PORTAGE LEARNING CHEM 103
FINAL EXAM (2025/2026) – VERIFIED
QUESTIONS FROM EXAMS 1–6
Module 1: Scientific Notation and Unit Conversions (1–10)
Question 1: Convert 845.3 to exponential form and explain your answer.
A) 8.453 × 10²
B) 8.453 × 10³
C) 84.53 × 10¹
D) 0.8453 × 10³
Answer: A) 8.453 × 10²
Rationale: Since 845.3 is larger than 1, use a positive exponent. Move the decimal two places
left: 845.3 = 8.453 × 10².
Question 2: Convert 3.21 × 10⁻⁵ to ordinary form and explain your answer.
A) 0.0000321
B) 0.000321
C) 0.00321
D) 0.0321
Answer: A) 0.0000321
Rationale: Negative exponent (–5) means a number smaller than 1. Move the decimal five
places left: 3.21 × 10⁻⁵ = 0.0000321.
Question 3: Convert 24.6 grams to kilograms. Show all work.
A) 0.0246 kg
B) 0.246 kg
C) 2.46 kg
D) 24.6 kg
Answer: A) 0.0246 kg
Rationale: 1 kg = 1000 g. Divide: 24.6 g × (1 kg / 1000 g) = 0.0246 kg.
Question 4: Convert 6.3 feet to inches. Show all work.
A) 63 inches
B) 75.6 inches
C) 84 inches
D) 90 inches
Answer: B) 75.6 inches
Rationale: 1 ft = 12 inches. Multiply: 6.3 ft × 12 in/ft = 75.6 inches.
, Question 5: Convert 28°C to Kelvin. Show all work.
A) 255 K
B) 273 K
C) 301 K
D) 328 K
Answer: C) 301 K
Rationale: °K = °C + 273. Calculate: 28 + 273 = 301 K.
Question 6: Convert 158°F to °C. Show all work.
A) 60°C
B) 70°C
C) 80°C
D) 90°C
Answer: B) 70°C
Rationale: °C = (°F – 32) ÷ 1.8. Calculate: (158 – 32) ÷ 1.8 = 126 ÷ 1.8 = 70°C.
Question 7: Convert 343 K to °F. Show all work.
A) 140°F
B) 150°F
C) 158°F
D) 170°F
Answer: C) 158°F
Rationale: °C = K – 273 = 343 – 273 = 70°C. Then °F = °C × 1.8 + 32 = 70 × 1.8 + 32 = 126 +
32 = 158°F.
Question 8: Convert 1.5 gallons to pints. Show all work.
A) 6 pints
B) 8 pints
C) 10 pints
D) 12 pints
Answer: D) 12 pints
Rationale: 1 gallon = 4 quarts, 1 quart = 2 pints. Calculate: 1.5 gal × 4 qt/gal × 2 pt/qt = 1.5 × 8
= 12 pints.
Question 9: What is 0.045 meters in centimeters?
A) 0.45 cm
B) 4.5 cm
C) 45 cm
D) 450 cm
Answer: B) 4.5 cm
Rationale: 1 m = 100 cm. Multiply: 0.045 m × 100 cm/m = 4.5 cm.
Question 10: Convert 2.3 tons to pounds. Show all work.
A) 2300 lbs
B) 4600 lbs
C) 6900 lbs
FINAL EXAM (2025/2026) – VERIFIED
QUESTIONS FROM EXAMS 1–6
Module 1: Scientific Notation and Unit Conversions (1–10)
Question 1: Convert 845.3 to exponential form and explain your answer.
A) 8.453 × 10²
B) 8.453 × 10³
C) 84.53 × 10¹
D) 0.8453 × 10³
Answer: A) 8.453 × 10²
Rationale: Since 845.3 is larger than 1, use a positive exponent. Move the decimal two places
left: 845.3 = 8.453 × 10².
Question 2: Convert 3.21 × 10⁻⁵ to ordinary form and explain your answer.
A) 0.0000321
B) 0.000321
C) 0.00321
D) 0.0321
Answer: A) 0.0000321
Rationale: Negative exponent (–5) means a number smaller than 1. Move the decimal five
places left: 3.21 × 10⁻⁵ = 0.0000321.
Question 3: Convert 24.6 grams to kilograms. Show all work.
A) 0.0246 kg
B) 0.246 kg
C) 2.46 kg
D) 24.6 kg
Answer: A) 0.0246 kg
Rationale: 1 kg = 1000 g. Divide: 24.6 g × (1 kg / 1000 g) = 0.0246 kg.
Question 4: Convert 6.3 feet to inches. Show all work.
A) 63 inches
B) 75.6 inches
C) 84 inches
D) 90 inches
Answer: B) 75.6 inches
Rationale: 1 ft = 12 inches. Multiply: 6.3 ft × 12 in/ft = 75.6 inches.
, Question 5: Convert 28°C to Kelvin. Show all work.
A) 255 K
B) 273 K
C) 301 K
D) 328 K
Answer: C) 301 K
Rationale: °K = °C + 273. Calculate: 28 + 273 = 301 K.
Question 6: Convert 158°F to °C. Show all work.
A) 60°C
B) 70°C
C) 80°C
D) 90°C
Answer: B) 70°C
Rationale: °C = (°F – 32) ÷ 1.8. Calculate: (158 – 32) ÷ 1.8 = 126 ÷ 1.8 = 70°C.
Question 7: Convert 343 K to °F. Show all work.
A) 140°F
B) 150°F
C) 158°F
D) 170°F
Answer: C) 158°F
Rationale: °C = K – 273 = 343 – 273 = 70°C. Then °F = °C × 1.8 + 32 = 70 × 1.8 + 32 = 126 +
32 = 158°F.
Question 8: Convert 1.5 gallons to pints. Show all work.
A) 6 pints
B) 8 pints
C) 10 pints
D) 12 pints
Answer: D) 12 pints
Rationale: 1 gallon = 4 quarts, 1 quart = 2 pints. Calculate: 1.5 gal × 4 qt/gal × 2 pt/qt = 1.5 × 8
= 12 pints.
Question 9: What is 0.045 meters in centimeters?
A) 0.45 cm
B) 4.5 cm
C) 45 cm
D) 450 cm
Answer: B) 4.5 cm
Rationale: 1 m = 100 cm. Multiply: 0.045 m × 100 cm/m = 4.5 cm.
Question 10: Convert 2.3 tons to pounds. Show all work.
A) 2300 lbs
B) 4600 lbs
C) 6900 lbs
