AP Biology: Properties of Water Questions and Answers 100% Pass

AP Biology: Properties of Water Questions and Answers 100% Pass Adhesion Water molecules make hydrogen bonds with different molecules Adhesion example in life 1) When water is pulled up the xylem by the process of transpiration, the water clings to the sides of the xylem, which carries water from the roots to leaf An example in biology where water is a good solvent... Blood because it's plasma holds many solutes, like nutrients. These nutrients (vitamins, minerals...) are pumped through the body to supply energy. Are ice hydrogen bonds unstable or stable? *STABLE* (with more space between the atoms) Are water molecule hydrogen bonds unstable or stable? *UNSTABLE* Because water is a polar molecule, it's able to form THIS, either with itself or other charged molecules... hydrogen bonds Cohesion Water molecules holding together by making hydrogen bonds with another water molecule Cohesion and Adhesion example in life Plant Transpiration! (Basically just combine the other two examples) Cohesion example in life 1) Some animals being able to walk, stand, or run on water without breaking the surface. 2) Water at the stoma of a leaf creating a pull on surrounding water molecules High specific heat example in life 1) Water can absorb or release large amounts of heat with only a slight change in it's temperature, like how the ocean resists temperature during different seasons. How do the properties of water contribute to the upward movement of water in a tree? Hydrogen bonds hold neighboring water molecules together. This cohesion helps the chain of water molecules move upward against gravity in water conducting cells as water evaporates from the leaves Adhesion between water molecules and the walls of the water conducting cells also helps counter gravity Less dense as a solid example in life During the summer, only the few upper centimeters of the ocean surface would thaw, allowing life to exist under the frozen surface. Up to how many hydrogen bonds can each water molecule make? *4* Water is allowed to have properties because it is THIS type of molecule... polar molecule Water is an excellent solvent example in life Blood's plasma holds solutes, like nutrients. These nutrients (vitamins, minerals...) are dissolved into the bloodstream and pumped through the body to supply energy. What allows hydrogen bonds to form?