About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter? - ANS carbon, hydrogen, nitrogen, oxygen
Trace elements are those required by an organism in only minute quantities. Which of the following is a trace...
BIOLOGY CUMULATIVE
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, About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25
elements make up approximately 96% of living matter? - ANS carbon, hydrogen, nitrogen,
oxygen
Trace elements are those required by an organism in only minute quantities. Which of the
following is a trace element that is required by humans and other vertebrates, but not by other
organisms such as bacteria or plants? - ANS iodine
Which of the following statements is TRUE? - ANS Some naturally occurring elements are
toxic to organisms.
Which of the following are compounds? - ANS H2O and CH4, but not O2
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Atoms have no electric charge because they have ________. - ANS an equal number of
protons and electrons
An ion with six protons, seven neutrons, and a charge of 2+ has an atomic number of
________. - ANS 6
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Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers
from 92-100. Which of the following can be true? - ANS Molybdenum atoms can have between
50 and 58 neutrons.
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In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by
________. - ANS Polar covalent bonds
The partial negative charge at one end of a water molecule is attracted to the partial positive
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charge of another water molecule. What is this attraction called? - ANS a hydrogen bond
The partial negative charge in a molecule of water occurs because ________. - ANS the
electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen
atom nucleus than around the hydrogen atom nucleus
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Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar to
carbon. Compared to water molecules, molecules of H2S will ________. - ANS not form
hydrogen bonds with each other
Water molecules can form hydrogen bonds with ________. - ANS compounds that have polar
covalent bonds
Cohesion, surface tension, and adhesion are the properties of water molecules that ________. -
ANS are a result of hydrogen bonding
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