Chapter 10: Gases

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26 Terms

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Physical properties of gases

All similar characteristics that gases share.

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Common gases examples

Oxygen (Oā‚‚), Nitrogen (Nā‚‚), Carbon Dioxide (COā‚‚), Methane (CHā‚„).

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Behavior of gases compared to liquids and solids

Gases expand to fill their containers, are highly compressible, and have extremely low densities.

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Pressure (P)

The amount of force applied to an area.

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Pressure formula

P = F/A

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Atmospheric pressure

The weight of air per unit of area.

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Units of pressure

Pascals, Bar, mm Hg or torr, Atmosphere.

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Standard atmospheric pressure (STP)

1 atm, 760 torr (760 mmHg), 101.325 kPa.

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Boyleā€™s Law

The volume of a fixed quantity of gas at constant pressure is inversely proportional to the pressure.

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Charleā€™s Law

The volume of a fixed amount of gas at constant pressure is directly proportional to its absolute temperature.

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Gay-Lussacā€™s Law

At a given temperature and pressure, the volume of gases that react with each other is in small whole numbers.

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Combined Gas Law formula

(P1V1)/T1 = (P2V2)/T2

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Avogadroā€™s Law

The volume of a gas at constant temperature and pressure is directly proportional to the number of moles of gas.

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Ideal-Gas Law

PV = nRT, where n is the number of moles of gas and R is the ideal gas constant.

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Ideal gas constant (R)

0.08206 LĀ·atm/(molĀ·K).

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Density of gases formula

d = MP / RT.

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Daltonā€™s Law of Partial Pressure

The total pressure of a mixture of gases equals the sum of the pressures each would exert alone.

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Mole fraction formula

x1 = n1/nt.

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Kinetic-Molecular Theory main tenets

Gases consist of moving molecules, low attractive forces, and energy is transferred in collisions.

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Average kinetic energy of molecules

Proportional to the absolute temperature.

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Effusion

Escape of gas molecules through a tiny hole.

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Diffusion

Spread of one substance throughout space or another substance.

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Grahamā€™s Law

Describes the relationship of gas molar mass to diffusion and effusion rates.

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Real gases behavior

Conforms to ideal-gas equation only at high temperatures and low pressures.

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van der Waals equation

Accounts for deviations from ideal gas behavior: P = [nRT / (V - nb)] - [a(n/V)Ā²].

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Corrections for non-ideal behavior

Account for molecular attraction and volume occupied by gas molecules.