Biology 1201 Chapter 3 Questions and Answers 100% Pass

Biology 1201 Chapter 3 Questions and Answers 100% Pass What kind of molecule is the water molecule? polar molecule Water molecules form what kind of bond? hydrogen bonds What are the four water properties that facilitate an environment for life? cohesive behavior, ability to moderate temperature, expansion upon freezing, and versatility as a solvent Cohesion collectively, hydrogen bonds hold water molecules together What does cohesion help with? the transport of water against gravity in plants adhesion an attraction between different substances, for example, between water and plant cell walls Surface tension a measure of how hard it is to break the surface of a liquid. It is due to special arrangement of water molecules on the surface with air. Due to this, some animals can stand, walk or run on the water surface What is moderation of temperature by water? water absorbs heat from warmer air and releases stored heat to cooler air. True/False: It can also absorb or release a large amount of heat with only a slight change in its own temperature. True Kinetic energy the energy of motion heat measure of the total amount of kinetic energy due to molecular motion temperature the intensity of heat due to hte average kinetic energy of molecules calorie (cal) the heat required to raise the temperature of 1 g of water by 1C Joule (J) another unit of energy 1 J= _____ cal 0.239 cal 1 cal= _____ J 4.184 J Specific heat amount of heat that must be absorbed or lost for 1 g of that substance to change its temperature by 1C True/False: water has a specific heat that is larger than other true heat is ____ when hydrogen bonds break heat is ____ when hydrogen bonds form absorbed/released Heat of vaporization the heat a liquid must absorb for 1 g to be converted to gas Evaporative cooling The proccess where as a liquid evaporates, its remaining surface cools True/False: as a liquid evaporates, its remaining surface heats false- its remaining surface cools in a process called evaporative cooling Water molecules have a polarity which allows