Portage Learning CHEM 121 Module 5 Exam | Foundations of General Chemistry w/ Lab (2026) Actual Q&A PDF

CHEM 121 Module 5 | Foundations of General Chemistry
w/Lab Exam Q&A | Portage Learning
These are original practice questions written for study. They cover common CHEM 121
Module 5 | Gases topics: pressure, gas laws, kinetic molecular theory, ideal gas law,
partial pressures, gas stoichiometry, effusion/diffusion, real gases, and clinical
applications.



Question 1:
Which of the following is the SI unit of pressure?
A. Atmosphere
B. Pascal
C. mmHg
D. Torr

Correct answer: B
Rationale: The pascal (Pa) is the SI unit of pressure.



Question 2:
1 atm is equal to how many mmHg?
A. 100
B. 760
C. 1000
D. 14.7

Correct answer: B
Rationale: 1 atm = 760 mmHg.



Question 3:
1 atm is approximately equal to how many kPa?
A. 101.3
B. 760
C. 14.7
D. 273

Correct answer: A
Rationale: 1 atm = 101.325 kPa.

,Question 4:
A barometer is used to measure:
A. Atmospheric pressure
B. Blood pressure
C. Gas volume
D. Temperature

Correct answer: A
Rationale: A barometer measures atmospheric pressure.



Question 5:
A manometer is used to measure:
A. Atmospheric pressure only
B. Pressure of an enclosed gas
C. Gas density
D. Molar mass

Correct answer: B
Rationale: A manometer measures the pressure of a gas in a closed system.



Question 6:
Convert 2.0 atm to mmHg.
A. 380 mmHg
B. 760 mmHg
C. 1520 mmHg
D. 202 mmHg

Correct answer: C
Rationale: 2.0 atm × 760 mmHg/atm = 1520 mmHg.



Question 7:
Convert 380 mmHg to atm.
A. 0.50 atm
B. 1.0 atm
C. 2.0 atm
D. 5.0 atm

Correct answer: A
Rationale: 380 mmHg ÷ 760 mmHg/atm = 0.50 atm.

, Question 8:
Pressure increases when:
A. Force decreases
B. Area increases
C. Force increases or area decreases
D. Volume increases

Correct answer: C
Rationale: Pressure = force/area, so increased force or decreased area raises pressure.



Question 9:
Which of the following is NOT a unit of pressure?
A. atm
B. Pa
C. Torr
D. Joule

Correct answer: D
Rationale: Joule is a unit of energy, not pressure.



Question 10:
A nurse is reviewing an oxygen tank gauge reading 2200 psi. Which quantity is being
measured?
A. Volume
B. Pressure
C. Temperature
D. Flow rate

Correct answer: B
Rationale: psi (pounds per square inch) is a unit of pressure.



Question 11:
Boyle’s law states that at constant temperature and moles, pressure is:
A. Directly proportional to volume
B. Inversely proportional to volume
C. Independent of volume
D. Proportional to temperature

Correct answer: B
Rationale: Boyle’s law: P ∝ 1/V at constant T and n.