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Unformatted text preview: In the first week of class we learned that a homogeneous mixture of two or more substances is called a solution. If one of the substances is present in much greater quantities than all the other substances then it is called the solvent . The other substances in solution are known as solutes . For example, when a small amount of NH 4 Cl is dissolved in a large quantity of water we refer to water as the solvent and NH 4 Cl as the solute. Another example is Napthalene (used in mothballs) can be dissolved in benzene. In this example benzene is the solvent and napthalene is the solute. Solutes dissolved in water (solvent) are called aqueous solutions. Not all substances are soluble in water. Why do some substances dissolve in water and others don't? It has to do with the structure of the water molecule. Oxygen has a greater attraction for electrons, so the shared electrons (bonding electrons) spend more time close to oxygen then to either of the hydrogens. This gives oxygen a slightly excess negative charge and hydrogen a to oxygen then to either of the hydrogens....
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This note was uploaded on 10/13/2011 for the course CHEMISTRY 121 taught by Professor Staff during the Fall '10 term at Bangladesh University of Eng and Tech.
- Fall '10