Kinetic Molecular Theory

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Phases & Changes in States of Matter : 

Phases & Changes in States of Matter Kinetic Molecular Theory & Ideal Gases vs. Real Gases

Kinetic Nature of Matter : 

Kinetic Nature of Matter Kinetic → “motion” Kinetic Theory explains the effects of temperature and pressure on matter

3 Assumptions of Kinetic Theory : 

3 Assumptions of Kinetic Theory All matter is made of tiny particles called atoms These atoms are in constant motion Brownian motion (random motion) Each particle has kinetic energy Collisions between particles are perfectly elastic.

Perfectly Elastic Collisions : 

Perfectly Elastic Collisions KE = 7 KE = 3 KE = 2 KE = 8 Total Kinetic Energy Before the collision: 10 Total Kinetic Energy After the collision: 10 Collision is perfectly elastic; No kinetic energy is lost overall

Kinetic Molecular Theory &Ideal Gases : 

Kinetic Molecular Theory &Ideal Gases Particles in a gas are spread out In an Ideal Gas, particles are considered to be single points (zero volume) Particles do have volume, but negligible compared to overall gas volume In an Ideal Gas, no attraction between particles Attraction is present, but ignored for an Ideal Gas

Slide 6: 

Particles collide with each other and the walls of the container Collision with walls of container creates pressure Particles in a gas do not all have identical energy Average kinetic energy of particles is measured by the gas temperature