CHEM 1411 VERIFIED ANSWERS AND QUESTIONS - MOST RECENT
EDITION 2026
General Chemistry I | Topics: Matter, Atoms, Nomenclature, Stoichiometry, Solutions,
Gases, Thermochemistry, Electronic Structure & Bonding
)
1. Which of the following is a physical change?
A) Burning wood
B) Melting ice
C) Rusting iron
D) Digesting food
Answer: B
2. Which of the following is a chemical change?
A) Dissolving salt in water
B) Cutting paper
C) Burning magnesium
D) Boiling water
Answer: C
3. What is the SI base unit of mass?
A) Gram
B) Kilogram
C) Pound
D) Milligram
Answer: B
4. Which prefix means 1/1000?
A) Milli-
B) Micro-
C) Nano-
D) Centi-
Answer: A
5. A homogeneous mixture is also called a:
A) Compound
B) Suspension
C) Solution
D) Colloid
, Answer: C
6. Which of the following is an intensive property?
A) Mass
B) Density
C) Volume
D) Length
Answer: B
7. How many significant figures are in 0.00450?
A) 5
B) 2
C) 3
D) 6
Answer: C
8. The measurement 2.50 × 10³ g has how many significant figures?
A) 2
B) 3
C) 4
D) 5
Answer: B
9. Which of the following is a pure substance?
A) Air
B) Seawater
C) Brass
D) Sodium chloride
Answer: D
10. What is the density of a substance with mass 45.0 g and volume 15.0 mL?
A) 3.00 g/mL
B) 0.333 g/mL
C) 675 g/mL
D) 30.0 g/mL
Answer: A
11. Which of the following correctly rounds 4.8752 to 3 significant figures?
A) 4.87
B) 4.88
C) 4.875
D) 4.9
Answer: B
,12. 1 kilometer equals how many meters?
A) 10
B) 100
C) 1000
D) 0.001
Answer: C
13. Which of the following separates a heterogeneous mixture?
A) Filtration
B) Distillation
C) Chromatography
D) Crystallization
Answer: A
14. Temperature in Kelvin is related to Celsius by:
A) K = °C + 237
B) K = °C + 273.15
C) K = °C − 273
D) K = °C × 1.8 + 32
Answer: B
15. An element is best defined as:
A) A homogeneous mixture
B) A substance made of two or more compounds
C) Any liquid substance
D) A pure substance that cannot be broken down by chemical means
Answer: D
16. Which of the following is a compound?
A) Oxygen gas (O₂)
B) Copper metal
C) Water (H₂O)
D) Neon gas
Answer: C
17. Which state of matter has a definite shape and volume?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: A
18. Which of the following is an example of an extensive property?
A) Boiling point
, B) Density
C) Color
D) Mass
Answer: D
19. The correct result of 2.5 + 3.42 with proper significant figures is:
A) 5.9
B) 5.92
C) 5.920
D) 6.0
Answer: B
20. Which of the following best describes accuracy?
A) How close a measurement is to the true value
B) How reproducible measurements are
C) How many sig figs a measurement has
D) How large a measurement is
Answer: A
21. How many mL are in 2.5 L?
A) 0.0025 mL
B) 25 mL
C) 2500 mL
D) 250 mL
Answer: C
22. Which of the following is NOT a physical property?
A) Melting point
B) Flammability
C) Color
D) Solubility
Answer: B
23. Scientific notation for 0.000345 is:
A) 3.45 × 10⁻⁴
B) 3.45 × 10⁴
C) 34.5 × 10⁻⁵
D) 0.345 × 10⁻³
Answer: A
24. Percent error is calculated as:
A) (measured − true)/measured × 100
B) (true − measured)/true
C) |measured − true|/true × 100
EDITION 2026
General Chemistry I | Topics: Matter, Atoms, Nomenclature, Stoichiometry, Solutions,
Gases, Thermochemistry, Electronic Structure & Bonding
)
1. Which of the following is a physical change?
A) Burning wood
B) Melting ice
C) Rusting iron
D) Digesting food
Answer: B
2. Which of the following is a chemical change?
A) Dissolving salt in water
B) Cutting paper
C) Burning magnesium
D) Boiling water
Answer: C
3. What is the SI base unit of mass?
A) Gram
B) Kilogram
C) Pound
D) Milligram
Answer: B
4. Which prefix means 1/1000?
A) Milli-
B) Micro-
C) Nano-
D) Centi-
Answer: A
5. A homogeneous mixture is also called a:
A) Compound
B) Suspension
C) Solution
D) Colloid
, Answer: C
6. Which of the following is an intensive property?
A) Mass
B) Density
C) Volume
D) Length
Answer: B
7. How many significant figures are in 0.00450?
A) 5
B) 2
C) 3
D) 6
Answer: C
8. The measurement 2.50 × 10³ g has how many significant figures?
A) 2
B) 3
C) 4
D) 5
Answer: B
9. Which of the following is a pure substance?
A) Air
B) Seawater
C) Brass
D) Sodium chloride
Answer: D
10. What is the density of a substance with mass 45.0 g and volume 15.0 mL?
A) 3.00 g/mL
B) 0.333 g/mL
C) 675 g/mL
D) 30.0 g/mL
Answer: A
11. Which of the following correctly rounds 4.8752 to 3 significant figures?
A) 4.87
B) 4.88
C) 4.875
D) 4.9
Answer: B
,12. 1 kilometer equals how many meters?
A) 10
B) 100
C) 1000
D) 0.001
Answer: C
13. Which of the following separates a heterogeneous mixture?
A) Filtration
B) Distillation
C) Chromatography
D) Crystallization
Answer: A
14. Temperature in Kelvin is related to Celsius by:
A) K = °C + 237
B) K = °C + 273.15
C) K = °C − 273
D) K = °C × 1.8 + 32
Answer: B
15. An element is best defined as:
A) A homogeneous mixture
B) A substance made of two or more compounds
C) Any liquid substance
D) A pure substance that cannot be broken down by chemical means
Answer: D
16. Which of the following is a compound?
A) Oxygen gas (O₂)
B) Copper metal
C) Water (H₂O)
D) Neon gas
Answer: C
17. Which state of matter has a definite shape and volume?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: A
18. Which of the following is an example of an extensive property?
A) Boiling point
, B) Density
C) Color
D) Mass
Answer: D
19. The correct result of 2.5 + 3.42 with proper significant figures is:
A) 5.9
B) 5.92
C) 5.920
D) 6.0
Answer: B
20. Which of the following best describes accuracy?
A) How close a measurement is to the true value
B) How reproducible measurements are
C) How many sig figs a measurement has
D) How large a measurement is
Answer: A
21. How many mL are in 2.5 L?
A) 0.0025 mL
B) 25 mL
C) 2500 mL
D) 250 mL
Answer: C
22. Which of the following is NOT a physical property?
A) Melting point
B) Flammability
C) Color
D) Solubility
Answer: B
23. Scientific notation for 0.000345 is:
A) 3.45 × 10⁻⁴
B) 3.45 × 10⁴
C) 34.5 × 10⁻⁵
D) 0.345 × 10⁻³
Answer: A
24. Percent error is calculated as:
A) (measured − true)/measured × 100
B) (true − measured)/true
C) |measured − true|/true × 100
