- Which gas law combines Charles’s Law and Boyle’s Law?
A) Avogadro’s Law
B) Ideal Gas Law
C) Gay-Lussac’s Law
D) Dalton’s Law
Answer: B) Ideal Gas Law
Explanation: The Ideal Gas Law combines the principles of Charles’s Law, Boyle’s Law, and Avogadro’s Law into a single equation.
- What does the term “ideal gas” imply?
A) The gas has a fixed volume.
B) The gas follows the Ideal Gas Equation at all conditions.
C) The gas particles have negligible volume and do not interact.
D) The gas exists only at high pressures.
Answer: C) The gas particles have negligible volume and do not interact.
Explanation: An ideal gas is defined as a hypothetical gas whose particles do not exert forces on each other and occupy no volume.
- At which point do real gases behave similarly to ideal gases?
A) At high pressures
B) At low temperatures
C) At high temperatures and low pressures
D) At low volumes
Answer: C) At high temperatures and low pressures
Explanation: Real gases behave more like ideal gases under conditions of high temperature and low pressure.
- Which of the following is NOT a characteristic of an ideal gas?
A) No intermolecular forces
B) Gas particles occupy space
C) Constant temperature during expansion
D) Elastic collisions
Answer: B) Gas particles occupy space
Explanation: While all gases occupy space, ideal gas behavior assumes that the volume of gas particles is negligible compared to the volume of the container.
- If the temperature of a gas is tripled while keeping pressure constant, what happens to the volume?
A) It halves
B) It remains constant
C) It triples
D) It quadruples
Answer: C) It triples
Explanation: According to Charles’s Law, volume is directly proportional to temperature at constant pressure. If temperature increases, volume increases accordingly.
- What is the value of R when using liters, atmospheres, moles, and Kelvin?
A) 0.0821 L·atm/(mol·K)
B) 8.314 J/(mol·K)
C) 0.0831 L·bar/(mol·K)
D) 1.987 cal/(mol·K)
Answer: A) 0.0821 L·atm/(mol·K)
Explanation: This is the value of the ideal gas constant when using these specific units.
- Which law states that the volume of a fixed amount of gas is directly proportional to its absolute temperature at constant pressure?
A) Boyle’s Law
B) Charles’s Law
C) Avogadro’s Law
D) Gay-Lussac’s Law
Answer: B) Charles’s Law
Explanation: Charles’s Law describes the direct relationship between the volume and temperature of a gas at constant pressure.
- If a gas expands in volume while maintaining constant temperature, what happens to the pressure?
A) Pressure increases
B) Pressure decreases
C) Pressure remains constant
D) Pressure fluctuates
Answer: B) Pressure decreases
Explanation: According to Boyle’s Law, if the volume of a gas increases at constant temperature, the pressure must decrease.
- What is the standard temperature and pressure (STP) for gases?
A) 0 °C and 1 atm
B) 25 °C and 1 atm
C) 0 K and 1 bar
D) 100 °C and 1 atm
Answer: A) 0 °C and 1 atm
Explanation: STP is defined as 0 °C (273.15 K) and 1 atm of pressure.
- Which of the following changes would increase the kinetic energy of gas molecules?
A) Increasing the volume
B) Increasing the temperature
C) Decreasing the pressure
D) Decreasing the number of moles
Answer: B) Increasing the temperature
Explanation: The kinetic energy of gas molecules is directly proportional to the temperature; increasing the temperature increases kinetic energy.
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