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Week 3 Notes

by: Kylie McLaughlin

Week 3 Notes Chem 211

Kylie McLaughlin
General Chemistry II
Dr. James R Horn

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About this Document

Here's week 3 notes. It covers the beginning of chapter 13.
General Chemistry II
Dr. James R Horn
Class Notes
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This 2 page Class Notes was uploaded by Kylie McLaughlin on Sunday September 13, 2015. The Class Notes belongs to Chem 211 at Northern Illinois University taught by Dr. James R Horn in Fall 2015. Since its upload, it has received 64 views. For similar materials see General Chemistry II in Chemistry at Northern Illinois University.

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Date Created: 09/13/15
Week 3 Notes Chapter 13 The Properties of Mixture Solutions and Colloids LIKES DISSOLVE LIKES major types of intermolecular forces in solutions iondipoe H bond dipoedipole Joanduced dipoeinduced substances with similar types of intermolecular forces in each other when a solute dissolves in a solvent solutesolute interactions and solventsolvent interactions are being replaced with solutesolvent interactions The forces must be comparable in strength in order to have a solution occur the longer something is more dispersion forces it will have Enthalpy AH rxn AH product AH reactant AH state function AH solution AH1 AH2 AH3 Heat of Solution and Solution Cvcles 1 Solute particles separate from each other endothermic a Soluteaggregated heat gt soluteseparated AH solute gt 0 2 Solvent particles separate from each other endothermic a Solventaggregated heat gt solventseparated AH solvent gt 0 3 Solute and solvent particles mix exothermic a Soluteseparated solventseparated gt solution heat AH mix lt 0 AH solution AH solute AH solvent AH mix Heats of Hvdration solvation of ions by water always exothermic AH hydration is related to the charge density of the ion that is columbic charge and size matter attice energy is the AH involved in the formation of an ionic solid from its gaseous ions AH lattice is always negative and very big Examples from class Predicting Relative Solubility39s of Substances Problem Predict which solvent will dissolve more of the given solute 1 Sodium chloride in methanol CH3OH or in propanol CH3CH20H LEthylene glycol HOCH2CH20H in hexane CH3CH2CH2CH2CH2CH3 or in water 3 Diethyl ether CH3CH20CH2CH3 in water or in ethanol CH3CH20H Plan Consider the Intermolecular forces which can exist between solute molecules and consider whether the solvent can provide such interactions and thereby substitute Solution 1 Methanol NaCl is ionic and will form iondipoles with the OH groups of both methanol and propanol However propanol is subject to the dispersion forces to a greater extent 2 Water hexane has no dipoles to interact with the OH groups in ethylene glycol Water can H bond to the ethylene glycol 3 Ethanol diethyl ether can interact through a dipole and dispersion forces Ethanol can provide both while water would like to H bond Entropy natural tendency of a system to distribute its energy in as many ways possible


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