Chapter 11.docx - 1 Chapter 12 notes Chapter 11 Gases Physical Properties of Gases 1 Gases have no definite shape or volume They will expand to fill any

Chapter 11.docx - 1 Chapter 12 notes Chapter 11 Gases...

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1 Chapter 12 notes Chapter 11 Gases Physical Properties of Gases 1) Gases have no definite shape or volume. They will expand to fill any container (expand infinitely) 2) Gases are highly compressible. 3) Gases have low densities (especially compared to liquids and solids) 4) Gases in a closed container exert uniform pressure on all walls. 5) Gases mix spontaneously and completely with each other at constant pressure (diffusion). The Kinetic Molecular Theory 1) Gas particles move continuously, rapidly, randomly in straight lines, and in all directions. 2) Gas particles are tiny and the distances between them are great. 3) For gases, both gravitational forces and forces of attraction between gas particles are negligible. 4) When gas particles collide with one another, or with the walls of the container, no energy is lost (perfectly elastic collisions). 5) The average kinetic energy is the same for all gases at the same temperature; it varies with the temperature in kelvins. Atmospheric Pressure Pressure is the force per unit area. Pressure is the result of the constant collisions between the atoms or molecules in the gas and the surfaces around them. The atmospheric pressure
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