DAT chapter 6

Question 1

The weaker the intermolecular force in the liquid, the ____ its vapor pressure

Answer 1

higher

and vice versa.
the stronger the intermolecular force in the liquid, the stronger its vapor pressure.

Question 2

Dipole dipole does _____ apply to ionic (metal and nonmetal) compounds. only to molecular (all nonmetal) compounds

Answer 2

NOT

Question 3

Simple unit. how many atoms

Answer 3

1

Question 4

body centered cubic. how many atoms

Answer 4

2

Question 5

face centered cubic. how many atoms

Answer 5

4

Question 6

Which of the following processes involves the greatest increase in both enthalpy and entropy

Answer 6

sublimination (going from solid to gas)

Question 7

Strong intermolecular forces mean

• ____ boiling point
• ____ viscosity
• _____high surface tension
• _____ low vapor pressure

Answer 7

high
high
high
low

Question 8

What is viscosity>

Answer 8

how thick a substance is

Question 9

_____ intermolecular force = ___ viscostiy

Answer 9

increase
increase
(think about it) the more tightly they are bonded together, the harder its going to move

Question 10

4 classes of solid

Answer 10

metallic
ionic
covalent
molecular

Question 11

metallic solids

Answer 11

2 or more metals bonded to each other

Question 12

ionic solids

Answer 12

nonmetal + metal
strong attraction between cation and anion
do not conduct electricity
Ex. Nacl and Mgo

Question 13

covalent network

Answer 13

held together, extended network of covalent bond
do not conduct electricity
Ex. diamond/ graphite

Question 14

molecular solids

Answer 14

held by intermolecular forces (hydrogen, dipole, dispersion bonding) soft low melting points
Ex. H20

Question 15

What is it called when solids goes directly to gas

Answer 15

sublimation
Consumes heat (endothermic)
creates disorder (+delta S positive entropy)

Question 16

what is it called when gas go directly to solid?

Answer 16

deposition
Produce heat (exothermic)
creates order (- delta S, negative entropy)

Question 17

What is it called when solids go to liquid

Answer 17

melting (fusion)

Question 18

what is it called when liquid goes to solid

Answer 18

freezing (crystallization)

Question 19

What is it when gas goes to liquid

Answer 19

condensation

Question 20

what is it when liquid goes to gas

Answer 20

boiling (vaporization)

Question 21

When does water boil?

Answer 21

when the pressure exerted by the liquid molecules upward the atmosphere equals the pressure exerted by the atmosphere down upon the liquid molecule.

Question 22

_increase___ in boiling point= ____ in vapor pressure

Answer 22

increase

decrease

Question 23

_Decrease__ in boiling point = ____ in vapor pressure

Answer 23

increase

Question 24

As elevation rises, what happens to the atmospheric temp and boiling point?

Answer 24

increase in atmospheric pressure

decrease in boiling point

Question 25

What is triple point

Answer 25

all 3 phases are in equlibrium

Question 26

what is the critical point

Answer 26

beyond this, liquids and gas are indistinguishable

Question 27

is does high or low temp affect viscosity

Answer 27

low temp is better because the molecules move less rapidly, and the attractive forces between molecules are stronger.

Question 28

The larger the molecule the ____ the dispersion force

Answer 28

larger

Question 29

Dispersion forces are the weakest and are present in all molecules, including individual atoms, T/F Ex N2, Ar, Na2Co3 Ch3cl

Answer 29

True

Question 30

Types of intramolecular forces

Answer 30

covalent network bonding, metallic bonding, and ion-ion bonding