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CHEM 219: Module 2 Exam Actual
Questions With 100% Verified Answers
2025
What are Van der Waals forces? -correct-answer-The attractive forces between
molecules.
The polarization in VDWF's are: -correct-answer-Temporary and weak
What is the relationship between branching and VDWF? -correct-answer-As you
branch out you gain more surface area and lower the VDWF. Which lowers the BP
and MP
Alkanes can adopt different conformations, What does this mean? -correct-
answer-This means that it can change shapes as it can rotate around bonds.
Hydrogen bonding and VDWFS are classifies as nonbonding intermolecular forces,
what does this mean? -correct-answer-That they are attractive forces between
molecules that are not true bonds in the sense of sharing or donating.
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What are conformers? -correct-answer-Different shapes of molecules that are
derived by rotations of single bonds.
What does the Newman projection do? -correct-answer-It shows the
conformation of molecules when looking down a particular bond axis.
What is the difference in hydrogen placement between an eclipsed confirmation
and a staggered one? -correct-answer-The hydrogens do not overlap in staggered
but they do in eclipsed.
Certain conformers are called rotamers, why? -correct-answer-They can simply be
rotated into the other conformer. Used with newman projections
Staggered vs. Eclipsed Conformers -correct-answer-Staggered are generally more
stable, because of the removed repulsion that occurs when electrons are aligned
on top of each other in an eclipsed.
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How do you name newman projections? -correct-answer-Find the first carbon
chain, attach it to the front carbon. The rest are substituents. Then attach it to the
back carbon. Then attach the first carbon chain, the rest are substituents.
Can conformers be isolated at room temp? -correct-answer-No, because theres a
lot of thermal energy, it starts the rapid inter conversion of conformers. Meaning
it rotates back and forth
What are cycloalkanes? -correct-answer-Alkanes whose carbon skeleton forms a
ring. (only c-c sigma bonds)
Cycloalkanes that have 1 ring has the general formula of? -correct-answer-Cn+H2n
How are cycloalkanes named? -correct-answer-With the prefix cyclo- in front of
the corresponding alkane name
What is the systemic approach when alkyl substituents are present? -correct-
answer-1. If only one substituent is present then no locants (numbers) are used.
2. If more than one is present. It is put in order
CHEM 219: Module 2 Exam Actual
Questions With 100% Verified Answers
2025
What are Van der Waals forces? -correct-answer-The attractive forces between
molecules.
The polarization in VDWF's are: -correct-answer-Temporary and weak
What is the relationship between branching and VDWF? -correct-answer-As you
branch out you gain more surface area and lower the VDWF. Which lowers the BP
and MP
Alkanes can adopt different conformations, What does this mean? -correct-
answer-This means that it can change shapes as it can rotate around bonds.
Hydrogen bonding and VDWFS are classifies as nonbonding intermolecular forces,
what does this mean? -correct-answer-That they are attractive forces between
molecules that are not true bonds in the sense of sharing or donating.
,2|Page
What are conformers? -correct-answer-Different shapes of molecules that are
derived by rotations of single bonds.
What does the Newman projection do? -correct-answer-It shows the
conformation of molecules when looking down a particular bond axis.
What is the difference in hydrogen placement between an eclipsed confirmation
and a staggered one? -correct-answer-The hydrogens do not overlap in staggered
but they do in eclipsed.
Certain conformers are called rotamers, why? -correct-answer-They can simply be
rotated into the other conformer. Used with newman projections
Staggered vs. Eclipsed Conformers -correct-answer-Staggered are generally more
stable, because of the removed repulsion that occurs when electrons are aligned
on top of each other in an eclipsed.
, 3|Page
How do you name newman projections? -correct-answer-Find the first carbon
chain, attach it to the front carbon. The rest are substituents. Then attach it to the
back carbon. Then attach the first carbon chain, the rest are substituents.
Can conformers be isolated at room temp? -correct-answer-No, because theres a
lot of thermal energy, it starts the rapid inter conversion of conformers. Meaning
it rotates back and forth
What are cycloalkanes? -correct-answer-Alkanes whose carbon skeleton forms a
ring. (only c-c sigma bonds)
Cycloalkanes that have 1 ring has the general formula of? -correct-answer-Cn+H2n
How are cycloalkanes named? -correct-answer-With the prefix cyclo- in front of
the corresponding alkane name
What is the systemic approach when alkyl substituents are present? -correct-
answer-1. If only one substituent is present then no locants (numbers) are used.
2. If more than one is present. It is put in order
