Chem141 Chapter4 noets

Chem141 Chapter4 noets - Wenlong Wu Chapter 4 The Major...

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Wenlong Wu Chapter 4: The Major Classes of Chemical Reactions 4.1 The role of water as a Solvent Water is a  SOLVENT , the dissolving substance is the SOLUTE. Polar nature of water:   o the distribution of the bonding electrons: O attracts stronger, so electrons spend  more time with the O.  2) the overall shape: produces a polar arrow.   All of this  make water a  POLAR molecule Ionic compounds in water:  the SUM of the attractions of water molecules outweighs the attraction between the ions  and those ions become tightly enclosed with water molecules, and so becomes  solvated . For those that do not solvate, the forces between the ions remain stronger  than the attraction of water.  Note: solubility also depends on natural tendency of  particles to disperse randomly through the solution.  Electrolyte : a substance that conducts a current when dissolved in water. Some are  strong and some are weak.  Covalent compounds in water: o Water dissolves covalent compounds also.  All but one group of these are  nonelectrolytes o Acids: are the only ones that are electrolytes because of the polar bonds to  hydrogen.  4.2 Writing Equations for aqueous Ionic Reactions 3 types of equations for aqueous ionic reactions o molecular: shows all react and prod as if they are intact undissociated
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Chem141 Chapter4 noets - Wenlong Wu Chapter 4 The Major...

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