BIOL 151 Chapter 3: Textbook Notes
Document Summary
The polarity of water molecules results in hydrogen. The chemical bonds in water are polar covalent bonds. There is an unequal distribution of electrons, causing the two ends to have opposite charges. The oxygens have a partial negative charge and the hydrogen has a partial positive charge. Two separate water molecules are held together by a hydrogen bond. The hydrogen bonds holding the substance together is called cohesion. This helps the substance stay strong and stable. Adhesion of water to cell walls by hydrogen bonds helps counter the downward pull of gravity. Surface tension is a measure of how dif cult it is to break the surface of a liquid, such as water. Water has a greater surface tension than most liquids, which allows some small animals to walk on water. Water moderates air temperature by absorbing heat from warmer air and releasing that stored heat to cooler air.
