CH301H - Principles of Chemistry I: Honors
Fall 2013, Unique 52195

Lecture Summary, 15 November 2013

Ideal Gasses: Today we started talking about ideal gasses.  Ideal gasses are defined as noninteracting point spheres that are arranged such that the distance between molecules is much larger than the size of an individual molecule, and collisions between molecules are rare, but when they do occur they are perfectly elastic.  We performed thought experiments to derive Boyles' law, Charles' law, and the ideal gas (or sometimes called "perfect gas") law:


This is our first example of a "state" function; i.e. a relationship that depends only on the properties of a state, not on how the state acquired those properties.

Because there is no chemical information in our definition of an ideal gas (it is a noninteracting point sphere), this state function applies both to pure species and mixtures of different species.  This is Dalton's law: an ideal gas behaves the same if it is composed of one type of atom or molecule, or mixtures of atoms or molecules.