Properties of Gases
What is standard temperature in Kelvin?
273
What variable is held constant when using Boyle's Law?
Temperature
What variable is held constant when using Charles' Law?
Pressure
What variable is held constant when using Gay-Lussac's Law?
Volume
What is standard pressure in atm?
1 atm
What is the equation for Boyle's law?
What is the equation for Charles' Law?
V1/T1 = V2/T2 or V1T2 = V2T1
What is the equation for Gay-Lussac's Law?
P1/T1 = P2/T2 or P1T2 = P2T1
When temperature is constant, what happens to volume when the pressure decreases?
Volume Increases
1.7 L of gas is collected at 1.2 atm. What volume does the gas occupy if the pressure changes to 0.7 atm? Temperature is constant.
2.9L
A gas is collected at 0oC and occupies 5.0 L. What is the gas volume at 40oC if pressure remains constant?
5.7L
Oxygen gas in a sealed container was measure to a temperature of 18oC and a pressure of 3.0 atm. At what temperature will the pressure reach 3.5 atm? Assume constant volume and leave your final answer in Kelvin.
339.5 K
When pressure is held constant, what happens to the volume when temperature increases?
It increases
A sample of nitrogen gas occupies 350mL at 1.3 atm. If the volume of the gas decreases to 150mL, what will the new pressure be? Assume constant temperature.
3.0 atm
If 640mL of helium is measure at 44oC, what will temperature the gas be at a volume of 260mL? Assume constant pressure and keep your final answer in Kelvin.
128.8 K
Carbon Dioxide gas in a sealed container was measured to a temperature of -2oC and a pressure of 420 mm Hg. What will the new pressure be if the tempurature drops to -21oC Assume constant volume.
390.6 mm Hg
Tom Brady is trying to defend himself from deflategate. He is being accused by the NFL of deflating footballs from their standard pressure in playoff games for his advantage. Before the game, footballs are kept inside a warm closet in the Patriots' locker room. How might Tom Brady use his knowledge of chemistry gas laws to explain to the NFL why the footballs seemed deflated during their recent win on a cold January Sunday?
According to Gay-Lussac's law, the relationship between temperature and pressure are directly related. As the temperature dropped, the air pressure inside the football automatically dropped too because when temperature decreases, pressure decreases.
23.7 ml of gas is collected at standard pressure. What volume does the gas occupy if the pressure changes to 864 mmHg? Temperature is constant.
20.8ml
A gas is collected at 13oC and occupies 340.0 ml. What is the gas volume at standard temperature if pressure remains constant?
324.5 mL
Krypton gas in a sealed container was measured to a temperature of -15 oC and a pressure of 0.55 atm. What will the new temperature be at standard pressure? Assume constant volume and keep your final answer in Kelvin
469.1 K