Chapter 9 - Lecture notes 9 PDF

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Summary

ninth...

Description

Redox reduction (gain electron) and oxidation (lose electron) -

Have to be able to assign oxidation numbers

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Have to be able to identify what is being reduced/oxidized

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X is being reduced (it is the oxidation agent)

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Y is being oxidized (it is the reducing agent)

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Some species like to be oxidized, some like to be reduced. This can be reasoned with periodic trends Chapter 9

Thermochemistry energy of reactions -

Gibbs free energy exp: G = H - TS

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G = gibbs free energy (kJ/mol)

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H = enthalpy (heat of the reaction) (kJ/mol)

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S = entropy (disorder of reaction) (J/mol x K)

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T = temperature (Kelvin)

Change in Energy = E 1. E = change in energy magnitude (q +w) -

Q = heat (heat that is absorbed is endothermic [+], heat that is given off is exothermic [-])

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W = work (is done on system [+], or is done by system [-]. Work is always involved in gaseous reactions. Gas can do work by expansion/contraction). Liquids and solids can not do work. Work is equal to +/- PV

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System + surroundings = universe...