intermolecular forces

Question 1

How to know if somethng has hydrogen bondin

Answer 1

you must have molec where Hydrogen is bonded to either O,N,F
The central attoms much have lone pairs
Makes it so that the central atom with a lone pair attracts hydrogen from another atom.

Question 2

What is an intermolecular force

Answer 2

non bonding force that exist between the molecules
affect physical properties

Question 3

What is intramolecular force

Answer 3

bonding force that exist within an atom
ex covalent bonding
is very strong
affect chem properties

Question 4

What is dipole-dipole force

Answer 4

can oly happen with polar molecules
means that the molecule will change directions to that the oppositly charged ends are near to one another
- the larger the ΔEN the stronger the dip-dip force

Question 5

What is the london dispersion force

Answer 5

• both polar and non polar can have it
• is the weakest of the intermoleculer forces
  Because the electrons are floating around there are seconds where there are more electrons on one side. THis causes a temp dpole

Question 6

What 2 factors affect LDF

Answer 6

1. the amt of electrons
   - the greater the amt of electrons, the stronger the LDF
2. The effective surface area
   - the greater the surface area the stronger the LDF

Question 7

What is hydrogen bonds

Answer 7

Special case of very very strong dip dip force
come from attraction between the lone pairs on the central atom and Hydrogen atom of another molecule
Lone pair comes from N,O, F
More lone pairs= stronger H bonds

Question 8

How does H bonding affect water

Answer 8

1. High melting point
   2 Adhesive and cohesive properties (water sticks to other surfaces)
2. Hiegh specific heat
   4.High heat of vaporization
3. Water is solvant of life
4. Solid form of water is more dense than liquid water

Question 9

How do intermolcular forces affect boiling point

Answer 9

Boiling points are higher for molecules that have higher intermolecular forces

Question 10

WHich is stronger intermolecular or intramolecular forces

Answer 10

intramolecular forces are stronger,
intermolecular forces are weakere

Question 11

What factors affect LDF

Answer 11

The amount of electrons - more electrons can be on one side at once.
the effective surface area of a molecule - the greater the surface contact between molecules, the higher the LDF