Chemistry Lecture Notes5

Chemistry Lecture Notes5 - Chemistry Lecture Notes Review...

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Chemistry Lecture Notes Review from Chem 150 Lattice Energy Definition- delta H lattice or delta H liquid is the enthalpy change that accompanies the separation of 1 mole of ionic solid into gaseous ions. For an ionic solid the delta H liquid is the delta H solute. Delta H solution is equal to the delta H solute plus the delta H of hydration (eq. 13.2) Delta H of solution is equal to the delta H of liquid plus the delta H of hydration (ionic solid) For NH4Cl (cold packs), when it dissolves the delta H is positive which is endothermic. This means that it takes energy to dissolve. It takes the energy from the environment/surroundings [Transparency See Figure 13.5 in textbook] for the exothermic and endothermic processes Question?: If the delta H solution is endothermic then why does the ionic solid dissolve? Because of the entropy! It turns out that delta H solution is only one of the 2 factors that matter.
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This note was uploaded on 03/30/2011 for the course ENGINEERIN 127 taught by Professor Finch during the Spring '08 term at Rutgers.

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Chemistry Lecture Notes5 - Chemistry Lecture Notes Review...

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