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Biology Chapter 3
Terms in this set (15)
Many of water's emergent properties, such as its cohesion, its high specific heat, and its high heat of vaporization, result from the fact that water molecules
are attracted to each other by partial negative and positive charges on the oxygen and hydrogen atoms, respectively; The formation of hydrogen bonds between the positive and negative regions of different water molecules accounts for most of water's unique properties.
Which property of water allows dogs to cool themselves by panting?
water's high heat of vaporization; Evaporative cooling takes place when molecules with the greatest kinetic energy leave a fluid as gas molecules. Because of water's high heat of vaporization, a large amount of heat must be absorbed for 1 gram of water to be converted from liquid to gas. The dog loses this heat as the water on its tongue evaporates, allowing him to cool down by panting. To understand why this answer is correct, read about evaporative cooling.
Which property of water allows a paper towel to pick up a puddle of water?
adhesion of water molecules to other kinds of molecules; Water adheres to the cellulose molecules in a paper towel, allowing the towel to pick up a puddle of water. This is similar to the adhesion between water molecules and cellulose in cell walls responsible for water transport in plants.
Which statement must be mentioned in explaining why amphipathic molecules line up at a water surface?
polar groups attract one another; Good thinking! Polar water molecules pull together, holding the polar parts of the amphipathic molecules and squeezing out the nonpolar parts. That leaves the nonpolar parts waving in the air.
Dissolving is best described as ...
a mingling of molecules and/or ions; Good! When sugar dissolves in water, the sugar molecules remain intact but mingle with water molecules. When salt (NaCl) dissolves, its Na+ and Cl- ions separately mingle with water.
Water is a source of ______________ for chemical reactions in cells.
hydrogen and oxygen; Good answer! Many reactions incorporate O and H from water into biological molecules. This happens when you digest starch and protein, for example
Which statement is true of water's tensile strength?
-It results from hydrogen bonding.
-It helps pull water through plants.
-it involves both cohesion and adhesion
Water has surface tension because ...
hydrogen bonds between surface water molecules resist being stretched
Which of the following helps most to explain why water has a high specific heat?
(a) A water molecule can make 4 hydrogen bonds.
Which factor is important in making it possible to cool yourself by sweating? Think carefully!
(a) Molecules collide with varied angles and speeds.
(b) Hydrogen bonds are relatively weak.
Though you add heat, the temperature of boiling water remains constant because
it takes energy to break hydrogen bonds.
Which statement helps to explain why ice is less dense than liquid water?
-Water molecules make hydrogen bonds at definite angles.
-Cold molecules move less than warm molecules.
The open spaces in water's crystal structure make it possible for ...
(a) aquatic life to exist at the North Pole.
Why doesn't oil mix with water?
Polar molecules attract one another.
which of the following is a hydrophobic material?
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