E. 42%
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
23. Potassium metal (K) reacts violently when added to water according to the balanced equation: 2 K(s) + 2 H2O(l) 2 KOH(aq) + H2(g). How many moles of H2O are needed to react completely with 7.54 mol of K?
A. 2 mol of H2O B. 7.54 mol of H2O C. 15.1 mol of H2O D. 3.77 mol of H2O Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
24. Tin (II) fluoride can be made by the following reaction: Sn(s) + 2 HF(g) SnF2(s) + H2(g). What is the maximum amount of SnF2 that can be produced when 0.480 moles of Sn are mixed with 0.720 moles of HF?
A. 0.360 moles of SnF2 B. 0.480 moles of SnF2 C. 0.600 moles of SnF2 D. 0.720 moles of SnF2 E. 1.20 moles of SnF2 Bloom's Level: 2. Understand Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations
25. Identify the species that is oxidized and the species that is reduced in the reaction: 2 I– + Cl2 2 Cl– + I2
A. I– is oxidized and Cl2 is reduced. B. Cl2 is oxidized and I– is reduced. C. I2 is oxidized and Cl–is reduced. D. Cl2 is oxidized and Cl– is reduced. E. I2 is oxidized and I– is reduced. Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
26. What are the two half reactions that show how many electrons are gained or lost by each species in the reaction: Ni2+(aq) + Mg(s) Ni(s) + Mg2+(aq)?
A. Ni2+(aq) + e– Ni(s) and Mg(s) Mg2+(aq) + e–
B. Ni2+(aq) + 2 e– Ni(s) and Mg(s) Mg2+(aq) + 2 e–
C. Ni2+(aq) Ni(s) + 2 e– and Mg(s) + 2 e– Mg2+(aq)
D. Ni2+(aq) Ni(s) + e– and Mg(s) + e– Mg2+(aq)
E. Ni2+(aq) + 2 e– Ni(s) and Mg(s) + 2 e– Mg2+(aq)
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
27. Which quantity has the greatest mass? A. 2.0 mol of Na B. 2.0 mol of Na2O C. 2.0 mol of NaCl D. 2.0 mol of O2 E. All of these quantities have the same mass.
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Molar Mass Subtopic: Mole Conversions Topic: Chemical Calculations
28. How many moles of sodium chloride (table salt, NaCl, molar mass 58.44 g/mol) are contained in a 1.00 lb box of table salt? A. 26,500 mol of NaCl B. 4.68 1024 mol of NaCl C. 58.44 mol NaCl D. 7.77 mol of NaCl E. 0.129 mol of NaCl
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Molar Mass Subtopic: Mole Conversions Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
29. Consider the mixture of Cl2 and F2 in a closed container as illustrated below. What will the contents of the container look like if the molecules undergo the reaction: Cl2(g) + 3 F2(g) 2 ClF3(g)?
A.
B.
C.
D.
Bloom's Level: 3. Apply Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
30. In the balanced redox reaction: 2 Cu(s) + S(s) Cu2S(s), how many electrons are gained or lost by each copper atom?
A. each copper atom gains two (2) electrons B. each copper atom gains one (1) electron C. each copper atom loses one (1) electron D. each copper atom loses two (2) electrons Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
31. In the balanced redox reaction: 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g), which species is oxidized?
A. C2H6(g) B. O2(g) C. CO2(g) D. H2O(g) Bloom's Level: 3. Apply Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
32. In the balanced redox reaction: 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g), which species is reduced?
A. C2H6(g) B. O2(g) C. CO2(g) D. H2O(g) Bloom's Level: 3. Apply Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
33. How many grams of oxygen gas are required to completely react with 77.28 g of ethane (C 2H6) in the balanced redox reaction: 2 C2H6(g) + 7 O2(g) 4 CO2(g) + 6 H2O(g)?
A. 77.28 g of O2(g) B. 23.50 g of O2(g) C. 143.9 g of O2(g) D. 8.995 g of O2(g) E. 287.8 g of O2(g) Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
34. How many carbon atoms are in 77.28 g of ethane (C2H6)? A. 2.570 carbon atoms B. 5.140 carbon atoms C. 3.094 1024 carbon atoms D. 1.548 1024 carbon atoms E. 1.238 1025 carbon atoms
Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations
35. What is the molar mass of the compound show below?
A. 90.13 amu B. 90.13 g/mol C. 93.13 amu D. 93.13 g/mol E. 91.14 g/mol Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
36. What is the mass of 3.4 1020 molecules of ethanol (C2H6O) expressed in milligrams? A. 0.026 mg of ethanol B. 26,000 mg of ethanol C. 0.012 mg of ethanol D. 26 mg of ethanol
Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Molar Mass Subtopic: Mole Conversions Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
37. The chemical equation: KClO3(s) KCl(s) + O2(g) is not balanced. Balance this equation, then select the statement that best describes the balanced equation.
