Portage Learning CHEM 103 Final Exam &
Modules 1-6 Actual Complete Practice
Questions, Correct Verified Answers and
Detailed Rationales Already Graded A+ | 2026
Updated
Ace your Portage Learning CHEM 103 course with this comprehensive 150-question practice
bank! Covers Modules 1-6 and the cumulative Final Exam. Features detailed questions on
density, electron configurations, stoichiometry, redox, gas laws, and VSEPR theor y. Every
question includes unbolded text, bold-italicized correct answers, and clear rationales to ensure
you understand the core chemistry principles. Perfect for nursing and pre-health students
needing a high grade.
,Module 1: Matter, Measurements, and Conversions
1. A piece of metal has a mass of 25.0 g and a volume of 5.0 mL. What is its density?
A) 0.20 g/mL
B) 5.0 g/mL
C) 125.0 g/mL
D) 20.0 g/mL
Rationale: Density = mass / volume. 25.0 g / 5.0 mL = 5.0 g/mL.
2. Which of the following is classified as a heterogeneous mixture?
A) Italian salad dressing
B) Clean ambient air
C) Sodium chloride dissolved in water
D) A 14-karat gold ring
Rationale: Italian dressing separates into distinct phases, making it non-uniform
throughout.
3. Convert 0.00345 into standard scientific notation.
A) 34.5 × 10⁻⁴
B) 3.45 × 10³
C) 3.45 × 10⁻³
D) 0.345 × 10⁻²
Rationale: Moving the decimal point 3 places to the right yields 3.45, requiring a 10⁻³
multiplier.
4. Which of the following values contains exactly three significant figures?
A) 0.034
B) 3400
C) 3.400
D) 0.00340
Rationale: Leading zeros are never significant. Trailing zeros after a decimal point are
significant.
5. A temperature of 25.0 °C is equal to what temperature in Kelvin?
A) -248.15 K
B) 77.0 K
C) 298.15 K
D) 310.15 K
Rationale: K = °C + 273.15. Thus, 25.0 + 273.15 = 298.15 K.
,6. Which of the following is an example of a chemical change?
A) Ice cubes melting at room temperature
B) Liquid water boiling into steam
C) A clean iron nail rusting in the rain
D) Crushing a sugar cube into powder
Rationale: Rusting forms a completely new chemical substance (iron oxide), which
indicates a chemical change.
7. How many meters are there in 5.4 kilometers?
A) 0.0054 m
B) 540 m
C) 5400 m
D) 54000 m
Rationale: 1 kilometer equals 1000 meters. 5.4 × 1000 = 5400 m.
8. What state of matter has a definite volume but takes the shape of its container?
A) Solid
B) Liquid
C) Gas
D) Plasma
Rationale: Liquids have strong enough intermolecular attractions to maintain volume,
but can flow to fit a container.
Module 2: Atoms, Molecules, and Ions (Questions 9–17)
9. How many protons, neutrons, and electrons are in a neutral atom of Carbon-14?
A) 6 protons, 6 neutrons, 6 electrons
B) 6 protons, 8 neutrons, 6 electrons
C) 8 protons, 6 neutrons, 8 electrons
D) 6 protons, 14 neutrons, 6 electrons
Rationale: Carbon always has 6 protons. Neutrons = Mass number (14) - Protons (6) =
8. It is neutral, so electrons match protons.
10. What is the correct ground-state electron configuration for a neutral Nitrogen atom
(atomic number 7)?
A) 1s² 2s² 2p¹
B) 1s² 2s² 2p⁶
C) 1s² 2s² 2p³
, D) 1s² 2s³ 2p²
Rationale: Nitrogen has 7 electrons filling the 1s, 2s, and 2p sublevels sequentially.
11. What is the correct chemical formula for the ionic compound Aluminum Oxide?
A) AlO
B) AlO₂
C) Al₃O₂
D) Al₂O₃
Rationale: Aluminum forms Al³⁺ and Oxygen forms O²⁻. Swapping charges balances
the compound to Al₂O₃.
12. What is the systematic name for the covalent compound N₂O₅?
A) Nitrogen oxide
B) Dinitrogen oxide
C) Dinitrogen pentoxide
D) Nitrogen pentoxide
Rationale: Covalent prefixes are mandatory. Two nitrogens = "di-", five oxygens =
"pent-".
13. Atoms of the same element that have different mass numbers are called what?
A) Ions
B) Isotopes
C) Allotropes
D) Isomers
Rationale: Isotopes share identical proton counts but carry a varying number of
neutrons.
14. What group on the periodic table is known as the Halogens?
A) Group 1
B) Group 2
C) Group 17
D) Group 18
Rationale: Group 17 elements (F, Cl, Br, I) are the reactive nonmetals called halogens.
