2025/2026 Exam Questions and Answers
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Ch 4: In a single molecule of water, the two hydrogen atoms are bonded to a single
oxygen atom by:
A. polar covalent bonds
B. ionic bonds
C. hydrogen bonds
D. non polar covalent bonds - 🧠ANSWER ✔✔A. polar covalent bonds
Ch 4: Stanley Miller's 1953 experiments demonstrated conclusively that
A. life arose on earth from simple organic molecules, with energy from lighting
and volcanoes
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,B. the conditions on early Earth were conducive to the origin of life
C. life arose on Earth 3.8 billion years ago from simple organic molecules
D. organic molecules can be synthesized abiotically under conditions that may
have existed on early Earth
E. the conditions on early Earth were conducive to the abiotic synthesis of organic
molecules - 🧠ANSWER ✔✔D. organic molecules can be synthesized abiotically
under conditions that may have existed on early Earth
Ch 4: What do the four 'elements of life' C, O, H, and N- have in common?
A. they are equal in electronegativity
B. they are elements produced only by living cells
C. they all have the same number of valence electrons
D. each element exists in only one isotopic form
E. they all have unpaired electrons in their valence shells - 🧠ANSWER ✔✔E. they
all have unpaired electrons in their valence shells
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,Ch 4: Water is able to form hydrogen bonds because
A. the oxygen atom in a water molecule has a weak positive charge
B. each of the hydrogen atoms in a water molecule is weakly negative in charge
C. oxygen has a valence of 2
D. the water molecule is shaped like a tetrahedron
E. the bonds that hold together the atoms in a water molecule are polar covalent
bonds - 🧠ANSWER ✔✔E. the bonds that hold together the atoms in a water
molecule are polar covalent bonds
Ch 4: Which functional group is an acidic functional group that can release H+ into
a solution
A. OH
B. C=O
C. COOH
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, D. NH2
E. SH - 🧠ANSWER ✔✔C. COOH
Ch 4: Which functional group is a basic functional group that can accept a H+?
A. OH
B. C=O
C. COOH
D. NH2
E. SH - 🧠ANSWER ✔✔D. NH2
Ch 4: Which functional group can exist as a ketone or aldehyde configuration?
A. OH
B. C=O
C. COOH
D. NH2
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