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Unit 3: Kinetic Molecular Theory and States of Matter

Unit 3: Kinetic Molecular Theory and States of Matter. Gases and Their Behavior Day 3. Gases and Their Behavior, Day 2. Kinetic Molecular Theory of Ideal Gases:. P, V, and T are all macroscopic properties of gases. What are gases like on the atomic scale ?.

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Unit 3: Kinetic Molecular Theory and States of Matter

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  1. Unit 3: Kinetic Molecular Theory and States of Matter Gases and Their Behavior Day 3

  2. Gases and Their Behavior, Day 2 Kinetic Molecular Theory of Ideal Gases: P, V, and T are all macroscopic properties of gases. What are gases like on the atomic scale? 1. The separation of gas particles is much greater than the size of the particles themselves. (between them there is empty space) 2. Particles are in continual, random and rapid motion. They collide elastically with each other and the container, but never lose energy 3. All gases, regardless of molecular mass, have the same average kinetic energy at the same temperature. *** A helium atom has relatively the same space to move around in as a pea would inside of a basketball….

  3. Gases and Their Behavior, Day 2 Molecular Speed and Kinetic Energy: Not all molecules in a gas move at the same speed. There is a distribution of speeds. O2 gas

  4. Gases and Their Behavior, Day 2 Calculations with Molecular speed: 1. Kinetic energy of a single gas molecule - 2. Average kinetic energy of an entire gas sample - 3. Average kinetic energy of a sample if you know the …

  5. Gases and Their Behavior, Day 2 Maxwells Equation: Root mean square speed, or rms speed Calculate the rms speed of oxygen molecules at 25oC. KMT says: ALL gases have the same average KE at a given temp. This graph shows different speed distributions. WHY?

  6. Gases and Their Behavior, Day 2 Non-Ideal Behavior (Real gases): Do we generally assume that gases have any intermolecular forces? At room temp and 1 atm, the general gas laws are very good at predicting P,V,T behavior. This is not always the case. van der Waals Equation:

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