1. By Spencer Hansen and Mitch Mitchell
Dalton’s Law
By Spencer Hansen and Mitch Mitchell

2. Mr. John Dalton Born September 6, 1766
Moved to Manchester, became teacher of Philosophy
First was an English Meteorologist
Switched to Chemistry later on in life
Creator of Atomic Theory
Researched Color Blindness
Later became private teacher of Mathematics/Chemistry
Died July 27, 1844

3. Dalton’s Atomic Theory
Elements are made of particles called atoms
Atoms of a given element are identical
Atoms of one elements, different from others
Atoms of different elements can form compounds
Those compounds have same makeup
Atoms cannot be divided, or destroyed
Chemical reactions only change way of formation

4. Dalton’s Law Pressure exerted by a gaseous mixture=
Sum of partial pressures of particles
P total= P P ::: + P n
P= Partial Pressures of each component
Assumed that gases don’t react with each other
Discovered this law in 1801
Related to Ideal Gas Laws (PV=nRT=NkT)

5. Example:
If you have 2 different gases: nitrogen/oxygen, their partial pressures will equal the pressure of the gaseous mixture
P = Pnitrogen + Poxygen
P = pressure of gaseous mixture, Pnitrogen = partial pressure of nitrogen, Poxygen = partial pressure of oxygen
Continued on next slide….

6. Cont…. Shows that each balloon has their own partial pressures
When you remove stopcock, both gases mix
When both mix, they equal the total pressure exerted
NITROGEN
STOPCOCK
OXYGEN

7. THE END