States of Matter - Real Gases
Q. At which conditions do real gases behave most like ideal gases?
A.
High pressure and low temperature
B.
Low pressure and high temperature
C.
High pressure and high temperature
D.
Low pressure and low temperature
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Solution
Real gases behave most like ideal gases at low pressure and high temperature, where intermolecular forces are minimized.
Correct Answer: B — Low pressure and high temperature
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Q. What happens to the pressure of a real gas as the temperature decreases at constant volume?
A.
Pressure increases
B.
Pressure decreases
C.
Pressure remains constant
D.
Pressure fluctuates
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Solution
As the temperature decreases at constant volume, the kinetic energy of the gas molecules decreases, leading to a decrease in pressure.
Correct Answer: B — Pressure decreases
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Q. What is the critical point of a gas?
A.
The temperature at which a gas can no longer be liquefied
B.
The pressure at which a gas behaves ideally
C.
The temperature at which gas molecules stop moving
D.
The point at which gas volume is zero
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Solution
The critical point of a gas is the temperature and pressure at which it can no longer be liquefied, regardless of the pressure applied.
Correct Answer: A — The temperature at which a gas can no longer be liquefied
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Q. What is the effect of increasing the number of gas molecules in a container at constant volume?
A.
Pressure decreases
B.
Pressure increases
C.
Temperature decreases
D.
Volume increases
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Solution
Increasing the number of gas molecules in a container at constant volume increases the frequency of collisions with the walls, thus increasing pressure.
Correct Answer: B — Pressure increases
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Q. What is the primary reason real gases deviate from ideal gas behavior?
A.
Molecular size
B.
Intermolecular forces
C.
Temperature
D.
Pressure
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Solution
Intermolecular forces cause real gases to deviate from ideal behavior, especially at high pressures and low temperatures.
Correct Answer: B — Intermolecular forces
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Q. Which equation accounts for the volume occupied by gas molecules in real gases?
A.
Ideal Gas Law
B.
Van der Waals equation
C.
Boyle's Law
D.
Charles's Law
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Solution
The Van der Waals equation accounts for the volume occupied by gas molecules and the intermolecular forces in real gases.
Correct Answer: B — Van der Waals equation
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Q. Which factor does NOT affect the behavior of real gases?
A.
Temperature
B.
Pressure
C.
Volume
D.
Color
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Solution
Color does not affect the behavior of real gases; temperature, pressure, and volume are the primary factors.
Correct Answer: D — Color
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Q. Which of the following best describes the behavior of real gases compared to ideal gases?
A.
Real gases have no volume.
B.
Real gases do not exert intermolecular forces.
C.
Real gases deviate from ideal behavior at high pressures.
D.
Real gases behave exactly like ideal gases.
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Solution
Real gases deviate from ideal behavior at high pressures due to increased intermolecular forces and the volume occupied by gas molecules.
Correct Answer: C — Real gases deviate from ideal behavior at high pressures.
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Q. Which of the following gases is expected to behave most ideally?
A.
NH3
B.
CO2
C.
He
D.
H2O
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Solution
Helium (He) is a noble gas with minimal intermolecular forces and small molecular size, making it behave most ideally.
Correct Answer: C — He
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Q. Which of the following statements about real gases is true?
A.
Real gases have perfectly elastic collisions.
B.
Real gases have no intermolecular forces.
C.
Real gases occupy no volume.
D.
Real gases can condense into liquids.
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Solution
Real gases can condense into liquids under certain conditions, unlike ideal gases which are assumed to have no volume and no intermolecular forces.
Correct Answer: D — Real gases can condense into liquids.
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