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Mastering Biology. Chapters 2-5 Questions with correct Answers
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Mastering Biology. Chapters 2-5
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Mastering Biology. Chapters 2-5A water molecule can bond to up to _____ other water molecules by ____ bonds -
answer Four, hydrogen
The unequal sharing of electrons within a water molecule makes the water molecule
_____. - answer polar
The tendency of an atom to pull electrons toward itself is referred to as its _____. -
answer electronegativity
In this molecule, what type of bond is found between the oxygen and hydrogens? -
answer polar covalent
Which of these bonds is weakest? - answer hydrogen bond
Why isn't this insect drowning? - answer surface tension
Which of the following takes place as an ice cube cools a drink? - answer Kinetic energy
in the liquid water decreases.
To act as an effective coolant in a car's radiator, a substance has to have the capacity
to absorb a great deal of heat. You have a reference book with tables listing the
physical properties of many liquids. In choosing a coolant for your car, which table
would you check first? - answer specific heat
Why are hydrocarbons insoluble in water? - answer The majority of their bonds are
nonpolar covalent carbon-to-hydrogen linkages.
Water is a source of ______________ for chemical reactions in cells.
(a) hydrogen atoms
(b) oxygen atoms
(c) energy
(d) Both (a) and (b)
(e) (a), (b), and (c). - answer Both A and B
Which statement is true of water's tensile strength?
(a) It results from hydrogen bonding.
(b) It helps to pull water through plants.
(c) It involves both cohesion and adhesion.
, (d) Both (a) and (b).
(e) (a), (b), and (c). - answer A, B and C
Water has surface tension because ... - answer hydrogen bonds between surface water
molecules resist being stretched.
Which of the following helps most to explain why water has a high specific heat? -
answerA water molecule can make 4 hydrogen bonds.
Which statement must be mentioned in explaining why amphipathic molecules line up at
a water surface? - answer Polar groups attract one another
Dissolving is best described as - answera mingling of molecules and/or ions.
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.
(c) Water has more energy at the body surface.
(d) Both (a) and (b).
(e) (a), (b), and (c). - answer Both A and B
Though you add heat, the temperature of boiling water remains constant because ... -
answerit takes energy to break hydrogen bonds.
Which statement helps to explain why ice is less dense than liquid water?
(a) Water molecules make hydrogen bonds at definite angles.
(b) Cold molecules move less than warm molecules.
(c) Hydrogen bonds lengthen in the cold.
(d) All of the above.
(e) Both (a) and (b). - answerBoth A and B
The open spaces in water's crystal structure make it possible for ...
(a) aquatic life to exist at the North Pole.
(b) water to have a low boiling point.
(c) life to occur in hot springs.
(d) Both (b) and (c).
(e) (a), (b), and (c) - answeraquatic life to exist at the North Pole
Why doesn't oil mix with water?
(a) Nonpolar molecules repel water molecules.
(b) Polar molecules repel nonpolar molecules.
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