BIO152H5 Chapter Notes - Chapter 3: Evaporative Cooler, Hydrogen Bond, Chemical Polarity
Document Summary
Concept 3. 1 polar covalent bonds in water molecules result in hydrogen bonding (p. 50: water is a polar molecule. A hydrogen bond forms when the slightly negatively charged oxygen of one water molecule is attracted to the slightly positively charged hydrogen of a nearby water molecule. Hydrogen bonding between water molecules is the basis for water"s properties. Concept 3. 2 four emergent properties of water contribute to. 50 56: hydrogen bonding keeps water molecules close to each other, and this cohesion helps pull water upward in the microscopic water-conducting cells of plants. Hydrogen bonding is also responsible for water"s surface tension: water has a high specific heat: heat is absorbed when hydrogen bonds break and is released when hydrogen bonds form. This helps keep temperatures relatively steady, within limits that permit life. Evaporative cooling is based on water"s high heat of vaporization. The evaporative loss of the most energetic water molecules cools a surface.
