BIO 100 EXAM 2 PRACTICE QUESTIONS
AND COMPLETE SOLUTIONS
◉ CHON
Answer: Carbon, Hydrogen, Oxygen, and Nitrogen; make up 96%
of living cells.
◉ Trace elements
Answer: Elements organisms need in very small amounts, like
iron and zinc.
◉ Emergent property
Answer: A new property that appears when smaller parts interact.
◉ Molecule
Answer: Two or more atoms chemically bonded together.
◉ Chemical change vs. State change
Answer: State changes keep the molecule same; chemical changes
break or form bonds to create different molecules.
◉ Nonpolar covalent bond
Answer: Bond where electrons are shared equally.
, ◉ Polar covalent bond
Answer: Bond where electrons are shared unequally.
◉ Ionic bond
Answer: Bond where electrons are transferred, creating charged
ions.
◉ Hydrogen bond
Answer: Weak attraction between partially charged molecules or
regions.
◉ Carbon's bonding capacity
Answer: Has 4 valence electrons, allowing it to form up to 4
covalent bonds.
◉ Cohesion (water)
Answer: Water sticks to water because of hydrogen bonds.
◉ Adhesion (water)
Answer: Water sticks to other substances.
◉ Specific heat of water
AND COMPLETE SOLUTIONS
◉ CHON
Answer: Carbon, Hydrogen, Oxygen, and Nitrogen; make up 96%
of living cells.
◉ Trace elements
Answer: Elements organisms need in very small amounts, like
iron and zinc.
◉ Emergent property
Answer: A new property that appears when smaller parts interact.
◉ Molecule
Answer: Two or more atoms chemically bonded together.
◉ Chemical change vs. State change
Answer: State changes keep the molecule same; chemical changes
break or form bonds to create different molecules.
◉ Nonpolar covalent bond
Answer: Bond where electrons are shared equally.
, ◉ Polar covalent bond
Answer: Bond where electrons are shared unequally.
◉ Ionic bond
Answer: Bond where electrons are transferred, creating charged
ions.
◉ Hydrogen bond
Answer: Weak attraction between partially charged molecules or
regions.
◉ Carbon's bonding capacity
Answer: Has 4 valence electrons, allowing it to form up to 4
covalent bonds.
◉ Cohesion (water)
Answer: Water sticks to water because of hydrogen bonds.
◉ Adhesion (water)
Answer: Water sticks to other substances.
◉ Specific heat of water
