homologous series Flashcards

1
Q

what is the polarity of hydrocarbons?

A

non-polar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What intermolecular force is present in alkanes?

A

only LDF

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the trend in boiling/melting points of alkanes?

A

as molar mass of alkanes increases so does the melting point.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Explain the reason for the trend in the boiling/melting point of alkanes.

A

higher molar mass = more contact surface + greater LDF = increased melting/boiling points

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are the three factors that determine what type of intermolecular force exist between molecules?

A
  • molar mass
  • straight-chained or branched structure
  • functional group present
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which structure often has a stronger intermolecular force, straight-chained or branched ones?

A

straight-chained

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Why do straight-chained molecules have stronger intermolecular forces than branched ones?

A
  • branches prevent molecules from getting close together = less surface area contact
  • Straight allows molecules to get close = more surface area contact
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Name two classes that have dipole-dipole forces between their molecules

A
  • aldehydes
  • ketones
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Name two classes that have hydrogen bonds between their molecules

A

alcohols, carboxylic acids and amides

How well did you know this?
1
Not at all
2
3
4
5
Perfectly