A. The balanced equation will have six atoms of oxygen on each side of the equation. B. The balanced equation will have one atom of chlorine on each side of the equation. C. The balanced equation will have an O3 on the product side of the equation. D. The balanced equation will have a coefficient of 1 in front of KCl. Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
38. Sodium fluoride can be produced from the reaction between sodium metal and fluorine gas. Which of the following represents the balanced chemical equation for this reaction? A. 2 Na(s) + F2(g) 2 NaF(s)
B. Na+(s) + F–(g) NaF(s)
C. Na(s) + F2(g) NaF2(s)
D. 2 Na(s) + F2(g) Na2F2(s)
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
39. The conversion factor shown below was obtained from the balanced chemical equation: 4 KO 2(s) + 2 CO2(g) 2 K2CO3(s) + 3 O2(g). This conversion factor would be used to calculate which of the following?
A. the amount of KO2 required to react with a certain amount of O2 B. the amount of O2 that can react with a certain amount of KO2 C. the amount of O2 that can be produced from a certain amount of KO2 D. the amount of KO2 that is required to produce a certain amount of O2 Bloom's Level: 3. Apply Difficulty: Medium Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Mole Conversions Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
40. Blimps are essentially very large helium filled balloons. If a blimp contains 536 kg of helium, how many helium atoms are present inside the blimp? A. 134,000 He atoms B. 8.9 x 10-19 He atoms C. 8.06 x 1028 He atoms D. 3.23 x 1026 He atoms
Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
41. Beaker A contains 1 mole of iron atoms, and Beaker B contains 1 mole of lead atoms. Which statement concerning these two samples is known with certainty?
A. Beakers A and B contain samples with the same molar mass. B. Beakers A and B contain an equal number of atoms. C. Beakers A and B contain an equal volume of atoms. D. Beakers A and B contain equal masses of atoms. Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
42. Assume that the mixture of substances in Figure 1 undergoes a chemical reaction. Which diagram represents a product mixture that is consistent with the Law of Conservation of Mass?
A.
B.
C.
D. It is impossible to predict based on the information given. Bloom's Level: 3. Apply Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
43. A student runs the reaction: LiOH + CO2 LiHCO3. The reaction consumes 45.0 g LiOH and produces 72.8 g of LiHCO 3. Which of the statements concerning this reaction is true?
A. The actual yield of the product is 72.8 g LiHCO3. B. The theoretical yield of the product is 72.8 g LiHCO3. C. The theoretical yield of the product is 117.8 g LiHCO3. D. The percent yield of the reaction is 61.8%. Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Reaction Yield Subtopic: Types of Chemical Reactions Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
True / False Questions 44. The subscripts in chemical formulas are changed in order to balance a chemical equation. FALSE
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
45. A chemical equation is balanced by adding coefficients in front of some formulas so that the number of atoms of each element is equal on both sides of the equation. TRUE
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
46. A mole of copper atoms has more atoms than a mole of lead atoms. FALSE
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
47. One mole of oxygen molecules contains more atoms than one mole of lead atoms. TRUE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
48. The molar mass of CaCO3 is greater than the molar mass of Ca(NO3)2. FALSE
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
49. The actual yield is the amount of product expected from a given amount of reactant based on the coefficients in the balanced chemical equation. FALSE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
50. In calculating the percent yield, both the actual yield and theoretical yield must be in units of grams. FALSE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
51. Oxidation is the gain of electrons by an atom. FALSE
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
52. All chemical reactions convert one substance into another. TRUE
Bloom's Level: 1. Remember Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
53. In the reaction: Ni2+(aq) + Mg(s) Ni(s) + Mg2+(aq), the oxidizing agent is Ni2+(aq).
TRUE Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
54. In the reaction: Ni2+(aq) + Mg(s) Ni(s) + Mg2+(aq), the species that undergoes reduction is Mg(s).
FALSE Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
55. Combustion reactions are redox reactions. TRUE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
56. The balanced reaction: 4 NO2 + O2 + 2 H2O 4 HNO3 states that four moles of nitrogen dioxide react with each mole of oxygen.
TRUE Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
57. The balanced reaction: 4 NO2 + O2 + 2 H2O 4 HNO3 states that four grams of nitrogen dioxide reacts with each gram of oxygen.
FALSE Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
58. The balanced reaction: 4 Fe(s) + 3 O2(g) 2 Fe2O3(s) is an oxidation-reduction reaction.
TRUE Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
59. A mole is a quantity that contains 6.02 10–23 atoms, molecules, or ions. FALSE
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
60. The formula weight of a compound is the sum of the atomic weights of all the atoms in a compound, reported in atomic mass units. TRUE
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
61. When the mass of a substance produced in a reaction must be calculated, first its number of moles is determined using mole ratios, and then Avogadro's number is used to convert moles to grams. FALSE
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Molar Mass Subtopic: Mole Conversions Topic: Chemical Calculations
62. The actual yield of a product in a chemical reaction should not exceed its theoretical yield. TRUE
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
63. In redox reactions, metals tend to undergo oxidation. TRUE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
64. The electric current generated in batteries used for portable electronic devices and pacemakers results from redox reactions. TRUE
Bloom's Level: 3. Apply Difficulty: Easy Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
65. The reaction: Mg(s) + 2 HBr(aq) MgBr2(s) + H2(g) is an oxidation-reduction reaction.
TRUE Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
66. Consider the balanced reaction: 4 NO2 + O2 + 2 H2O 4 HNO3. If 100. g of NO2 is placed in a reaction vessel the theoretical yield of nitric acid (HNO3) collected will be 137 g.
