Lecture_20_110311 - Lecture 20: Gases Goals: Describe the...

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Lecture 20: Gases Goals: Describe the kinetic molecular theory of gases and the properties of gases. Learn the units of measurement used for pressure and how to convert from one unit to another. Use Boyle’s law to determine the pressure or volume of a certain amount of gas at a constant pressure. Outline (Timberlake 7.1-7.4): ± Properties of Gases (7.1) ± Gas Pressure (7.2) ± Pressure and Volume (7.3) ± Temperature and Volume (7.4) Problems for Extra Practice: 7.1, 7.3, 7.5, 7.7, 7.9, 7.11, 7.13, 7.15, 7.17, 7.19, 7.23, 7.25, 7.27
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Energy Changes in Chemical Reactions Reaction Energy Heat Sign of Type Change in Reaction H Endothermic Heat absorbed Reactant side + Exothermic Heat released Product side
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Calculations Using Heat of Reaction ( Δ H )
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Calculations Using Heat of Reaction ( Δ H ) In the reaction N 2 ( g ) + O 2 ( g ) 2NO( g ), H = 180 kJ. If 15.0 g of NO are produced, how many kJ were absorbed? – Step 1: Given: 15.0 g of NO produced H = 180 kJ/2 moles of NO Need: kJ absorbed – Step 2: Plan: g of NO b moles of NO b kJ – Step 3: Write the conversion factors: 2 moles NO = 180 kJ 1 mole NO = 30.0 g of NO – Step 4: Set up the problem to calculate kJ:
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Learning Check How many grams of O 2 reacted if 306 kcal are released in the following reaction? CH 4 ( g ) + 2O 2 ( g ) CO 2 ( g ) + 2H 2 O( l ) + 213 kcal 1) 91.9 g of O 2 2) 46.0 g of O 2 3) 2.87 g of O 2
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Helium He 4.0 Neon Ne 20.2 Argon Ar 39.9 Hydrogen H 2 2.0 Nitrogen N 2 28.0 Nitrogen Monoxide NO 30.0 Oxygen O 2 32.0 Hydrogen Chloride HCl 36.5 Ozone O 3 48.0 Ammonia NH 3 17.0 Methane CH 4 16.0 Substances that are Gases under Normal Conditions Substance Formula MM (g/mol)
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Kinetic Theory of Gases A gas consists of small particles that • move rapidly in straight lines • have essentially no attractive (or
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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_20_110311 - Lecture 20: Gases Goals: Describe the...

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