CHEM 103 General Chemistry I Exam Bank:
Modules 1-6 & Final Exam (Portage Learning)
CHEM 103 General Chemistry I Exam Bank Modules 1-6 & Final Exam | Portage
Learning | 2026/2027 Edition
Below is a comprehensive exam bank for the CHEM 103 General Chemistry I
course at Portage Learning, covering Modules 1 through 6 and the Final Exam.
This resource includes 200+ questions with verified answers and detailed
rationales, organized by module according to the official Portage Learning
curriculum .
MODULE 1: INTRODUCTION, MEASUREMENT, AND DENSITY (Questions
1–30)
Q1. Convert 0.000451 to scientific notation.
A) 4.51 × 10⁻⁴
B) 45.1 × 10⁻⁵
C) 4.51 × 10⁴
D) 0.451 × 10⁻³
Answer: A
1
,Rationale: To convert a number less than 1 into scientific notation, move the
decimal point to the right until it is placed after the first nonzero digit. For
0.000451, the decimal moves 4 places to the right to get 4.51. Because the original
number is less than 1, the exponent must be negative, resulting in 4.51 × 10⁻⁴ .
Q2. Convert 845.3 to exponential form.
A) 8.453 × 10²
B) 84.53 × 10¹
C) 8.453 × 10³
D) 0.8453 × 10³
Answer: A
Rationale: Since 845.3 is larger than 1, the exponent is positive. Move the decimal
2 places to the left to get 8.453 × 10² .
Q3. Convert 3.21 × 10⁻⁵ to ordinary form.
2
,A) 0.0000321
B) 0.000321
C) 321,000
D) 0.00000321
Answer: A
Rationale: A negative exponent means the number is smaller than 1. Move the
decimal 5 places to the left: 3.21 × 10⁻⁵ = 0.0000321 .
Q4. Convert 24.6 grams to kilograms.
A) 0.0246 kg
B) 0.246 kg
C) 2.46 kg
D) 24,600 kg
Answer: A
3
, Rationale: 24.6 g × (1 kg / 1000 g) = 0.0246 kg .
Q5. Convert 6.3 feet to inches.
A) 63 inches
B) 75.6 inches
C) 0.525 inches
D) 756 inches
Answer: B
Rationale: 6.3 ft × (12 in / 1 ft) = 75.6 inches .
Q6. Convert 28°C to Kelvin.
A) 301 K
B) 245 K
4
Modules 1-6 & Final Exam (Portage Learning)
CHEM 103 General Chemistry I Exam Bank Modules 1-6 & Final Exam | Portage
Learning | 2026/2027 Edition
Below is a comprehensive exam bank for the CHEM 103 General Chemistry I
course at Portage Learning, covering Modules 1 through 6 and the Final Exam.
This resource includes 200+ questions with verified answers and detailed
rationales, organized by module according to the official Portage Learning
curriculum .
MODULE 1: INTRODUCTION, MEASUREMENT, AND DENSITY (Questions
1–30)
Q1. Convert 0.000451 to scientific notation.
A) 4.51 × 10⁻⁴
B) 45.1 × 10⁻⁵
C) 4.51 × 10⁴
D) 0.451 × 10⁻³
Answer: A
1
,Rationale: To convert a number less than 1 into scientific notation, move the
decimal point to the right until it is placed after the first nonzero digit. For
0.000451, the decimal moves 4 places to the right to get 4.51. Because the original
number is less than 1, the exponent must be negative, resulting in 4.51 × 10⁻⁴ .
Q2. Convert 845.3 to exponential form.
A) 8.453 × 10²
B) 84.53 × 10¹
C) 8.453 × 10³
D) 0.8453 × 10³
Answer: A
Rationale: Since 845.3 is larger than 1, the exponent is positive. Move the decimal
2 places to the left to get 8.453 × 10² .
Q3. Convert 3.21 × 10⁻⁵ to ordinary form.
2
,A) 0.0000321
B) 0.000321
C) 321,000
D) 0.00000321
Answer: A
Rationale: A negative exponent means the number is smaller than 1. Move the
decimal 5 places to the left: 3.21 × 10⁻⁵ = 0.0000321 .
Q4. Convert 24.6 grams to kilograms.
A) 0.0246 kg
B) 0.246 kg
C) 2.46 kg
D) 24,600 kg
Answer: A
3
, Rationale: 24.6 g × (1 kg / 1000 g) = 0.0246 kg .
Q5. Convert 6.3 feet to inches.
A) 63 inches
B) 75.6 inches
C) 0.525 inches
D) 756 inches
Answer: B
Rationale: 6.3 ft × (12 in / 1 ft) = 75.6 inches .
Q6. Convert 28°C to Kelvin.
A) 301 K
B) 245 K
4
