Intermolecular Forces- Dispersion/Dipole/Hydrogen

Question 1

What are intermolecular forces?

Answer 1

Forces of attraction BETWEEN Molecules

Question 2

Intermolecular Forces determine ___________ properties

Answer 2

Intermolecular Forces determine PHYSICAL properties

Question 3

Intramolecular forces are __________ than Intermolecular Forces

Answer 3

Intramolecular forces are STRONGER than Intermolecular Forces

Question 4

Dispersion Forces are the _______ of van der waals forces

Answer 4

Dispersion Forces are the WEAKEST of van der waals forces

Question 5

The Larger the molecule the stronger the dispersion forces, Why? E.g The melting points of gases increase with their atomic mass as there are stronger dispersion forces as the molecules are larger

Answer 5

There is a stronger attraction as there are more protons and electrons present.

Question 6

Dispersion forces are stronger in LINEAR or COMPACT molecules

Answer 6

LINEAR molecules have stronger dispersion forces as there is more surface interaction between molecules compared to compact shapes.

Question 7

What are Dipole- Dipole forces?

Answer 7

Dipole-Dipole forces form due to differences in the electronegativities. These Polar Bonds result in the electrons being attracted to the nucleus of a higher electronegativity.

Question 8

Dipole-Dipole Attraction is more significant for ____________ molecules.

Answer 8

Dipole-Dipole Attraction is more significant for SMALLER molecules.

Question 9

What is Hydrogen Bonding?

Answer 9

An extreme form of dipole-dipole interactions, therefore a greater strength between molecules.

Question 10

When does Hydrogen Bonding occur?

Answer 10

When Hydrogen is covalently bonded to
- Nitrogen
-Oxygen 
- Flurine
on a neighbouring molecule. 

Not the N, O, or F don’t have to be the centeral atom, only bonded to Hydrogen.

Question 11

Boiling Point ___________ with Hydrogen bonding because_____________

Answer 11

Boiling Point Increases with Hydrogen bonding because the bonds are stronger between molecules

Question 12

How can a substance without H Bonds have a higher melting point. E.g CCl4 has a higher melting point that CH3OH

Answer 12

Although Hydrogen Bonds may be present, since CCl4 is a larger molecule, it has stronger dispersion forces compared to methanol, in addition to its dipole-dipole interactions.

Question 13

In which state of matter are Intermolecular forces strongest?

Answer 13

Solid- there is a greater attraction between particles as they are held together closely.