15. What is the correct chemical formula for Calcium Nitrate?
A) CaNO₃
B) Ca(NO₃)₂
C) Ca₂NO₃
D) Ca₃(NO₃)₂
Modules 1-6 Actual Complete Practice
Questions, Correct Verified Answers and
Detailed Rationales Already Graded A+ | 2026
Updated
Ace your Portage Learning CHEM 103 course with this comprehensive 150-question practice
bank! Covers Modules 1-6 and the cumulative Final Exam. Features detailed questions on
density, electron configurations, stoichiometry, redox, gas laws, and VSEPR theor y. Every
question includes unbolded text, bold-italicized correct answers, and clear rationales to ensure
you understand the core chemistry principles. Perfect for nursing and pre-health students
needing a high grade.
,Module 1: Matter, Measurements, and Conversions
1. A piece of metal has a mass of 25.0 g and a volume of 5.0 mL. What is its density?
A) 0.20 g/mL
B) 5.0 g/mL
C) 125.0 g/mL
D) 20.0 g/mL
Rationale: Density = mass / volume. 25.0 g / 5.0 mL = 5.0 g/mL.
2. Which of the following is classified as a heterogeneous mixture?
A) Italian salad dressing
B) Clean ambient air
C) Sodium chloride dissolved in water
D) A 14-karat gold ring
Rationale: Italian dressing separates into distinct phases, making it non-uniform
throughout.
3. Convert 0.00345 into standard scientific notation.
A) 34.5 × 10⁻⁴
B) 3.45 × 10³
C) 3.45 × 10⁻³
D) 0.345 × 10⁻²
Rationale: Moving the decimal point 3 places to the right yields 3.45, requiring a 10⁻³
multiplier.
4. Which of the following values contains exactly three significant figures?
A) 0.034
B) 3400
C) 3.400
D) 0.00340
Rationale: Leading zeros are never significant. Trailing zeros after a decimal point are
significant.
5. A temperature of 25.0 °C is equal to what temperature in Kelvin?
A) -248.15 K
B) 77.0 K
C) 298.15 K
D) 310.15 K
Rationale: K = °C + 273.15. Thus, 25.0 + 273.15 = 298.15 K.
,6. Which of the following is an example of a chemical change?
A) Ice cubes melting at room temperature
B) Liquid water boiling into steam
C) A clean iron nail rusting in the rain
D) Crushing a sugar cube into powder
Rationale: Rusting forms a completely new chemical substance (iron oxide), which
indicates a chemical change.
7. How many meters are there in 5.4 kilometers?
A) 0.0054 m
B) 540 m
C) 5400 m
D) 54000 m
Rationale: 1 kilometer equals 1000 meters. 5.4 × 1000 = 5400 m.
8. What state of matter has a definite volume but takes the shape of its container?
A) Solid
B) Liquid
C) Gas
D) Plasma
Rationale: Liquids have strong enough intermolecular attractions to maintain volume,
but can flow to fit a container.
Module 2: Atoms, Molecules, and Ions (Questions 9–17)
9. How many protons, neutrons, and electrons are in a neutral atom of Carbon-14?
A) 6 protons, 6 neutrons, 6 electrons
B) 6 protons, 8 neutrons, 6 electrons
C) 8 protons, 6 neutrons, 8 electrons
D) 6 protons, 14 neutrons, 6 electrons
Rationale: Carbon always has 6 protons. Neutrons = Mass number (14) - Protons (6) =
8. It is neutral, so electrons match protons.
10. What is the correct ground-state electron configuration for a neutral Nitrogen atom
(atomic number 7)?
A) 1s² 2s² 2p¹
B) 1s² 2s² 2p⁶
C) 1s² 2s² 2p³
, D) 1s² 2s³ 2p²
Rationale: Nitrogen has 7 electrons filling the 1s, 2s, and 2p sublevels sequentially.
11. What is the correct chemical formula for the ionic compound Aluminum Oxide?
A) AlO
B) AlO₂
C) Al₃O₂
D) Al₂O₃
Rationale: Aluminum forms Al³⁺ and Oxygen forms O²⁻. Swapping charges balances
the compound to Al₂O₃.
12. What is the systematic name for the covalent compound N₂O₅?
A) Nitrogen oxide
B) Dinitrogen oxide
C) Dinitrogen pentoxide
D) Nitrogen pentoxide
Rationale: Covalent prefixes are mandatory. Two nitrogens = "di-", five oxygens =
"pent-".
13. Atoms of the same element that have different mass numbers are called what?
A) Ions
B) Isotopes
C) Allotropes
D) Isomers
Rationale: Isotopes share identical proton counts but carry a varying number of
neutrons.
14. What group on the periodic table is known as the Halogens?
A) Group 1
B) Group 2
C) Group 17
D) Group 18
Rationale: Group 17 elements (F, Cl, Br, I) are the reactive nonmetals called halogens.
15. What is the correct chemical formula for Calcium Nitrate?
A) CaNO₃
B) Ca(NO₃)₂
C) Ca₂NO₃
D) Ca₃(NO₃)₂
