Biology 101 Test Bank Water and Life

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Biology 101Test vg vg




Bank
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Water and Life
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1. In a single molecule of water, two hydrogen atoms
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vgarebonded to a single oxygen atom by? vg vg vg vg vg vg




A. hydrogen bonds. vg



B. nonpolar covalent bonds. vg vg




C. polar covalent bonds. vg vg



D. ionic bonds. vg



E. van der Waals interactions.
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2. In a group of water molecules, hydrogen bonds
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vgformbetween?

A. the oxygen atoms in different water molecules
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B. Two hydrogen atoms in different water molecules
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C. the oxygen atom in one water molecule and
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ahydrogen atom in another water molecule
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D. the hydrogen atoms in a single water molecule
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E. None of the listed responses is Correct
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3. Life on Earth is dependent on all the properties of
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vgwatertas well as the abundance of water. Which
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vgproperty of water is probably most important for the
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vgfunctioning of organisms at the molecular level? vg vg vg vg vg vg




A. high specific heatvg vg



B. cohesion and high surface tension vg vg vg vg



C. versatility as a solvent vg vg vg




D. expansion upon freezing vg vg



E. high heat of vaporization
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4. Some substances, such as oil and gasoline, will
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vgnottdissolve in water because? vg vg vg




A. oil and gasoline are organic compounds,
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B. their molecules have no charges or partial charges
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towhich water molecules can adhere
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C. their electrons are so stable that they do not
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exchangeatoms with water molecules
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D. they do not ionizevg vg vg




E. their molecules are so large
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5. The partial charges on a water molecule occur
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vgbecauseof?

A. widespread ionization vg



B. the unequal sharing of electrons between the
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vghydrogen and the oxygen atoms of a water vg vg vg vg vg vg vg




vgmolecule
C. the high electronegativity of hydrogen
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D. covalent bonding vg




E. the achievement of a stable configuration by one atom of
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vgabond but not by the other partner
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6. Water molecules have
vg than molecules of vg vg vg



vgsimilartsize, such as ammonia and methane, vg vg vg vg vg




vgreflecting its capacity to absorb large amounts of
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vgheat.

A. less surface tensionvg vg



B. a higher boiling point
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C. a lower capacity for forming
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D. lower specific heat hydrogen bonds
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E. a lower melting point
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7. Most of water's unique features (for example, its
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vgversatility as a solvent, ability to moderate
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vgtemperature,and cohesive behavior) result from vg vg vg vg




vgthe fact that?
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A. hydrogen is the only element without any neutrons.
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B. oxygen attracts electrons more than hydrogen does.
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C. oxygen has only one stable isotope, but hydrogen
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vghasthree.
D. oxygen has two unfilled electron shells.
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E. More than one of the above is Correct.
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8. The slight negative charge at one end of one water
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vgmolecule is attracted to the slight positive charge of
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vganother water molecule. What is this attraction
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vgcalled?

A. a covalent bond
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B. a hydrogen bond
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C. an ionic bond
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D. a hydrophilic bond
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E. a van der Waals interaction
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9. Sulfur is in the same column of the periodic table
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vgasoxygen, but has electronegativity similar tovg vg vg vg vg




vgcarbon. Compared to water molecules,
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vgmolecules of H2S? vg vg




A. will ionize more readily.
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B. will have greater cohesion to other molecules of H2S.
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C. will have a greater tendency to form hydrogen bonds
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vgwitheach other. vg




D. will have a higher capacity to absorb heat for the
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vgsamechange in temperature. vg vg



E. will not form hydrogen bonds with each other.
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10. Water molecules are able to form hydrogen bonds with?
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A. compounds that have polar covalent bonds. vg vg vg vg vg




B. oils.
C. oxygen gas (O2. molecules. vg vg vg




D. chloride ions. vg



E. any compound that is not soluble in water.
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