151F09_W13_LV_2_veryshort

151F09_W13_LV_2_veryshort - General Chemistry CHEM 151 Week...

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UA GenChem General Chemistry General Chemistry CHEM 151 CHEM 151 Week 13
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UA GenChem Exam 3 – Monday Nov. 16th Electron dots we can see will be counted! Include ALL electrons in a Lewis structure ! Don’t forget individual brackets and arrows in resonance structures Remember brackets with outside charges for charged molecules Properties and types of substances will be on this exam (i.e. does not conduct electricity as a solid but does when dissolved = ionic compound.) Bring your calculator!
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UA GenChem SOLUBILITY: IONIC COMPOUNDS Some ionic compounds are very soluble in water, while others are almost completely insoluble. Water and ions must interact to cause solubility.
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UA GenChem Ion-Ion Interactions Why does water align this way?
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GenChem Attraction between ions and dipole depends on ion charge and ion-dipole distance . 1922 kJ/mol 1922 kJ/mol 405 kJ/mol 405 kJ/mol 263 kJ/mol 263 kJ/mol O H H δ + δ - • • • O H H δ + δ - • • • O H H δ + δ - • • • Na + Mg 2+ Cs + Solubility: Ionic Compounds Ionic compounds with large ions have weaker ion-ion interactions. The interactions with water are also weaker . So,
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at Arizona.

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151F09_W13_LV_2_veryshort - General Chemistry CHEM 151 Week...

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