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

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

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

Dalton’s Law Pressure exerted by a gaseous mixture= Sum of partial pressures of particles P total= P 1 + P 2 + ::: + 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)

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….

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

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