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Properties of Water and pH. http://www.youtube.com/watch?v= aVmU3CLxvgU. Van der Waals Forces. Van der Waals forces- force between molecules due to intermolecular attraction. Hydrogen Bonding. - PowerPoint PPT Presentation
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Properties of Water and pH
http://www.youtube.com/watch?v=aVmU3CLxvgU
Van der Waals Forces
• Van der Waals forces- force between molecules due to intermolecular attraction.
Hydrogen Bonding
• Hydrogen bonding- a type of intermolecular attraction due to differences in electronegativity between a polar molecule that contains hydrogen and an atom in another polar molecule.
Properties of Water• ALL a result of water’s ability to hydrogen
bond!• Cohesion• Adhesion– Capillary action
Properties of Water
• Heat capacity
• Expands when frozen• Ice is less dense than water
Mixtures of Water• Solutions- all components are evenly distributed.– Solute– Solvent
• Suspensions- all components are NOT evenly distributed, water and nondissolved material.
Example of both a solution and a suspension: blood
pH Scale
• Indicates the concentration of H+ in a solution.pH = -log [H+]
Buffers
Buffers
• Weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH.
• Buffers dissolved in living organisms play an important role in maintaining homeostasis in organisms.
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