Biology 311C Lecture 3 - August 29, 2011 Biology 311C...

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August 29, 2011 Biology 311C Lecture 3 Overview of Water: The molecule That Supports All of Life Water is the biological medium on Earth. Most cells are surrounded by water and cells themselves are about 70-95% water. How do water molecules interact with each other: The oxygen is sharing a bit more around hydrogen. Oxygen has a partial negative charge and hydrogen has a partial positive charge. Hydrogen bonding is happening. The maximum amount of hydrogen bonding can occur is 4. The bond between the hydrogen and oxygen in the individual molecule is covalent. When table salt (NaCl) dissolves in water, what bonds are being broken and what new bonds are being formed? An ionic bond is broken. If you have a positive ion, the oxygen part of the molecule points towards it. Nonpolar molecules have no charge. Water has hydrogen bonding and oil is hydrophobic so it repels water. Oxygen and hydrogen are covalent do not share the electrons equally which makes it
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