General, Organic, And Biological Chemistry 3rd Edition By janice Smith - Test Bank

General, Organic, And Biological Chemistry 3rd Edition By janice Smith – Test Bank

 

Instant Download – Complete Test Bank With Answers

 

 

Sample Questions Are Posted Below

 

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

The Greek letter delta (D) may be written over the reaction arrow in a chemical equation to indicate that

1. 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

 

 

3. Which chemical equation is properly balanced?
   A.

SO₂ + O₂ + H₂O ® H₂SO₄

2 SO₂ + O₂ + 2 H₂O ® 2 H₂SO₄

SO₂ + O₂ + 4 H₂O ® 2 H₂SO₄

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

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?

1. 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

 

 

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

C₃H₆O + 4 O₂ ® 3 CO₂ + 3 H₂O

3 CO₂ + 3 H₂O ® C₃H₆O + 4 O₂

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

 

 

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

 

 

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

 

 

Aspartic acid is an amino acid used to synthesize proteins. What is the molar mass of aspartic acid shown below?

 

121. 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

 

 

How many moles of sulfur trioxide are formed from 3 moles of sulfur dioxide using the given balanced equation?
2 SO₂ + O₂ ® 2 SO₃

1. 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

How many moles of sulfur trioxide are formed from 3 moles of oxygen using the given balanced equation?
2 SO₂ + O₂ ® 2 SO₃

1. 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

 

 

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?

530. 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

 

 

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?

1. 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

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?

94. 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

 

 

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

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?

7. 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

 

 

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?

1. 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

Identify the species that is oxidized and the species that is reduced in the reaction:
2 I^– + Cl₂ ® 2 Cl^– + I₂

1. 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

 

 

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)?

Ni²⁺(aq) + e^– ® Ni(s) and Mg(s) ® Mg²⁺(aq) + e^–

Ni²⁺(aq) + 2 e^– ® Ni(s) and Mg(s) ® Mg²⁺(aq) + 2 e^–

Ni²⁺(aq) ® Ni(s) + 2 e^– and Mg(s) + 2 e^– ® Mg²⁺(aq)

Ni²⁺(aq) ® Ni(s) + e^– and Mg(s) + e^– ® Mg²⁺(aq)

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

 

 

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

 

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)?

 

 

 

 

 

 

 

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

 

 

In the balanced redox reaction: 2 Cu(s) + S(s) ® Cu₂S(s), how many electrons are gained or lost by each copper atom?

1. 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

In the balanced redox reaction: 2 C₂H₆(g) + 7 O₂(g) ® 4 CO₂(g) + 6 H₂O(g), which species is oxidized?

1. 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

 

 

In the balanced redox reaction: 2 C₂H₆(g) + 7 O₂(g) ® 4 CO₂(g) + 6 H₂O(g), which species is reduced?

1. 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

How many grams of oxygen gas are required to completely react with 77.28 g of ethane (C₂H₆) in the balanced redox reaction: 2 C₂H₆(g) + 7 O₂(g) ® 4 CO₂(g) + 6 H₂O(g)?

77. 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

 

 

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

What is the molar mass of the compound show below?

 

90. 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

 

 

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

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.

1. 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

 

 

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)

Na⁺(s) + F^–(g) ® NaF(s)

Na(s) + F₂(g) ® NaF₂(s)

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

 

 

The conversion factor shown below was obtained from the balanced chemical equation: 4 KO₂(s) + 2 CO₂(g) ® 2 K₂CO₃(s) + 3 O₂(g). This conversion factor would be used to calculate which of the following?

 

1. 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

 

 

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?

 

 

1. 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

 

 

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?

 

 

 

 

 

1. 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

 

 

A student runs the reaction: LiOH + CO₂ ® LiHCO₃. The reaction consumes 45.0 g LiOH and produces 72.8 g of LiHCO₃. Which of the statements concerning this reaction is true?

72. 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

 

 

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

 

 

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

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

 

 

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

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

 

 

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

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

 

 

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

 

 

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

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

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

 

 

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

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

 

 

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

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

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

 

 

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

 

 

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

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

 

 

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

 

 

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

 

 

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

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

 

 

The combustion of hexane (C₆H₁₄), a component of gasoline, is represented by the balanced chemical equation: 2 C₆H₁₄(l) + 19 O₂(g) ® 12 CO₂(g) + 14 H₂O(g). If 1.0 mole of hexane undergoes combustion, _____ moles of O₂ 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