BIO 1305 Chapter Notes - Chapter 3: Hydrogen Bond, Heat Capacity, Coffeemaker

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Oxygen is more electronegative than hydrogen, so the electrons of the covalent bonds spend more time closer to oxygen than to hydrogen making it polar covalent bonds (its overall charge is unevenly distributed). These bonds in water molecules (polarity) result in hydrogen bonding, keeping them close together. A hydrogen bond forms when the slightly negatively charged oxygen of one water molecule is attracted to the slightly positively charged hydrogen of a nearby water molecule. It is the only common substance to exist in the natural environment in all three physical states of matter. Hydrogen bonds are very fragile in water"s liquid form. They form, break, and reform with great frequency. Four emergent properties of water that contribute to earth"s suitability as an environment for life: cohesive behavior, ability to moderate temperature, expansion upon freezing, and versatility as a solvent. Many water molecules are linked by multiple hydrogen bonds; these linkages make water more structures than most other liquids.

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