Module 4: Intermolecular Forces

Question 1

What is intermolecular forces?

Answer 1

Attractions that occur BETWEEN atoms, molecules, and ions due to their proximity

Not covalently bonded

Question 2

What are INTRAmolecular forces?

Answer 2

Covalent bonds

Question 3

What does a bond tell you?

Answer 3

How the drug is interacting with the receptor

Question 4

Blue =

Answer 4

Nitrogen

Question 5

Yellow =

Answer 5

Sulfur

Question 6

red =

Answer 6

oxygen

Question 7

black =

Answer 7

carbon

Question 8

Is O2 an intermolecular or intramolecular force?

Answer 8

INTRAmolecular

Question 9

Are 2 H2O molecules intermolecular or intramolecular?

Answer 9

Intermolecular

Question 10

T/F: Intermolecular forces are stronger than intramolecular forces

Answer 10

F

Question 11

Why do intermolecular forces APPEAR stronger?

Answer 11

Normally d/t the larger number of interactions

Question 12

There has to be a ________ to have an intermolecular force

Answer 12

closeness

Question 13

What are partial charges?

Answer 13

Not an actual charge

d/t unequal sharing of electrons

Question 14

What does Delta + mean?

Answer 14

Partial positive charge (No or less electrons)

Question 14

What does Delta - mean?

Answer 14

Partial negative charge (More electrons)

Question 15

What happens when there is a partial negative and a partial positive charge in a molecule?

Answer 15

A dipole-dipole bond is formed

Question 16

What is a dipole polar bond? vs a non polar?

Answer 16

polar: Unequal sharing of electrons

non polar: equal sharing of electrons

Question 17

How does the arrow point in the dipole dipole bonds?

Answer 17

Towards the more electronegative

Towards the Delta (-)

Towards more electrons

Question 18

T/F: If the distance is wide there can still be intermolecular forces

Answer 18

F

Question 19

The distance between intermolecular forces is very ______

Answer 19

small

Question 20

The _______ the atoms the ________ the bond

Answer 20

closer

stronger

Question 21

T/F: The stronger the attractive forces between particles, the more they resist moving.

Answer 21

T

Question 22

Name your nonpolar bonds

Answer 22

C–C
C–H

Question 23

Name your polar bonds

Answer 23

C–O
C–N
C–S
C–F
C–Cl
C–Br
C–I
H–O
H–N
H–S
P–O

Question 24

What is the electronegativity of a nonpolar bond?

Answer 24

if the difference in electronegativity is < 0.5 between bonded atoms

Question 25

What is the electronegativity of a polar bond?

Answer 25

if the difference in electronegativity is greater than 1 between bonded atoms

Question 26

T/F: Strong intermolecular forces will not break apart?

Answer 26

F

Question 27

Where does the partial negative charge reside?

Answer 27

the more electronegative atom

Question 28

What is surface tension?

Answer 28

Liquid's resistance to increase its surface area

Question 29

How does surface tension relate to intermolecular forces?

Answer 29

The stronger the intermolecular forces the more energy required to increase surface area

Question 30

How many drops of water can you put on a penny?

Answer 30

Over 100 **d/t surface tension**

Question 31

What is capillary action?

Answer 31

Spontaneous rising of a liquid in a narrow tube or the movement of a liquid up a piece of paper against the pull of gravity

Question 32

What is capillary action due to?

Answer 32

cohesive and adhesive forces

Question 33

What is viscosity?

Answer 33

Measure of a liquid's resistance to flow thickness of liquid

Question 34

Increased viscosity means a liquid doesn’t pour as ______

Answer 34

easily

Question 35

With _______ viscosity you increase the amount of energy needed to get through the fluid.

Answer 35

increased

Question 36

increased hemaocrit =

Answer 36

increased viscosity

Question 37

T/F: The bigger the atom the more potential for more intermolecular force interactions

Answer 37

T

Question 38

T/F: Drugs bind receptors through intermolecular forces rather than chemical bonds

Answer 38

T

Question 39

The way the drug binds to the receptor determines what?

Answer 39

Efficacy, potency, toxicity

Question 40

T/F: Phase changes to different phases of matter are not affected by intermolecular forces?

Answer 40

F They are directly impacted by them

Question 41

What does the phase change graph show?

Answer 41

The changes in the different phases of matter with respect to temperature and pressure

Question 42

_______ is required to disrupt molecular interactions and lead to changes in the state of matter

Answer 42

energy

Question 43

T/F: Changes is phases (state of matter) break chemical bonds

Answer 43

F They do not break chemical bonds

Question 44

When you _______ the temperature you add more energy

Answer 44

increase

Question 45

Substances with ________ polarity will be soluble

Answer 45

Similar

Question 46

______ dissolves _______

Answer 46

Like dissolves like

Question 47

What are the weakest to strongest bonds?

Answer 47

Van der Waals Forces Dipole-Dipole Interactions Hydrogen Bonding Ion-Dipole Electrostatic Interactions Covalent Bonds

Question 48

What are the bonds from strongest to weakest?

Answer 48

Covalent Bonds Electrostatic Interactions Ion-Dipole Hydrogen Bonding Dipole-Dipole Interactions Van der Waals Forces

Question 49

What is Van der Waals Forces?

Answer 49

non polar dipole Easily broken weakest intermolecular forces

Question 50

What is another name for Van der Waals?

Answer 50

London Dispersion

Question 51

Describe Dipole-Dipole interactions

Answer 51

Polar Dipole Relatively strong

Question 52

Describe Hydrogen bonding

Answer 52

Strong and specialized dipole-dipole bond Between hydrogen donor and hydrogrn acceptors

Question 53

What is a hydrogen donor?

Answer 53

Molecule providing the H **Molecule with a H

Question 54

What is a hydrogen acceptor?

Answer 54

Molecule that attracts the hydrogen N, O, F

Question 55

Describe Ion-Dipole

Answer 55

a very strong interaction between a full formal charge and a dipole

Question 56

The partial charge in O in water dissolving a dissociated Na molecule is considered?

Answer 56

Ion-Dipole

Question 57

Describe Electrostatic interactions

Answer 57

Between the cationic and anionic portion of 2 NON METALS 2 non metals that have actual formal charges Can exist at larger distances Can hold alot longer occur less often

Question 58

Describe Covalent bonds

Answer 58

Strongest Limited reversibility Seldom formed INTRAmolecular forces