,CHEM 103 Module 4 | Practice Q&A | 2026/2027 | Chemistry |
Portage Learning | 100% PASS
1. Boyle's Law states that the volume of a gas is:
A) Directly proportional to pressure at constant temperature
B) Inversely proportional to pressure at constant temperature
C) Directly proportional to temperature at constant pressure
D) Inversely proportional to temperature at constant pressure
Correct Answer: Inversely proportional to pressure at constant temperature
Rationale: Boyle's Law states that for a fixed amount of gas at constant
temperature, the volume of the gas is inversely proportional to its pressure,
expressed as P₁V₁ = P₂V₂.
2. Charles's Law states that the volume of a gas is:
A) Directly proportional to pressure at constant temperature
B) Inversely proportional to pressure at constant temperature
C) Directly proportional to temperature at constant pressure
D) Inversely proportional to temperature at constant pressure
Correct Answer: Directly proportional to temperature at constant pressure
Rationale: Charles's Law states that for a fixed amount of gas at constant
pressure, the volume of the gas is directly proportional to its absolute
temperature, expressed as V₁/T₁ = V₂/T₂.
3. Gay-Lussac's Law states that the pressure of a gas is:
A) Directly proportional to temperature at constant volume
,B) Inversely proportional to temperature at constant volume
C) Directly proportional to volume at constant temperature
D) Inversely proportional to volume at constant temperature
Correct Answer: Directly proportional to temperature at constant volume
Rationale: Gay-Lussac's Law states that for a fixed amount of gas at constant
volume, the pressure of the gas is directly proportional to its absolute
temperature, expressed as P₁/T₁ = P₂/T₂.
4. What is the value of standard temperature in Kelvin?
A) 0 K
B) 25 K
C) 273.15 K
D) 298.15 K
Correct Answer: 273.15 K
Rationale: Standard temperature is defined as 0°C, which is equal to 273.15
K. This is used in STP conditions alongside standard pressure of 1 atm.
5. What is the value of standard pressure in atm?
A) 0.5 atm
B) 1 atm
C) 1.5 atm
D) 2 atm
Correct Answer: 1 atm
, Rationale: Standard pressure is defined as 1 atmosphere (atm), which is
equivalent to 760 mmHg or 101.325 kPa. Together with standard
temperature (273.15 K), this defines STP.
6. What is the molar volume of an ideal gas at STP?
A) 1.0 L/mol
B) 22.4 L/mol
C) 24.5 L/mol
D) 44.8 L/mol
Correct Answer: 22.4 L/mol
Rationale: At STP (0°C and 1 atm), one mole of any ideal gas occupies 22.4 L.
This is a fundamental value used in gas stoichiometry calculations.
7. A gas occupies 4.0 L at 2.0 atm. What volume will it occupy at 1.0 atm,
assuming constant temperature?
A) 2.0 L
B) 4.0 L
C) 8.0 L
D) 16.0 L
Correct Answer: 8.0 L
Rationale: Using Boyle's Law: P₁V₁ = P₂V₂. V₂ = (P₁V₁)/P₂ = (2.0 atm × 4.0 L) /
1.0 atm = 8.0 L. Volume increases as pressure decreases.
Portage Learning | 100% PASS
1. Boyle's Law states that the volume of a gas is:
A) Directly proportional to pressure at constant temperature
B) Inversely proportional to pressure at constant temperature
C) Directly proportional to temperature at constant pressure
D) Inversely proportional to temperature at constant pressure
Correct Answer: Inversely proportional to pressure at constant temperature
Rationale: Boyle's Law states that for a fixed amount of gas at constant
temperature, the volume of the gas is inversely proportional to its pressure,
expressed as P₁V₁ = P₂V₂.
2. Charles's Law states that the volume of a gas is:
A) Directly proportional to pressure at constant temperature
B) Inversely proportional to pressure at constant temperature
C) Directly proportional to temperature at constant pressure
D) Inversely proportional to temperature at constant pressure
Correct Answer: Directly proportional to temperature at constant pressure
Rationale: Charles's Law states that for a fixed amount of gas at constant
pressure, the volume of the gas is directly proportional to its absolute
temperature, expressed as V₁/T₁ = V₂/T₂.
3. Gay-Lussac's Law states that the pressure of a gas is:
A) Directly proportional to temperature at constant volume
,B) Inversely proportional to temperature at constant volume
C) Directly proportional to volume at constant temperature
D) Inversely proportional to volume at constant temperature
Correct Answer: Directly proportional to temperature at constant volume
Rationale: Gay-Lussac's Law states that for a fixed amount of gas at constant
volume, the pressure of the gas is directly proportional to its absolute
temperature, expressed as P₁/T₁ = P₂/T₂.
4. What is the value of standard temperature in Kelvin?
A) 0 K
B) 25 K
C) 273.15 K
D) 298.15 K
Correct Answer: 273.15 K
Rationale: Standard temperature is defined as 0°C, which is equal to 273.15
K. This is used in STP conditions alongside standard pressure of 1 atm.
5. What is the value of standard pressure in atm?
A) 0.5 atm
B) 1 atm
C) 1.5 atm
D) 2 atm
Correct Answer: 1 atm
, Rationale: Standard pressure is defined as 1 atmosphere (atm), which is
equivalent to 760 mmHg or 101.325 kPa. Together with standard
temperature (273.15 K), this defines STP.
6. What is the molar volume of an ideal gas at STP?
A) 1.0 L/mol
B) 22.4 L/mol
C) 24.5 L/mol
D) 44.8 L/mol
Correct Answer: 22.4 L/mol
Rationale: At STP (0°C and 1 atm), one mole of any ideal gas occupies 22.4 L.
This is a fundamental value used in gas stoichiometry calculations.
7. A gas occupies 4.0 L at 2.0 atm. What volume will it occupy at 1.0 atm,
assuming constant temperature?
A) 2.0 L
B) 4.0 L
C) 8.0 L
D) 16.0 L
Correct Answer: 8.0 L
Rationale: Using Boyle's Law: P₁V₁ = P₂V₂. V₂ = (P₁V₁)/P₂ = (2.0 atm × 4.0 L) /
1.0 atm = 8.0 L. Volume increases as pressure decreases.
