BI110 Chapter Notes - Chapter 2: Chemical Polarity, Surface Tension, Electronegativity

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14 Mar 2018
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Nasa wants to follow water in order to ns extraterrestrial life. Water has polar covalent bonds meaning uneven distribution of electrons. Polar molecule: regions of + and - charges. Water is a good solvent meaning able to dissolve many substances. Aqueous: molecules dossolvedinto water making it a solution watery. Non-polar: do not have regions of + and - charges. They arrange themselves to minimize contact with water. Hydrophobic e ect: polar molecules exclude non-polar ones drive biological processes like folding of proteins and formation of cell membranes. Because oxygen and hydrogen atoms have slight charges making water orient to minimize repulsion. Hydrogen bond: interaction between hydrogen atom with a slight + charge and an electronegative atom of another molecule. Hydrogen bonds are depicted by dotted lines. Hydrogen bond are weaker that covalent bonds. They in uence structure of liquid water and ice. This results in high surface tension and water movement in plants.

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