AP Chemistry Questions on Charles's Law

📚 Quick Study Guide

• 🌡️ Charles's Law describes how gases tend to expand when heated. A gas's volume is directly proportional to its absolute temperature when pressure and the amount of gas are kept constant.
• 📝 The formula for Charles's Law is: $\frac{V_1}{T_1} = \frac{V_2}{T_2}$, where:
  • $V_1$ = Initial Volume
  • $T_1$ = Initial Temperature (in Kelvin)
  • $V_2$ = Final Volume
  • $T_2$ = Final Temperature (in Kelvin)
• ➗ Remember to ALWAYS convert temperatures to Kelvin before using the formula. $K = °C + 273.15$
• 💡 Charles's Law is a special case of the Ideal Gas Law where the number of moles and pressure are constant.
• 🧪 This law assumes ideal gas behavior. Real gases may deviate at very high pressures or low temperatures.

🧪 Practice Quiz

1. A balloon has a volume of 3.0 L at 27°C. If the temperature is increased to 227°C, what is the new volume of the balloon, assuming the pressure remains constant?
   1. 1.0 L
   2. 5.0 L
   3. 7.0 L
   4. 9.0 L
2. A gas occupies 10.0 L at standard temperature (273 K). If the temperature is doubled, what is the new volume, assuming constant pressure?
   1. 5.0 L
   2. 10.0 L
   3. 20.0 L
   4. 40.0 L
3. A container of gas has a volume of 5.0 L at 20°C. What temperature is needed to expand the volume to 7.5 L, assuming constant pressure?
   1. 10°C
   2. 30°C
   3. 170.5°C
   4. 473°C
4. If a gas has a volume of 2.0 L at 300 K, what would its volume be at 150 K, assuming constant pressure?
   1. 1.0 L
   2. 2.0 L
   3. 3.0 L
   4. 4.0 L
5. A balloon is filled with 6.0 L of air at 25°C. If the balloon is placed in a freezer at -15°C, what is the new volume of the balloon, assuming the pressure remains constant?
   1. 4.8 L
   2. 6.0 L
   3. 7.5 L
   4. 9.0 L
6. What is the relationship between volume and temperature in Charles's Law?
   1. Directly proportional
   2. Inversely proportional
   3. Exponential
   4. No relationship
7. A gas occupies a volume of 4.0 L at 127°C. At what temperature will the gas occupy a volume of 8.0 L, assuming constant pressure?
   1. 63.5 °C
   2. 254 °C
   3. 400 °C
   4. 527 °C