Gas Law Basics
What does Gay-Lussac’s Law describe the relationship between?
Pressure and Temperature
What does KMT stand for?
Kinetic Molecular Theory
Convert 25°C to Kelvin.
25+273.15=298.15(K)
What graph proves Gay-Lussac’s Law?
Pressure vs. Temperature (K) — straight line
In the Candle in Water experiment, what happened to the water level inside the glass?
The water level rises.
How does pressure change with temperature at constant volume?
Increases proportionally with temperature in Kelvin.
What happens to the motion of gas particles when temperature increases?
They move faster
A gas was heated and the pressure doubled. If the final temperature is 400 K, what was the initial temperature?
200K
What is the danger of heating a sealed gas tank?
Pressure builds up and may cause explosion
Why the water level inside the glass rapidly change right after the candle is extinguished?
The air inside the glass cools quickly after the flame goes out, causing the pressure to drop. The higher outside air pressure pushes the water up into the glass.
What is the variable must remain constant for Gay-Lussac’s Law to apply?
Volume of Gas
How does increased particle motion affect pressure?
More frequent and forceful collisions with walls
A gas sample at 120 kPa and 270 K. It is heated until it reaches a pressure of 180 kPa. What is the temperature in °C?
131.85°C
How does Gay-Lussac’s Law apply to cooking in a pressure cooker?
Higher temperature increases pressure, cooking faster
Why does the water stop rising at a certain point?
Because pressure inside equals external pressure, it reached the equilibrium.
What happens to pressure if temperature is doubled (in Kelvin)?
It doubles
Why does volume need to stay constant in Gay-Lussac’s Law experiments?
To isolate the pressure-temperature relationship
A graph of Pressure vs. Temperature (Kelvin) for a fixed-volume gas shows a straight line passing through (300K, 100 kPa) and (600K, x). Determine the value of x and estimate the pressure at 450K.
x=200K, P=150kPa