BIOL 105 Lecture Notes - Hydrogen Bond, Chemical Polarity, Hydrogen Atom
Document Summary
Polar covalent bonds in water molecules result in hydrogen bonding. Acidic and basic conditions affect living organism. Four emergent properties of water contribute to earth"s suitability for life. Electrons of the polar covalent bonds spend more time near oxygen than hydrogen. Charge unevenly distributed; making water a polar molecule. Polarity results in hydrogen bonds between molecules. Four properties of water that contribute to suitable environment for life: Cohesion - hydrogen bonds collectively hold molecules together. Helps to counter downward pull of gravity. Water absorbs heat from warmer air and releases stored heat to cooler air. Absorbs or releases large amount of heat with only a slight change in its own temperature. Random energy of moving atoms or molecules. Temperature - average kinetic energy of molecules in a body of matter. Heat - thermal energy transfer from one body of matter to another. Calorie - amount of heat required to raise temp of 1g of water by 1 degree celsius.
