General Chemistry Chapter 6 Notes
General Chemistry Chapter 6 Notes Chem 222
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This 2 page Class Notes was uploaded by Haley Notetaker on Tuesday January 19, 2016. The Class Notes belongs to Chem 222 at Portland State University taught by Dr. Eric Sheagley in Winter 2016. Since its upload, it has received 42 views. For similar materials see General Chemistry in Chemistry at Portland State University.
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Date Created: 01/19/16
Thermochemistry Chapter 6 Tuesday, January 19, 2016 2:49 PM Law of thermodynamics: Energy is conserved; the total energy change in the system and the surroundings is 0. Euniverse = E system-Esurroundings o System= thing being studied o Surroundings = everything else qsys= -qsurr Reaction Types Exothermic Reactions - when the system loses heat energy and work is being done on the surroundings Esystems less than 0 (negative value) Esurroundingsreater than 0 (positive value) o If the initial temperature is lower than the final temperature then the reaction is exothermic Endothermic Reactions - when the system gains heat energy and work is being done on the system Esystems more than 0 (positive value) Esurroundingsess than 0 (negative value) o If the initial temperature is greater than the final temperature then the reaction is endothermic Work= Force (in Newtons) * distance (in meters)- F*d Pressure= Force / Area - F/A Force= Pressure * Area- F= P*A meaning……. Work (w) = P*A*d Specific Heat Capacity (C s Units= J/ g ̊ the amount of heat energy required to raise the temperature of one gram of a substance 1°C o Intrinsic ability to absorb heat Molar Heat Capacity Example on how to use Specific Heat Capacity to find the heat of a reaction: mass= 3.10 g T= T f T i-->[37 ̊C-(-8.0 ̊C)]= 45.0 ̊ C sf copper= 0.385 J/g ̊C q= m* C *sT ----> 3.10g(0.385J/g ̊C)(45.0 ̊C)= 53.7 J Because the result was a positive number the reaction was endothermic More on Work Work is calculated by multiplying the external pressure by the change in Volume o W= -P* V As a gas expands the change in Volume will increase but the energy of work will be negative because work is being done by the system on the surroundings. Enthalpy Sum of the internal energy of a system and the product of pressure and volume o H° reaction n °fproducts) - n °freactants) means sum n = coefficient of the reaction Enthalpy is a state function o State Function = value of the function is dependent on the state of that system; not how it arrived to that state.
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