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FSU - CHM 1046 - CHM 1046 EXAM IV Study guide - Study Guide

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FSU - CHM 1046 - CHM 1046 EXAM IV Study guide - Study Guide

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background image CHM 1046 Exam IV Study Guide  Thermodynamics
Spontaneity: is when a reaction happen without a driving force.
A reaction is spontaneous when:
● Delta G is negative  ● E cell potential is positive ● The reaction can be endothermic or exothermic Entropy (Delta S): the measure of disorder. ● Whenever a system is highly disorder, entropy is positive ● Entropy increase from solid to liquid to gas ● Entropy increase at lower pressure ● Entropy is calculated by using a delta S table value of each molecules ● Delta S= Sum of product ­ Sum of reactant ● The second law of thermodynamic: spontaneous process happen when  entropy of the universe is positive ● Delta S of the Universe= Delta S of the System ­ Delta S of the surrounding.
­ Delta S of surrounding = ­ Delta H of the system/ T
Example: 1. AgCl(s) ­­­­­­ Ag+  + Cl­   
­ Entropy is positive because the reaction went from a solid to two aqueous 
ions. 2. CO2 (g) or CO2 (s) ­ CO2 (g) has a higher positive because gas molecule is more disorder than  solid. To determine at which temperature a system is spontaneous
                     T= delta H/ delta S
Gibbs free energy: energy that is used to do work. 
background image ●  Delta G= Delta H­ T Delta S ● At equilibrium: Delta G= ­RTLn(K) Electrochemistry:
Oxidation: the loss of electron and increase in charge
Reduction: the gain of electron and decrease in charge
Oxidation number
1. Oxygen always ­2 except in peroxide
2. Hydrogen +1
3. Halogen always ­1
4. Group 1 metal +1
5. Group 2 metal +2 
6. Elements 0
7. Neutral compound, the sum of oxidation number always equal to 0
8. For ionic compound, the sum of oxidation number always equal to the 
charge of the compound Galvanic cell:
Anode: where oxidation occurs
Cathode: where the reduction occurs
Electrons flow from the anode to the cathode
Salt Bridge: used to maintain charge balance during the reaction
Cell potential: used to measure the amount of voltage used during a reaction 
(Unit= V)
Cell Notation:
● Single line is used to represent phase boundary ● Double line is used to represent the salt bridge Calculating Cell potential ­ E Cell= Reduction ­ Oxidation
­ The value is obtained from the Reduction potential Table

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School: Florida State University
Department: Chemistry
Course: Gen Chemistry II
Professor: B. Deprince
Term: Fall 2016
Tags: Thermodynamics, Electrochemistry, and Gibbs Free Energy
Name: CHM 1046 EXAM IV Study guide
Description: This is the study for Exam IV. It covers Thermodynamics and Electrochemistry.
Uploaded: 04/18/2018
3 Pages 40 Views 32 Unlocks
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