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Properties of Water and pH

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.

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Properties of Water and pH

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  1. Properties of Water and pH http://www.youtube.com/watch?v=aVmU3CLxvgU

  2. Van der Waals Forces • Van der Waals forces- force between molecules due to intermolecular attraction.

  3. 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.

  4. Properties of Water • ALL a result of water’s ability to hydrogen bond! • Cohesion • Adhesion • Capillary action

  5. Properties of Water • Heat capacity • Expands when frozen • Ice is less dense than water

  6. 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

  7. pH Scale • Indicates the concentration of H+ in a solution. pH = -log [H+]

  8. Buffers

  9. 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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