CHEM210 / CHEM 210 Module 2
(Latest Update )
Biochemistry | Questions & Answers
| Grade A | 100% Correct - Portage
Learning
Aqueous solutions: Water and Buffers
Question:
Why does hexane have a lower BP, MP, an heat of vaporization if it is much
larger than water?
Answer:
because it does not contain any intermolecular forces (besides for london
forces) which would cause higher bp, mp, and heat of vapor
Question:
Which molecules do dipole attraction occur in?
Answer:
polar molecules- when a permanent dipole is present with a partial + an a
partial - side (example: acetone/glucose)
,Question:
What are the 3 types of non covalent forces?
Answer:
london forces
dipole dipole
hydrogen bonds
Question:
What are some unique qualities of water?
Answer:
1. liquid has higher density than solid
2. high heat compacity (it absorbs lots of heat before going to
3. doesn’t taste good on its own, only with salts/ions
4. attractive properties with itself and other molecules
Question:
Which molecules do london forces attraction occur in?
Answer:
all molecules, polar and non polar- this is due to a random shift in electrons
which causes a temporary dipole
,Question:
What is Coulomb's Law?
Answer:
forces= a constant (k) * partal +*partail -/ divided by distance^2 (R)
Question:
How great of an electron difference dos there have to be to be considered
polar?
Answer:
greater than 1.8 dif in electronegativity
Question:
What does the intermolecular forces do to the MP, BP, and heat of vapor?
Answer:
it raises all of them
Question:
Which is the strongest non covalent force
Answer:
hydrogen bonds are a special type of dipole dipole force which is the strongest
, Question:
What is required for a hydrogen bond to form?
Answer:
a H donor and an H acceptor
Question:
What are example of an H donor?
Answer:
a hydrogen attached to a F,N, or O
Question:
What are example of an H acceptor?
Answer:
A lone pair of electrons on a N, F, or O
Question:
Why can only F, N, and O be used for hydrogen bonding?
Answer:
because their electronegativity difference with the H creates a partial + and -
(Latest Update )
Biochemistry | Questions & Answers
| Grade A | 100% Correct - Portage
Learning
Aqueous solutions: Water and Buffers
Question:
Why does hexane have a lower BP, MP, an heat of vaporization if it is much
larger than water?
Answer:
because it does not contain any intermolecular forces (besides for london
forces) which would cause higher bp, mp, and heat of vapor
Question:
Which molecules do dipole attraction occur in?
Answer:
polar molecules- when a permanent dipole is present with a partial + an a
partial - side (example: acetone/glucose)
,Question:
What are the 3 types of non covalent forces?
Answer:
london forces
dipole dipole
hydrogen bonds
Question:
What are some unique qualities of water?
Answer:
1. liquid has higher density than solid
2. high heat compacity (it absorbs lots of heat before going to
3. doesn’t taste good on its own, only with salts/ions
4. attractive properties with itself and other molecules
Question:
Which molecules do london forces attraction occur in?
Answer:
all molecules, polar and non polar- this is due to a random shift in electrons
which causes a temporary dipole
,Question:
What is Coulomb's Law?
Answer:
forces= a constant (k) * partal +*partail -/ divided by distance^2 (R)
Question:
How great of an electron difference dos there have to be to be considered
polar?
Answer:
greater than 1.8 dif in electronegativity
Question:
What does the intermolecular forces do to the MP, BP, and heat of vapor?
Answer:
it raises all of them
Question:
Which is the strongest non covalent force
Answer:
hydrogen bonds are a special type of dipole dipole force which is the strongest
, Question:
What is required for a hydrogen bond to form?
Answer:
a H donor and an H acceptor
Question:
What are example of an H donor?
Answer:
a hydrogen attached to a F,N, or O
Question:
What are example of an H acceptor?
Answer:
A lone pair of electrons on a N, F, or O
Question:
Why can only F, N, and O be used for hydrogen bonding?
Answer:
because their electronegativity difference with the H creates a partial + and -