TRUE Bloom's Level: 5. Evaluate Difficulty: Hard Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
67. In a chemical reaction, the actual yield of a product may be reduced by side reactions. TRUE
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
68. 2 Co(NO3)3(aq) + 3 (NH4)2S(aq) Co2S3(s) + 3 NH4NO3(aq) is a properly balanced chemical equation.
FALSE Bloom's Level: 4. Analyze Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
69. To determine the overall percent yield in a synthesis that has more than one step, subtract the percent yield for each step from 100% yield. FALSE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
70. Consider the balanced reaction: 2 A + B C, where the molar mass of B is less than the molar mass of A. It requires a smaller mass of A to completely react with given mass of B.
FALSE Bloom's Level: 4. Analyze Difficulty: Hard Gradable: automatic Subtopic: Limiting Reactant Subtopic: Molar Mass Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
71. In the reaction: Ni2+(aq) + Mg(s) Ni(s) + Mg2+(aq), two electrons are transferred from Ni2 to Mg.
FALSE Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
72. A 100-g sample of the compound below contains greater than one mole of molecules.
TRUE Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Molar Mass Subtopic: Mole Conversions Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
73. A 100-g sample of the compound below contains less than 6.02 1023 molecules.
FALSE Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Molar Mass Subtopic: Mole Conversions Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
74. One term in a balanced chemical equation contains the coefficient 4 in front of the formula Mg3(PO4)2. This term represents that there are 12 Mg atoms, 4 P atoms and 16 O atoms in this term. FALSE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
75. To multiply two numbers in scientific notation, multiply the coefficients together and multiply the exponents in the powers of 10. FALSE
Bloom's Level: 1. Remember Difficulty: Medium Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Topic: Chemical Calculations
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Chapter 05 - Chemical Reactions
76. The molar mass of dibromomethane (CH2Br2) is larger than the molar mass of dichloromethane (CH2Cl2). TRUE
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Molar Mass Topic: Chemical Calculations
77. A 200.-mg ibuprofen (C13H18O2) tablet contains greater than one mole of ibuprofen molecules. FALSE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Molar Mass Subtopic: Mole Conversions Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
78. Consider the unbalanced chemical equation: NH3 + O2 NO + H2O. It requires 55.4 g of NH3 to completely react with 156 g of O2.
FALSE Bloom's Level: 4. Analyze Difficulty: Hard Gradable: automatic Subtopic: Calculating Amounts of Reactant and Product Subtopic: Mole Conversions Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
79. The mass of one ethanol (C2H6O) molecule is 7.65 10–23 grams. TRUE
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: The Mole (Definition and Avogadro's Number) Topic: Chemical Calculations
80. A chemical change alters the chemical composition of a substance, and therefore a new substance is produced. TRUE
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
Fill in the Blank Questions 81. A chemical equation is an expression that uses chemical formulas and other symbols to illustrate what _____ constitute the starting materials in a reaction and what _____ are formed. reactants, products
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
82. A redox reaction involves the transfer of _____ from one element to another. electrons
Bloom's Level: 1. Remember Difficulty: Easy Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
83. A compound that gains electrons in a redox reaction while causing another compound to be oxidized is called a(n) _____ agent. oxidizing
Bloom's Level: 2. Understand Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
84. _____ results in the loss of oxygen atoms or the gain of hydrogen atoms. Reduction
Bloom's Level: 1. Remember Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
85. In a redox reaction, the _____ agent is the substance that gets oxidized. reducing
Bloom's Level: 1. Remember Difficulty: Medium Gradable: automatic Subtopic: Types of Chemical Reactions Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
86. In a two-step synthesis where the first reaction has a 55% yield and the second reaction has a 24% yield, the overall percent yield of the reaction is _____% yield. 13
Bloom's Level: 5. Evaluate Difficulty: Medium Gradable: automatic Subtopic: Reaction Yield Topic: Chemical Calculations
87. In the balanced reaction: 2 I– + Cl2 2 Cl– + I2, _____ is the reducing agent and _____ is the oxidizing agent.
I–, Cl2 Bloom's Level: 4. Analyze Difficulty: Medium Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
88. Aluminum metal and oxygen gas are obtained when aluminum oxide is heated at high temperature. The reactant(s) in this chemical reaction is(are) _____. aluminum oxide
Bloom's Level: 2. Understand Difficulty: Easy Gradable: automatic Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Reactions
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Chapter 05 - Chemical Reactions
89. The combustion of hexane (C6H14), a component of gasoline, is represented by the balanced chemical equation: 2 C 6H14(l) + 19 O2(g) 12 CO2(g) + 14 H2O(g). If 1.0 mole of hexane undergoes combustion, _____ moles of O 2 are required.
9.5 Bloom's Level: 4. Analyze Difficulty: Medium Gradable: automatic Subtopic: Mole Conversions Subtopic: Writing and Balancing Chemical Equations Topic: Chemical Calculations Topic: Chemical Reactions
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