CHEM219 MODULE 7 2026 CERTIFICATION
EVALUATION EXAM QUESTIONS AND
ANSWERS MASTER FILE
◉ How do you compare the boiling point of alkanes? Answer: The
longer the length of carbon, the higher the Boiling point. When it is
branched, it can have a higher boiling point, as long as it isn't the
parent chain that is branched.
◉ Are alkanes soluble in water? Answer: They are water-insoluble.
◉ Are alkanes polar or non-polar? Answer: Almost non-polar
◉ What is hydrogen bonding? Answer: The water molecules are
attracted to each other like magnets because of it's electron rich O
atom possessing a -charge and its electron poor H possessing a +
charge
◉ What will a mixture of alkane and water make? Answer: A two
layer-biphasic system. It will float on top of water. since its density is
less than 1g/ml
,◉ Are liquid alkanes used as solvents? Answer: Yes for other non
polar substances.
◉ When compared to other polar molecules of similar weight, are
alkanes lower or higher in melting and boiling points? Answer: They
are lower.
◉ What are Van der Waals forces? Answer: The attractive forces
between molecules.
◉ The polarization in VDWF's are: Answer: Temporary and weak
◉ What is the relationship between branching and VDWF? 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?
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? Answer: That they are
attractive forces between molecules that are not true bonds in the
sense of sharing or donating.
, ◉ What are conformers? Answer: Different shapes of molecules that
are derived by rotations of single bonds.
◉ What does the Newman projection do? 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? Answer: The hydrogens
do not overlap in staggered but they do in eclipsed.
◉ Certain conformers are called rotamers, why? Answer: They can
simply be rotated into the other conformer. Used with newman
projections
◉ Staggered vs. Eclipsed Conformers 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.
◉ How do you name newman projections? 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.
EVALUATION EXAM QUESTIONS AND
ANSWERS MASTER FILE
◉ How do you compare the boiling point of alkanes? Answer: The
longer the length of carbon, the higher the Boiling point. When it is
branched, it can have a higher boiling point, as long as it isn't the
parent chain that is branched.
◉ Are alkanes soluble in water? Answer: They are water-insoluble.
◉ Are alkanes polar or non-polar? Answer: Almost non-polar
◉ What is hydrogen bonding? Answer: The water molecules are
attracted to each other like magnets because of it's electron rich O
atom possessing a -charge and its electron poor H possessing a +
charge
◉ What will a mixture of alkane and water make? Answer: A two
layer-biphasic system. It will float on top of water. since its density is
less than 1g/ml
,◉ Are liquid alkanes used as solvents? Answer: Yes for other non
polar substances.
◉ When compared to other polar molecules of similar weight, are
alkanes lower or higher in melting and boiling points? Answer: They
are lower.
◉ What are Van der Waals forces? Answer: The attractive forces
between molecules.
◉ The polarization in VDWF's are: Answer: Temporary and weak
◉ What is the relationship between branching and VDWF? 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?
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? Answer: That they are
attractive forces between molecules that are not true bonds in the
sense of sharing or donating.
, ◉ What are conformers? Answer: Different shapes of molecules that
are derived by rotations of single bonds.
◉ What does the Newman projection do? 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? Answer: The hydrogens
do not overlap in staggered but they do in eclipsed.
◉ Certain conformers are called rotamers, why? Answer: They can
simply be rotated into the other conformer. Used with newman
projections
◉ Staggered vs. Eclipsed Conformers 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.
◉ How do you name newman projections? 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.
