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CHEM 103 GENERAL CHEMISTRY I EXAM BANK:
MODULES 1-6 & FINAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES
COMPETENCY DOMAINS
• Matter, Measurement, and Significant Figures
• Atomic Structure and Electronic Configuration
• Periodic Trends and Periodicity
• Chemical Bonding, Molecular Geometry, and Polarity
• Stoichiometry, Moles, and Chemical Reactions
• Aqueous Solutions, Molarity, and Acid-Base Chemistry
• Gases, Thermochemistry, and Energy Changes
• Chemical Equilibrium and Final Exam Integration
INTRODUCTION
This comprehensive examination is designed to assess the knowledge, skills, and competency of
candidates preparing for CHEM 103 General Chemistry I Exam Bank: Modules 1-6 & Final Exam.
The assessment evaluates essential competencies across core domains through multiple-choice
and scenario-based questions. Candidates must demonstrate critical thinking, analytical skills,
and decision-making abilities required to apply knowledge effectively in professional practice.
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1. How many significant figures are in the measurement 0.0045600 g?
A. 3
B. 4
C. 5
D. 7
☑ Correct Answer: C
☑ Explanation: Leading zeros are not significant; the digits 4, 5, 6, 0, and 0 are
significant, giving 5 significant figures.
2. A metal sample has a mass of 54.6 g and occupies 6.00 cm³. What is its density?
A. 0.110 g/cm³
B. 6.00 g/cm³
C. 9.10 g/cm³
D. 54.6 g/cm³
☑ Correct Answer: C
☑ Explanation: Density = mass/volume = 54.6 g / 6.00 cm³ = 9.10 g/cm³.
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3. An element has two isotopes: 69.2% abundance at 62.93 amu and 30.8% at 64.93 amu.
What is its average atomic mass?
A. 63.55 amu
B. 63.93 amu
C. 64.55 amu
D. 65.00 amu
☑ Correct Answer: A
☑ Explanation: (0.692 × 62.93) + (0.308 × 64.93) = 43.55 + 20.00 = 63.55 amu.
4. How many moles are in 25.0 g of CaCO₃ (molar mass = 100.09 g/mol)?
A. 0.250 mol
B. 0.400 mol
C. 2.50 mol
D. 4.00 mol
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☑ Correct Answer: A
☑ Explanation: 25.0 g / 100.09 g/mol = 0.250 mol.
5. In the reaction 2H₂ + O₂ → 2H₂O, if 4.0 mol H₂ reacts with 1.0 mol O₂, which is limiting?
A. H₂
B. O₂
C. Both are limiting.
D. Neither is limiting.
☑ Correct Answer: B
☑ Explanation: 4.0 mol H₂ requires 2.0 mol O₂, but only 1.0 mol O₂ is available,
so O₂ limits the reaction.
6. What is the molarity of a solution containing 0.50 mol NaCl in 2.0 L solution?
A. 0.25 M
B. 0.50 M
C. 1.0 M
CHEM 103 GENERAL CHEMISTRY I EXAM BANK:
MODULES 1-6 & FINAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES
COMPETENCY DOMAINS
• Matter, Measurement, and Significant Figures
• Atomic Structure and Electronic Configuration
• Periodic Trends and Periodicity
• Chemical Bonding, Molecular Geometry, and Polarity
• Stoichiometry, Moles, and Chemical Reactions
• Aqueous Solutions, Molarity, and Acid-Base Chemistry
• Gases, Thermochemistry, and Energy Changes
• Chemical Equilibrium and Final Exam Integration
INTRODUCTION
This comprehensive examination is designed to assess the knowledge, skills, and competency of
candidates preparing for CHEM 103 General Chemistry I Exam Bank: Modules 1-6 & Final Exam.
The assessment evaluates essential competencies across core domains through multiple-choice
and scenario-based questions. Candidates must demonstrate critical thinking, analytical skills,
and decision-making abilities required to apply knowledge effectively in professional practice.
,2
1. How many significant figures are in the measurement 0.0045600 g?
A. 3
B. 4
C. 5
D. 7
☑ Correct Answer: C
☑ Explanation: Leading zeros are not significant; the digits 4, 5, 6, 0, and 0 are
significant, giving 5 significant figures.
2. A metal sample has a mass of 54.6 g and occupies 6.00 cm³. What is its density?
A. 0.110 g/cm³
B. 6.00 g/cm³
C. 9.10 g/cm³
D. 54.6 g/cm³
☑ Correct Answer: C
☑ Explanation: Density = mass/volume = 54.6 g / 6.00 cm³ = 9.10 g/cm³.
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3. An element has two isotopes: 69.2% abundance at 62.93 amu and 30.8% at 64.93 amu.
What is its average atomic mass?
A. 63.55 amu
B. 63.93 amu
C. 64.55 amu
D. 65.00 amu
☑ Correct Answer: A
☑ Explanation: (0.692 × 62.93) + (0.308 × 64.93) = 43.55 + 20.00 = 63.55 amu.
4. How many moles are in 25.0 g of CaCO₃ (molar mass = 100.09 g/mol)?
A. 0.250 mol
B. 0.400 mol
C. 2.50 mol
D. 4.00 mol
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☑ Correct Answer: A
☑ Explanation: 25.0 g / 100.09 g/mol = 0.250 mol.
5. In the reaction 2H₂ + O₂ → 2H₂O, if 4.0 mol H₂ reacts with 1.0 mol O₂, which is limiting?
A. H₂
B. O₂
C. Both are limiting.
D. Neither is limiting.
☑ Correct Answer: B
☑ Explanation: 4.0 mol H₂ requires 2.0 mol O₂, but only 1.0 mol O₂ is available,
so O₂ limits the reaction.
6. What is the molarity of a solution containing 0.50 mol NaCl in 2.0 L solution?
A. 0.25 M
B. 0.50 M
C. 1.0 M
