Lesson 6 The Molecular Nature and Gas Pressure PDF - Lesson...

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Lesson 6: Gas Pressure and the Kinetic Molecular TheoryObjectives: By the end of today’s class you will be able to use the ideal gas law to derive an expression for gas pressure based on the molecular nature of gas.
States of MatterWhat are some differences between states of matter, i.e. solid, liquid & gas?
A postulate is the scientific term for a basic assumption used to derive some theoretical model.Postulate 1: A gasis composed of a very large number of molecules.Postulate 2: These molecules are separated by a large distance relative to their own size.Postulatesof the kinetic-molecular theory of gases:
Postulate 3: A gas is composed of a large number of molecules in ceaseless motion.What everyday experience provides some justification for this postulate?
Molecular SpeedsIs it possible for all molecules to travel at the same speed?Assume that all molecules initially travel at the same speed, will they continue to travel at the same speed?
Distribution of Molecular Speedsum: most probable speeduav: average speedurms: root-mean-square speedHydrogen gas at 0 °Cp218-221 Petrucci et. al.
Distribution of Molecular Speeds

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