- Which of the following is a factor that can cause deviations from ideal gas behavior?
A) The size of gas molecules
B) The temperature of the gas
C) The pressure of the gas
D) All of the above
Answer: D) All of the above
Explanation: All these factors can influence how closely a real gas behaves to an ideal gas, especially at high pressures and low temperatures.
- The average kinetic energy of gas molecules is directly proportional to what?
A) Volume
B) Pressure
C) Temperature
D) Density
Answer: C) Temperature
- If a gas is compressed to half its original volume while maintaining temperature, what happens to the pressure?
A) It remains the same
B) It halves
C) It doubles
D) It quadruples
Answer: C) It doubles
Explanation: According to Boyle’s Law, pressure is inversely proportional to volume; thus, if volume is halved, pressure doubles.
- What happens to the pressure of a gas if the number of moles is doubled while keeping temperature and volume constant?
A) It remains constant
B) It doubles
C) It halves
D) It quadruples
Answer: B) It doubles
Explanation: According to the Ideal Gas Law, if the number of moles increases while volume and temperature are constant, pressure will also increase proportionally.
- Which gas law would you use to determine the volume of a gas if the temperature and pressure are changed?
A) Ideal Gas Law
B) Dalton’s Law
C) Graham’s Law
D) Charles’s Law
Answer: A) Ideal Gas Law
Explanation: The Ideal Gas Law can be used to calculate the volume of a gas when temperature and pressure are altered.
- If the temperature of a gas is decreased while the volume remains constant, what happens to the pressure?
A) It increases
B) It remains the same
C) It decreases
D) It fluctuates
Answer: C) It decreases
Explanation: According to Gay-Lussac’s Law, if temperature decreases while volume is constant, pressure also decreases.
- What is the term for the ratio of the number of moles of a gas to its volume at a given temperature and pressure?
A) Molarity
B) Density
C) Molar volume
D) Partial pressure
Answer: C) Molar volume
Explanation: Molar volume is defined as the volume occupied by one mole of a substance at a given temperature and pressure, typically at STP.
- What does a compressibility factor (Z) greater than 1 indicate?
A) The gas behaves ideally
B) The gas is less compressible than an ideal gas
C) The gas has stronger intermolecular forces
D) Both B and C
Answer: D) Both B and C
Explanation: A compressibility factor greater than 1 indicates that the gas is less compressible than an ideal gas due to significant intermolecular forces.
- Which law relates the pressure of a gas to its absolute temperature at constant volume?
A) Boyle’s Law
B) Charles’s Law
C) Gay-Lussac’s Law
D) Avogadro’s Law
Answer: C) Gay-Lussac’s Law
Explanation: Gay-Lussac’s Law states that pressure is directly proportional to absolute temperature when volume is held constant.
- If two gases have the same temperature and pressure, what can be said about their volumes?
A) They must have the same volume.
B) Their volumes will differ.
C) One gas must be heavier.
D) Their volumes depend on the number of moles.
Answer: A) They must have the same volume.
Explanation: According to Avogadro’s Law, equal volumes of gases at the same temperature and pressure contain an equal number of moles.
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