Gas Laws
Gas Laws
First, Definitions
Directly proportional both variables will either increase or decrease
together
Inversely proportional one variable will increase and the other
variable will decrease
Do you have these definitions on your unit plan?
Temperature held constant?
What happens if the temperature is held constant?
As the volume decreases, what happens to the pressure?
It increases
Directly or Inversely Proportional?
Inversely
Pressure held constant?
What happens when the pressure is held constant?
As the volume decreases, what happens to the temperature?
It decreases
Directly or Inversely Proportional?
Directly
Volume held constant?
What happens when the volume is held constant?
As the temperature increases, what happens to the pressure?It increases
Directly or Inversely Proportional?
Directly
Boyle’s Law
Robert Boyle Studied relationship between
pressure and volume when temperature was constant
Determined
they were
inversely
proportional
Charles’ Law
Jacques Charles Studied relationship between volume and
temperature when pressure is held constant Determined they were directly proportional
Gay-Lussac’s Law
Joseph Gay-Lussac Studied relationship between
pressure and temperature when volume is held constant
Determined
they were
directly
proportional
Ideal vs. Real Gas
Ideal gases are gases whose particles take up no space and have no intermolecular attractive forces
Can you give an example of an ideal gas?Probably not….they do not exist in the
real world!Expressed by the question PV = nRT
Do you have these definitions on your unit plan?
Ideal vs. Real Gas
Real gases are gases whose particles take up space and have intermolecular attractive forces
Do you have these definitions on your unit plan?