Quiz 3

Question 1

Diamagnetism

Answer 1

Molecules with no unpaired electrons are weakly repelled by a magnetic field

Question 2

Paramagnetism

Answer 2

Molecules with one or more unpaired electrons are attached to a magnetic field

Question 3

Diamagnetism

Answer 3

molecules with no unpaired electrons are weakly repelled by a magnetic field

Question 4

name three features of gas

Answer 4

• expand to fill their containers
• are highly compressible
• two or more gases will form a homogenous mixture regardless of their identity

Question 5

Pressure

Answer 5

the amount of force applied to an area

Question 6

what is the relationship between the average kinetic energy of a molecule and the absolute temperature?

Answer 6

its proportional

Question 7

what is the formula for real gases?

Answer 7

n= PV/RT

Question 8

The state of a substance:

Answer 8

is a balance between kinetic energies of the particles and the inter-particles energies of attraction

Question 9

Name the four intermolecular forces

Answer 9

• London dispersion force
• dipole-dipole interactions
• hydrogen bonding
• ion dipole forces

Question 10

London Dispersion Force

Answer 10

the motion of electrons in an atom or molecule can create instantaneous or momentary dipole moments

Question 11

what is the limiting factor of dipole-dipole forces?

Answer 11

only effective at close distances

Question 12

what atoms does hydrogen bond with to form hydrogen bonds?

Answer 12

F, O, N

Question 13

Ion Dipole Forces

Answer 13

exist between an ion and a polar molecule

Question 14

Viscosity

Answer 14

the ease with which molecules of a liquid can move relative to another

Question 15

Surface Tension

Answer 15

the energy required to increase the surface area of a liquid by a unit amount

Question 16

Capillary Action

Answer 16

the ability of a liquid to flow in narrow spaces in opposition to eternal forces like gravity

Question 17

enthalpy of fusion

Answer 17

the energy required to change a solid at its melting point to a liquid

Question 18

enthalpy of vaporization

Answer 18

the energy required to change a liquid at its boiling point to a gas

Question 19

enthalpy of sublimation

Answer 19

the energy required to change a solid directly to a gas

Question 20

Critical point

Answer 20

the highest temperature at which a distinct phase can form

Question 21

Critical Pressure:

Answer 21

he pressure required to bring about liquefaction at the critical temperature

Question 22

How do the properties of liquids and solids differ from gases?

Answer 22

intermolecular interactions

Question 23

the state of a substance is a balance between what two factors?
(triangle seesaw)

Answer 23

kinetic energies of the particles and the inter-particle energies of attraction

Question 24

the strength of a dispersion force depends on what?

Answer 24

polarizability

Question 25

polarizability

Answer 25

-the ease with which the charge distribution in a molecule can be distorted (squishiness)

Question 26

Polarizability increases with...

Answer 26

increasing number of electrons

Question 27

what influences the magnitude of dispersion forces?

Answer 27

molecular shape

Question 28

what would determine that a bond is dispersion only?

Answer 28

No ions present, | No polar molecules

Question 29

what would determine that a bond is dipole-dipole only? (chart)

Answer 29

No ions There are Polar Molecules No H bonded to N,O,F.

Question 30

what would determine that a bond is a hydrogen bond?

Answer 30

No ions Polar molecules H bonded to N,O,F

Question 31

what would determine that a bond is an Ion-dipole force?

Answer 31

Ions present | Polar molecules

Question 32

what would determine that a bond is ionic?

Answer 32

Ions present, no polar molecules.

Question 33

What are factors that makes a substance viscous?

Answer 33

- the attractive forces between molecules and their shape. - viscosity increases with increased molecular weight - viscosity decreases with increased temperature

Question 34

term: the energy required to change a solid directly to a gas

Answer 34

enthalpy of sublimation

Question 35

term: the energy required to change a liquid at its boiling point to gas

Answer 35

enthalpy of vaporization

Question 36

term: the energy required to change a solid at its melting point into a liquid

Answer 36

enthalpy of fusion

Question 37

describe vapor pressure

Answer 37

the pressure exerted by the gas phase particles above the liquid (in equilibrium)