Intermolecular forces

Question 1

These are electrostatic interactions between
permanently or transiently (temporarily) charged
chemical species.

Answer 1

Intermolecular Forces

Question 2

They refer only to attractive interactions, which hold
molecules and ions together in condensed phases
(liquid and solid).

Answer 2

Intermolecular Forces

Question 3

Intermolecular Forces govern many of the bulk physicals
properties of substances and mixtures, such as
______________________

Answer 3

melting point, boiling point, and surface tension.

Question 4

These forces govern many of the bulk physical
properties of substances and mixtures, such as
melting point, boiling point, and surface tension.

Answer 4

Intermolecular Forces

Question 5

TYPES OF INTERMOLECULAR FORCES?

Answer 5

1. London Dispersion Forces (Van der Waals)
2. Dipole to Dipole Forces (Van der Waals)
3. Ion – Dipole Forces

Question 6

ION-ION FORCES, also known as __________

Answer 6

IONIC BONDING.

Question 7

These forces arise from the electrostatic attraction between two ions with opposite charges.

Answer 7

IONIC BONDING.

Question 8

Ionic Bonding Arises from what?

Answer 8

the electrostatic attraction between two ions with opposite charges.

Question 9

Intermolecular forces only refers to?

Answer 9

Attractive Interactions

Question 10

Attractive interactions does what?

Answer 10

hold molecules and ions together in condensed phases

Question 11

They are not technically considered intermolecular forces, but are a helpful starting point for understanding the true IMFs (intermolecular forces).

Answer 11

Ionic Bonding

Question 12

They are not technically considered intermolecular forces but are a helpful starting point for understanding the true IMFs (intermolecular forces).

Answer 12

Ionic Bonding

Question 13

Ionic Bonds are not technically?

Answer 13

Intermolecular Forces

Question 14

Are also generally stronger than the IMFs, which is why most
pure salts are solids except at extremely high temperatures.

Answer 14

Ionic bonds

Question 15

pure salts are solids except at?

Answer 15

extremely high temperatures.

Question 16

Table salt has a melting point of?

Answer 16

800 degrees Celcius

Question 17

WEAKEST intermolecular forces

Answer 17

London Dispersion Forces

Question 18

✓ The more electrons a molecule has, the stronger the what?

Answer 18

London dispersion
forces are.

Question 19

The breaking of London dispersion forces doesn’t require that much what?

Answer 19

Energy

Question 20

All molecules experience London Dispersion Forces (LDFs).true or false?

Answer 20

True

Question 21

Are the only IMFs that exist between noble gases and
molecules that are non-polar.

Answer 21

Dispersion Forces

Question 22

These forces occur when the partially positively charged part of a molecule interacts with the partially negatively charged part of the neighboring molecule.

Answer 22

Dipole to Dipole Forces

Question 23

These forces occur when the partially positively charged part of a molecule interacts with the partially negatively charged part of the neighboring molecule.

Answer 23

Dipole to Dipole Forces

Question 24

Are the STRONGEST
the intermolecular force of attraction.

Answer 24

DIPOLE-DIPOLE INTERACTIONS

Question 25

a special kind of dipole-dipole interaction that occurs specifically between a hydrogen atom bonded to either an OXYGEN, NITROGEN, OR FLUORINE ATOM.

Answer 25

Hydrogen Bonding

Question 26

Is a relatively strong force of attraction between molecules, and considerable energy is required to break hydrogen bonds.

Answer 26

Hydrogen Bonding

Question 27

Are responsible for holding nucleotide bases together in DNA and RNA.

Answer 27

hydrogen bonds

Question 28

Attraction between an ion and a polar molecule.

Answer 28

Ion

Question 29

Ions are very similar to ionic bonds, but tend to be weaker because polar molecules only possess _________________, which generates less electrostatic attraction.

Answer 29

partial electric charge

Question 30

Because of these forces, polar solvents are better able to dissolve ____________ such as NaCl, compared with nonpolar solvents.

Answer 30

ionic solids

Question 31

Are better able to dissolve ionic solids

Answer 31

polar solvents

Question 32

Because of these forces, polar solvents are better able to dissolve ionic solids such as NaCl, compared with nonpolar solvents.

Answer 32

Ion

Question 33

there is no what?

Answer 33

permanent dipole on the molecule.

Question 34

Can induce a dipole in the neighbouring molecule, which then interacts with the original transient dipole.

Answer 34

Transient dipole

Question 35

PROPERTIES OF SUBSTANCES AFFECTED BY INTERMOLECULAR FORCES (IMFs)

Answer 35

1. VISCOSITY 2. SURFACE TENSION 3. BOILING POINT 4. MELTING POINT 5. SOLUBILITY

Question 36

This is a measure of its resistance to flow of a liquid.

Answer 36

VISCOSITY

Question 37

The more structurally complex are the molecules in a liquid and __________________, the more difficult it is for them to move past each other and the________________

Answer 37

the stronger the IMFs between them, greater is the viscosity of the liquid.

Question 38

This is the energy required to increase the surface area of a liquid, or the force required to increase the length of a liquid surface by a given amount.

Answer 38

SURFACE TENSION

Question 39

Surface tension results from the ____________ between molecules at the surface of a liquid, and it causes the surface of a liquid to behave like a stretched rubber membrane.

Answer 39

Cohesive forces

Question 40

Force attracting water molecules to each other.

Answer 40

Cohesion

Question 41

capillary action—when a liquid flows within a porous material due to the attraction of the liquid molecules to the the surface of the material and to other liquid molecules.

Answer 41

Capillary Action

Question 42

can also occur when one end of a small diameter tube is immersed in a liquid.

Answer 42

Capillary Action

Question 43

is the temperature at which the vapor pressure becomes equal to the pressure exerted on the surface of the liquid.

Answer 43

Boiling Point

Question 44

as bonds become more polarized, the charges on the atoms become _______, which leads to _____________, which leads to___________________

Answer 44

greater, greater intermolecular attractions, higher boiling and melting points.

Question 45

The rule “______________” is applied on the concept of SOLUBILITY of molecules.

Answer 45

like dissolves like

Question 46

Polar solutes dissolve in _____________

Answer 46

Polar solvent

Question 47

nonpolar solutes dissolve in __________.

Answer 47

nonpolar solvents