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CHEM 112 week 4 notes

by: Olivia Lee

CHEM 112 week 4 notes CHEM 112000

Marketplace > Purdue University > Chemistry > CHEM 112000 > CHEM 112 week 4 notes
Olivia Lee
GPA 3.65

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week 4
Class Notes
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This 3 page Class Notes was uploaded by Olivia Lee on Monday February 1, 2016. The Class Notes belongs to CHEM 112000 at Purdue University taught by Abu-Omar in Winter 2016. Since its upload, it has received 9 views. For similar materials see Chemistry in Chemistry at Purdue University.


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Date Created: 02/01/16
nd CHEM 112 1 Edition Lecture 4 Outline of Last Lecture I. Ideal Gas Law II. Dalton’s Law III. Kinetic-Molecular Theory of Gasses Outline of Current Lecture I. Liquid-Gas Phase Changes II. Boiling Point III. Liquid-Solid Phase Changes IV. Solid-Gas Phase Changes V. Heating & Cooling Curves Current Lecture  Liquid-Gas Phase Changes o Evaporation or vaporization  Evaporation occurs because some surface liquid molecules have high enough kinetic energy to escape to the gas phase.  Heat is required to maintain the temperature needed for evaporation  Endothermic  Does not break bonds, just changes physical state o Condensation  Transition from a gas phase to a liquid  Occurs when gas particles cannot escape the container and this, come into contact with a liquid  An exothermic process These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. o Equilibrium: a state in which opposing processes occur at equal rates. o Liquid-Vapor Equilibrium  A liquid placed in a closed container will evaporate only until equilibrium is reached.  The pressure exerted by the vapor at equilibrium is the vapor pressure.  Boiling Point o Boiling occurs when the vapor pressure equals the external pressure of the atmosphere o The temperature at which vapor pressure equals the external pressure of the atmosphere is the boiling point o If the external pressure is exactly 1 atm, the boiling temperature is called the normal boiling point  ACTIVITY  Consider the vapor pressure curve for propane to the left, which is used as a fuel in barbeque grills.  What is the normal boiling point for propane? o Around -48 degrees Celcius (look at where the graph equals 1 atm)  Liquid-Solid Phase Changes o Temperature which the liquid and solid states coexist in equilibrium called the freezing point or the melting point  Solid-Gas Phase Changes o Under certain conditions, substances can go directly from the solid state to the gas state: sublimation. CO2 and I2 do this under normal conditions. o Deposition is a direct transition from gas to solid. Reverse of sublimation.  Cooling and Heating Curves o Show the phase changes of a substance as heat is removed or added at a constant pressure o Cooling curve: heat it removed o Heating Curve: heat is added


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