Q. For an ideal gas, if the volume is halved while keeping the temperature constant, what happens to the pressure?
A.It remains the same
B.It doubles
C.It halves
D.It quadruples
Solution
According to Boyle's law, for a given mass of gas at constant temperature, the pressure is inversely proportional to the volume. Halving the volume will double the pressure.
Q. For an ideal gas, the equation of state is given by:
A.PV = nRT
B.PV = NkT
C.PV = mRT
D.PV = kT
Solution
The equation of state for an ideal gas is given by PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
Q. For an ideal gas, which equation relates pressure, volume, and temperature?
A.PV = nRT
B.PV = nR
C.PV = RT
D.PV = nT
Solution
The ideal gas law is given by the equation PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.
Q. If the molar mass of a gas is halved, what happens to its RMS speed?
A.Increases by a factor of sqrt(2)
B.Increases by a factor of 2
C.Decreases by a factor of sqrt(2)
D.Remains the same
Solution
If the molar mass is halved, the RMS speed increases by a factor of sqrt(2) because RMS speed is inversely proportional to the square root of molar mass.
Correct Answer: A — Increases by a factor of sqrt(2)
Q. If the RMS speed of a gas is 300 m/s, what is the RMS speed of the same gas at double the temperature?
A.300 m/s
B.600 m/s
C.300√2 m/s
D.600√2 m/s
Solution
The RMS speed is proportional to the square root of the temperature. If the temperature is doubled, the RMS speed increases by a factor of sqrt(2). Therefore, the new RMS speed will be 300 * sqrt(2), which is approximately 600 m/s.
Q. If the RMS speed of a gas is 400 m/s and its molar mass is 16 g/mol, what is the temperature of the gas?
A.200 K
B.400 K
C.800 K
D.1600 K
Solution
Using the formula v_rms = sqrt((3RT)/M), we can rearrange to find T: T = (M * v_rms^2) / (3R). Substituting M = 0.016 kg/mol and v_rms = 400 m/s gives T = 400 K.
Q. If the RMS speed of a gas is 400 m/s at 300 K, what will be the RMS speed at 600 K?
A.400 m/s
B.800 m/s
C.400√2 m/s
D.800√2 m/s
Solution
The RMS speed increases with the square root of the temperature. Therefore, at 600 K, the RMS speed will be 400 * sqrt(2), which is approximately 800 m/s.
Q. If the RMS speed of a gas is 500 m/s, what is the speed of the gas molecules in terms of average speed?
A.500 m/s
B.250 m/s
C.400 m/s
D.600 m/s
Solution
The average speed of gas molecules is related to the RMS speed by the relation v_avg = (v_rms * sqrt(8/3)). Therefore, the average speed is approximately 400 m/s.
Q. If the temperature of a gas is doubled at constant volume, what happens to the pressure?
A.It doubles
B.It halves
C.It remains the same
D.It quadruples
Solution
According to Gay-Lussac's Law, if the temperature of a gas is increased while keeping the volume constant, the pressure will also increase proportionally, thus it doubles.