1
CHEM 103 General Chemistry I Portage Learning
2026/2027 Actual Exam | Module 1-6 Exams & Final
with Verified Questions & Correct Answers | Pass
Guaranteed - A+ Graded
Module 1: Matter, Measurements, and Calculations (35 Questions)
Q1: Which of the following is a homogeneous mixture?
A. Sand and water
B. Oil and vinegar
C. Saltwater [CORRECT]
D. Granite
Correct Answer: C
Rationale: Saltwater is a homogeneous mixture (solution) where the components are uniformly
distributed at the molecular level. Sand and water (A) is heterogeneous with visible particles. Oil
and vinegar (B) separates into layers. Granite (D) has visible different minerals.
Q2: Convert 25°C to Kelvin.
A. 248 K
B. 298 K [CORRECT]
C. 273 K
D. 25 K
Correct Answer: B
Rationale: K = °C + 273.15. 25 + 273.15 = 298.15 K ≈ 298 K. Option A incorrectly subtracted.
Option C is the freezing point of water. Option D confuses Celsius and Kelvin scales.
Q3: The density of a substance is 2.5 g/mL. What is the mass of 50 mL of this substance?
A. 20 g
B. 125 g [CORRECT]
C. 52.5 g
D. 0.05 g
,2
Correct Answer: B
Rationale: Mass = Density × Volume = 2.5 g/mL × 50 mL = 125 g. Option A results from
dividing instead of multiplying. Option C incorrectly adds values. Option D is a decimal error.
Q4: How many significant figures are in the number 0.00450?
A. 2
B. 3 [CORRECT]
C. 4
D. 5
Correct Answer: B
Rationale: Leading zeros are not significant. The significant digits are 4, 5, and the trailing zero
after the decimal (4, 5, 0 = 3 significant figures). The decimal point makes the trailing zero
significant.
Q5: Which of the following represents a chemical change?
A. Melting ice
B. Dissolving sugar in water
C. Burning wood [CORRECT]
D. Breaking glass
Correct Answer: C
Rationale: Burning wood is a chemical change producing new substances (CO₂, H₂O, ash).
Options A, B, and D are physical changes where no new substances form.
Q6: Convert 98.6°F to Celsius.
A. 37.0°C [CORRECT]
B. 21.4°C
C. 72.0°C
D. 52.3°C
Correct Answer: A
Rationale: °C = (°F - 32) × 5/9 = (98.6 - 32) × 5/9 = 66.6 × 5/9 = 37.0°C. Option B forgot to
subtract 32 first. Option C used incorrect formula. Option D is calculation error.
Q7: Express 0.0000567 in scientific notation.
,3
A. 5.67 × 10⁴
B. 5.67 × 10⁻⁵ [CORRECT]
C. 567 × 10⁻⁷
D. 56.7 × 10⁻⁶
Correct Answer: B
Rationale: Move decimal 5 places right: 5.67 × 10⁻⁵. Option A has wrong exponent sign. Options
C and D are not proper scientific notation (coefficient must be 1-10).
Q8: Which state of matter has definite volume but indefinite shape?
A. Solid
B. Liquid [CORRECT]
C. Gas
D. Plasma
Correct Answer: B
Rationale: Liquids have definite volume but take the shape of their container. Solids (A) have
definite shape and volume. Gases (C) and plasma (D) have neither definite shape nor volume.
Q9: Calculate: 12.34 + 1.2 + 0.05 = ? (considering significant figures)
A. 13.59
B. 13.6 [CORRECT]
C. 14
D. 13.590
Correct Answer: B
Rationale: For addition, round to least decimal places. 1.2 has 1 decimal place, so answer is 13.6.
Option A ignores sig figs. Option C rounds too much. Option D implies false precision.
Q10: Which of the following is an extensive property?
A. Density
B. Boiling point
C. Mass [CORRECT]
D. Color
, 4
Correct Answer: C
Rationale: Extensive properties depend on amount (mass, volume). Intensive properties (A, B,
D) are independent of amount.
Q11: The specific gravity of a liquid is 1.2. If the density of water is 1.0 g/mL, what is the
density of the liquid?
A. 0.83 g/mL
B. 1.2 g/mL [CORRECT]
C. 2.2 g/mL
D. Cannot be determined
Correct Answer: B
Rationale: Specific gravity = density of substance ÷ density of water. Density = 1.2 × 1.0 g/mL =
1.2 g/mL.
Q12: How many milliliters are in 2.5 liters?
A. 0.25 mL
B. 25 mL
C. 250 mL
D. 2,500 mL [CORRECT]
Correct Answer: D
Rationale: 1 L = 1,000 mL. 2.5 L × 1,000 mL/L = 2,500 mL. Options A, B, and C are decimal
errors.
Q13: Which separation technique is best for separating a mixture of sand and salt?
A. Filtration only
B. Dissolving in water, then filtration and evaporation [CORRECT]
C. Distillation only
D. Chromatography
Correct Answer: B
Rationale: Salt dissolves in water while sand doesn't. Filter to remove sand, then evaporate water
to recover salt. Filtration alone (A) doesn't separate dissolved salt.
Q14: Convert 300 K to Celsius.
