Kinetic Molecular Theory of GASES
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1 Kinetic Molecular Theory of GASES
2 Kinetic Theory is based on two ideas: 1) Particles of matter are always in motion 2) This motion has consequences (Properties) Kinetic Molecular Theory
3 PROPERTIES OF GASES
4 1) Expansion (Expands) No definite shape or volume 2) Fluidity (Fluid) Gas particles glide easily past one another Physical Properties of Gases
5 3) Low Density The density of a substance in the gaseous state is about 1/1000 the density of the same substance in the liquid or solid state Physical Properties of Gases
6 4) Compressibility (Highly Compressible) During compression of a gas, gas particles are crowded close together With sufficient compression, the volume of a gas can be decreased thousands of times Physical Properties of Gases
7 5) Diffusion/Effusion Diffusion = spontaneous mixing of the particles of two substances without being stirred Rate of diffusion depends on: - Speed of gas particles (Higher speed = Faster diffusion) - Diameter of gas particles (Smaller = Faster Diffusion) - Attraction Force between gas particles (Small attraction = Faster diffusion) Physical Properties of Gases
8 5) Diffusion/Effusion Effusion = gas particles under pressure pass through a very small opening from one container to another Rates of effusion is directly proportional to velocity of particles (Faster particles = faster effusion) Physical Properties of Gases
9 Kinetic Molecular Theory (KMT) explains WHY gases have these properties. Kinetic Molecular Theory states five assumptions Kinetic Molecular Theory
10 Assumption # 1 Gases consist of large numbers of tiny particles that are far apart relative to their size - Most of the volume occupied by a gas is empty space Kinetic Molecular Theory
11 Assumption # 2 Particles of a gas are in constant, rapid & random motion therefore possessing Thermal Energy Thermal energy = energy of random motion Kinetic Molecular Theory
12 Assumption # 3 Collisions between particles of a gas and between particles & container walls are elastic collisions - Elastic collisions = no net loss or gain of thermal energy Kinetic Molecular Theory
13 Assumption # 4 There are no forces of attraction or repulsion between the particles of a gas - They do not stick together but immediately bounce off of each other like billiard balls Kinetic Molecular Theory
14 Assumption # 5 The average thermal energy of the particles of a gas depends on the temperature - If temperature goes up, E th goes up (direct proportion) E th = ½ mv 2 m = mass v = velocity If same gas, mass is the same therefore E th depends on velocity With different gases, low mass means higher average speeds Kinetic Molecular Theory
15 Using Kinetic Molecular Theory to EXPLAIN properties Explaining Properties
16 1) Gases Expand because - #2 Particles are in constant, random motion - #4 There are no attractive forces between particles 2) Gases act like Fluids because - #4 There are no attractive forces between particles Explaining Properties
17 3) Gases have a low density because -#1 Gases consist of tiny particles that are far apart - #4 There are no attractive forces between particles Explaining Properties
18 4) Gases are highly compressible because -#1 Gases consist of tiny particles that are far apart Explaining Properties
19 5) Gases diffuse & effuse because - #2 Particles are in constant, random motion Explaining Properties
20 Ideal Gas = imaginary gas that conforms perfectly to all assumptions of the Kinetic Molecular Theory Real Gas = a gas that does not completely obey all the assumptions of the Kinetic Molecular Theory (KMT) Ideal Versus Real Gases
21 Real gases deviate from ideal gases because 1) Particles of real gases occupy space 2) Particles of real gases exert attractive forces on each other Real gases behave like ideal gases when.. 1) Particles are very far apart 2) Particles have high thermal energies 3) Particles have a weak attraction to each other Ideal Versus Real Gases
22 Measureable quantities of gases: 1) Volume 2) Temperature 3) Pressure 4) Quantity or number of moles Describe the volume, temperature & pressure needed for a gas to a) Act most like an ideal gas b) Deviate the most from an ideal gas Ideal Versus Real Gases
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