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Unit 6: Gases and Gas Laws. Particles of matter are ALWAYS in motion Volume of individual particles is  zero. Collisions of particles with container walls cause pressure exerted by gas. Particles exert no forces on each other.

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Presentation Transcript
kinetic molecular theory
Particles of matter are ALWAYS in motion

Volume of individual particles is  zero.

Collisions of particles with container walls cause pressure exerted by gas.

Particles exert no forces on each other.

Average kinetic energy µ Kelvin temperature of a gas.

Kinetic Molecular Theory
the nature of gases
Gases expand to fill their containers

Gases are fluid – they flow

Gases have low density

1/1000 the density of the equivalent liquid or solid

Gases are compressible

Gases effuse and diffuse

The Nature of Gases
standard temperature and pressure stp
P = 1 atmosphere, 760 torr, 101.3 kPa

T = 0°C, 273 Kelvins

The molar volume of an ideal gas is 22.42 liters at STP

Standard Temperature and Pressure“STP”
boyle s law
Boyle’s Law

Pressure is inversely proportional to volume

when temperature is held constant.

charles s law
The volume of a gas is directly proportional to temperature, and extrapolates to zero at zero Kelvin.

(P = constant)

Charles’s Law

Temperature MUST be in KELVINS!

gay lussac s law
Gay Lussac’s Law

The pressure and temperature of a gas are

directly related, provided that the volume

remains constant.

Temperature MUST be in KELVINS!

the combined gas law
The Combined Gas Law

The combined gas law expresses the relationship between pressure, volume and temperature of a fixed amount of gas.

Boyle’s law, Gay-Lussac’s law, and Charles’ law are all derived from this by holding a variable constant.