Chapter 2

Chapter 2 - Chapter 2: Water Every living organism requires...

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Chapter 2: Water Every living organism requires water to some extent or another. For example, plants split water to produce oxygen and carbohydrates. Mammals, at the other extreme, use the reduction of oxygen to water to produce energy in the form of ATP. I. Physical properties of water A. Water can influence the 3-D structure of macromolecule, and therefore can influence the function. B. Most biochemical reactions take place in an aqueous environment a. Water participates in many biochemical reactions C. Water has the ability to autoionize a. At 25°C, K w = 1E-14 = [H+][OH-] II. Structure of water (See Fig. 2-1) A. Polar molecule a. Because of the difference in electronegativity in polar covalent bonds B. Geometry is sp 3 . Water has a bond angle of 104.5°. - Why isn’t the bond angle = 109.5°? Because it contains 2 lone pairs C. Water has hydrogen bonding (H-bond.) potential - A hydrogen bond is a special type of dipole-dipole interaction 1. H-bond: H is shared between 2 electronegative atoms
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Chapter 2 - Chapter 2: Water Every living organism requires...

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