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

Test Bank For General Organic And Biological Chemistry 3rd Edition By Janice Smith

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 (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

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?

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