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Unformatted text preview: UNIT ONE: THE CHEMISTRY OF Chapter T Chapter T Chapter T Chapter Three: hree: hree: hree: Water and Water and Water and Water and the the the the (Text from Biology , 6 th Edition, b Text from Biology Water an The Polarity of Water Molecules A water molecule consists of tw oxygen atom. Since oxygen is m electrons of the polar bonds are activity, the bonds holding toge where the oxygen region has a p a partial positive charge. Water having opposite charges. Attractions between these pola are formed because of electrical the slightly negative oxygen of a by a hydrogen bond. Each wate molecules. Organisms Depend on the Cohe Hydrogen bonds hold water mol hydrogen bonds continually brea new bonds with other water mo are bonded to their neighbors, w liquids. The hydrogen bonds hol cohesion cohesion cohesion cohesion. Since the hy leaves of pla evaporates f bonds cause vessel. Adhe Adhe Adhe Adhe adhesion of w Cohesion is r break the su is a direct res Water Moderates Temperatures Water can absorb a relatively lar This is why water is slower to co F LIFE e Fitness of the Environment e Fitness of the Environment e Fitness of the Environment e Fitness of the Environment by Campbell and Reece) nd the Fitness of the Environment (Chapter THE EFFECTS OF WATERS POLARITY s Results in Hydrogen Bonding wo hydrogen atoms covalently bonded to one more electronegative than the hydrogen, the e drawn to the oxygen atom. Because of such ether a water molecule are polar covalent bonds, partial negative charge and the hydrogens having r is a polar molecule polar molecule polar molecule polar molecule, with its opposite ends ar molecules allow for the unusual properties of w l attraction: a slightly positive hydrogen of one m another molecule, which causes the two molecu er molecule can form hydrogen bonds to a maxim esion of Water Molecules lecules together. When water is in liquid form, i ak and re-form. Molecules are continually formi olecules. As a result, most of the water molecul which makes water more structured than other ld the substance together in the phenomenon ca ydrogen bonds connect water molecules togethe ants through microscopic vessels extending from from a leaf, it is replaced by water in the vessels e the water leaving the leaf to pull on molecules esion esion esion esion, the clinging of one substance to another, water to the walls helps to counteract the force related to surface tension surface tension surface tension surface tension, a measure of how di rface of a liquid. Water acts as if it is coated by esult of the water molecules being hydrogen bon s on Earth rge amount of heat with only a slight change in ool on a cold day and slower to heat up on a war 1 r 3) , g water. Hydrogen bonds molecule is attracted to ules to be held together mum of four other water its ing les called er, water can reach the the roots. When water s of the leaf. Hydrogen further down the r, is also imprtant. The e of gravity....
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- Spring '08
- AP Biology