#1
Which gas law describes the relationship between pressure and volume, assuming constant temperature and amount of gas?
Boyle's law
ExplanationPressure and volume are inversely proportional at constant temperature and amount of gas.
#2
A gas at 2 atm of pressure occupies 5 L. What volume will it occupy if the pressure is increased to 4 atm, assuming constant temperature?
2.5 L
ExplanationVolume decreases by half when pressure doubles, assuming constant temperature.
#3
What is the volume occupied by 2 moles of an ideal gas at 273 K and 1 atm pressure?
22.4 L
ExplanationAt standard temperature and pressure (STP), 1 mole of gas occupies 22.4 liters.
#4
Which gas law describes the relationship between temperature and volume, assuming constant pressure and amount of gas?
Charles's law
ExplanationVolume and temperature are directly proportional at constant pressure and amount of gas.
#5
Which gas law relates the pressure and temperature of a gas, assuming constant volume and amount of gas?
Gay-Lussac's law
ExplanationPressure and temperature are directly proportional at constant volume and amount of gas.
#6
According to the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is the temperature in which units?
Kelvin
ExplanationTemperature is expressed in Kelvin in the ideal gas law.
#7
Under which of the following conditions would a real gas behave most like an ideal gas?
Low pressure, high temperature
ExplanationReal gases behave most like ideal gases under conditions of low pressure and high temperature.
#8
A sample of gas has a volume of 4.0 L at 27°C. What will be its volume at 0°C, assuming constant pressure?
3.6 L
ExplanationVolume decreases by 10% when temperature decreases from 27°C to 0°C, assuming constant pressure.
#9
Which of the following gas laws states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual gases?
Dalton's law
ExplanationThe total pressure exerted by a mixture of gases is the sum of the pressures exerted by each gas alone.
#10
What volume will 2 moles of gas occupy at 0°C and 2 atm pressure?
22.4 L
ExplanationAt STP, 1 mole of gas occupies 22.4 liters; hence, 2 moles occupy twice the volume, i.e., 22.4 L.
#11
Which of the following gas laws can be derived from the kinetic theory of gases?
Ideal gas law
ExplanationThe ideal gas law can be derived from the kinetic theory of gases.
#12
A gas sample has a volume of 2.5 L at 27°C and 1 atm. If the volume is increased to 5.0 L and the temperature is raised to 127°C, what is the new pressure, assuming the amount of gas remains constant?
1.0 atm
ExplanationPressure remains constant at 1 atm regardless of changes in volume and temperature, assuming constant amount of gas.
#13
Which gas law is used to calculate the density of a gas at a given temperature and pressure?
Ideal gas law
ExplanationDensity can be calculated using the ideal gas law.
#14
Which gas law is also known as the combined gas law?
Ideal gas law
ExplanationThe ideal gas law incorporates Boyle's, Charles's, and Gay-Lussac's laws.
#15
Which gas law describes the behavior of real gases at high pressures and low temperatures?
Van der Waals equation
ExplanationVan der Waals equation adjusts for real gas behavior by considering the volume of gas molecules and intermolecular forces.