Lecture_22_110811

# Lecture_22_110811 - Lecture 22: Gas Laws Goals: Examine the...

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Lecture 22: Gas Laws Goals: Examine the relationship between temperature and volume and between temperature and pressure. Use the combined gas law to find the new pressure, volume or temperature when changes in two of these properties are given. Outline (Timberlake 7.4-7.7): ± Temperature and Volume (7.4) ± Temperature and Pressure (7.5) ± The Combined Gas Law (7.6) ± Volume and Moles (7.7) Problems for Extra Practice: 7.23, 7.25, 7.27, 7.31, 7.33, 7.35, 7.37, 7.39, 7.41, 7.45, 7.47, 7.49

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Properties of Gases • Gases are described in terms of four properties: pressure ( P ), volume ( V ), temperature ( T ), and amount ( n ).
Boyle’s Law Boyle’s law states that • the pressure of a gas is inversely related to its volume when T and n are constant • if the pressure ( P ) increases, then the volume ( V ) decreases P 1 V 1 = P 2 V 2

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Charles’s Law In Charles’s law , • the Kelvin temperature of a gas is directly related to the volume P and n are constant • when the temperature of a gas increases, its volume increases
• For two conditions, Charles’s law is written V 1 = V 2 ( P and n constant) T 1 T 2 • Rearranging Charles’s law to solve for V 2 gives T 2 x V 1 = V 2 x T 2 T 1 T 2 V 2 = V 1 x T 2 T 1 Charles’s Law: V and T

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Learning Check Solve Charles’s law expression for T 2 . V 1 = V 2 T 1 T 2
temperature drops to 0 °C, what is the new volume of the balloon ( P constant)? Calculations Using Charles’s Law

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## This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Lecture_22_110811 - Lecture 22: Gas Laws Goals: Examine the...

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