Types and Effects of Intermolecular Forces

Question 1

Intramolecular forces? 3 types?

Answer 1

forces WITHIN a molecule itself that keep a molecule together. 1) Metallic, 2) Ion-Ion, and 3)
covalent network

Question 2

Intermolecular forces?

Answer 2

Are forces that keep one molecule sticking to another molecule. The stronger the force, the more intensely molecules are attracted to each other

Question 3

4 types of intermolecular forces?

Answer 3

1) ion-dipole
2) hydrogen bonding
3) dipole-dipole
4) dispersion forces (Van der Waals)

Question 4

Ion-dipole Intermolecular force

Answer 4

intermolecularforce between ions and polar substances (NaCl in water)

Question 5

hydrogen bonding intermolecular force

Answer 5

N-H, F-H, O-H bond in a pure substance

Question 6

Dipole-dipole intermolecular force?

Answer 6

intermolecular force between POLAR non-ionic molecules that do NOT have an H bonded to O, N, or F

Question 7

Dispersion Forces (or called London or van der Waals forces)

Answer 7

this is the intermolecular force between all molecules. Temporary dipole includes polar and nonpolar molecules. The greater the weight, the greater the London dispersion forces

Question 8

list dipole-dipole, dispersion forces, and hydrogen bonding in order of increasing strength?

Answer 8

dispersion forces, dipole-dipole, hydrogen bonding, and ion-dipole

Question 9

Can dispersion forces occur in individual atoms as well?

Answer 9

yes

Question 10

If you have two molecules that only have dispersion forces, how do you know which one has more forces?

Answer 10

The larger molecule

Question 11

If you have two molecules that only have dispersion forces, which one has a higher boiling point?

Answer 11

The larger molecule, bc the stronger the intermolecular force the higher the boiling point

Question 12

All molecules have what type of intermolecular force?

Answer 12

dispersion forces

Question 13

What is the weakest intermolecular force?

Answer 13

dispersion forces

Question 14

strong IM forces indicate 4 properties?

Answer 14

1) high boiling point (high heat of vaporization)
2) high viscosity
3) high surface tension
4) low vapor pressure

Question 15

viscosity

Answer 15

how thick a substance is. The thicker a substance, the more slowly it pours.
Ex: molasses is more viscous than water

Question 16

vapor pressure

Answer 16

upward pressure exerted by a substance on the atmosphere (or against atmospheric pressure)

Question 17

When does boiling occur?

Answer 17

when the vapor pressure of a liquid substance equals or exceeds atmospheric pressure

Question 18

IM forces and vapor pressure are directly or indirectly related?

Answer 18

indirectly

Question 19

Would water boil faster on top of a mountain or in the grand canyon?

Answer 19

Top of a mountain. Bc atmospheric pressure decreases with higher altitude causing a lower boiling point

Question 20

Why would vapor pressure decrease as boiling point increases?

Answer 20

If something has a high boiling point. that means it has a low vapor pressure bc it requires MORE HEAT to makes the vapor pressure high enough to allow boiling

Question 21

what is atmospheric pressure at sea level?

Answer 21

1 atm. BP of water at sea level is 100 degrees C

Question 22

Vapor pressure and boiling point are related how?

Answer 22

indirectly. higher vapor pressure=lower BP