CHEM 103 General Chemistry I Portage Learning
2026/2027 Actual Exam | Module 1-6 Exams & Final
with Verified Questions & Correct Answers | Pass
Guaranteed - A+ Graded
Module 1: Matter, Measurements, and Calculations (35 Questions)
Q1: Which of the following is a homogeneous mixture?
A. Sand and water
B. Oil and vinegar
C. Saltwater [CORRECT]
D. Granite
Correct Answer: C
Rationale: Saltwater is a homogeneous mixture (solution) where the components are uniformly
distributed at the molecular level. Sand and water (A) is heterogeneous with visible particles. Oil
and vinegar (B) separates into layers. Granite (D) has visible different minerals.
Q2: Convert 25°C to Kelvin.
A. 248 K
B. 298 K [CORRECT]
C. 273 K
D. 25 K
Correct Answer: B
Rationale: K = °C + 273.15. 25 + 273.15 = 298.15 K ≈ 298 K. Option A incorrectly subtracted.
Option C is the freezing point of water. Option D confuses Celsius and Kelvin scales.
Q3: The density of a substance is 2.5 g/mL. What is the mass of 50 mL of this substance?
A. 20 g
B. 125 g [CORRECT]
C. 52.5 g
D. 0.05 g
,2
Correct Answer: B
Rationale: Mass = Density × Volume = 2.5 g/mL × 50 mL = 125 g. Option A results from
dividing instead of multiplying. Option C incorrectly adds values. Option D is a decimal error.
Q4: How many significant figures are in the number 0.00450?
A. 2
B. 3 [CORRECT]
C. 4
D. 5
Correct Answer: B
Rationale: Leading zeros are not significant. The significant digits are 4, 5, and the trailing zero
after the decimal (4, 5, 0 = 3 significant figures). The decimal point makes the trailing zero
significant.
Q5: Which of the following represents a chemical change?
A. Melting ice
B. Dissolving sugar in water
C. Burning wood [CORRECT]
D. Breaking glass
Correct Answer: C
Rationale: Burning wood is a chemical change producing new substances (CO₂, H₂O, ash).
Options A, B, and D are physical changes where no new substances form.
Q6: Convert 98.6°F to Celsius.
A. 37.0°C [CORRECT]
B. 21.4°C
C. 72.0°C
D. 52.3°C
Correct Answer: A
Rationale: °C = (°F - 32) × 5/9 = (98.6 - 32) × 5/9 = 66.6 × 5/9 = 37.0°C. Option B forgot to
subtract 32 first. Option C used incorrect formula. Option D is calculation error.
Q7: Express 0.0000567 in scientific notation.
,3
A. 5.67 × 10⁴
B. 5.67 × 10⁻⁵ [CORRECT]
C. 567 × 10⁻⁷
D. 56.7 × 10⁻⁶
Correct Answer: B
Rationale: Move decimal 5 places right: 5.67 × 10⁻⁵. Option A has wrong exponent sign. Options
C and D are not proper scientific notation (coefficient must be 1-10).
Q8: Which state of matter has definite volume but indefinite shape?
A. Solid
B. Liquid [CORRECT]
C. Gas
D. Plasma
Correct Answer: B
Rationale: Liquids have definite volume but take the shape of their container. Solids (A) have
definite shape and volume. Gases (C) and plasma (D) have neither definite shape nor volume.
Q9: Calculate: 12.34 + 1.2 + 0.05 = ? (considering significant figures)
A. 13.59
B. 13.6 [CORRECT]
C. 14
D. 13.590
Correct Answer: B
Rationale: For addition, round to least decimal places. 1.2 has 1 decimal place, so answer is 13.6.
Option A ignores sig figs. Option C rounds too much. Option D implies false precision.
Q10: Which of the following is an extensive property?
A. Density
B. Boiling point
C. Mass [CORRECT]
D. Color
, 4
Correct Answer: C
Rationale: Extensive properties depend on amount (mass, volume). Intensive properties (A, B,
D) are independent of amount.
Q11: The specific gravity of a liquid is 1.2. If the density of water is 1.0 g/mL, what is the
density of the liquid?
A. 0.83 g/mL
B. 1.2 g/mL [CORRECT]
C. 2.2 g/mL
D. Cannot be determined
Correct Answer: B
Rationale: Specific gravity = density of substance ÷ density of water. Density = 1.2 × 1.0 g/mL =
1.2 g/mL.
Q12: How many milliliters are in 2.5 liters?
A. 0.25 mL
B. 25 mL
C. 250 mL
D. 2,500 mL [CORRECT]
Correct Answer: D
Rationale: 1 L = 1,000 mL. 2.5 L × 1,000 mL/L = 2,500 mL. Options A, B, and C are decimal
errors.
Q13: Which separation technique is best for separating a mixture of sand and salt?
A. Filtration only
B. Dissolving in water, then filtration and evaporation [CORRECT]
C. Distillation only
D. Chromatography
Correct Answer: B
Rationale: Salt dissolves in water while sand doesn't. Filter to remove sand, then evaporate water
to recover salt. Filtration alone (A) doesn't separate dissolved salt.
Q14: Convert 300 K to Celsius.
