DAT chapter 6 Flashcards
The weaker the intermolecular force in the liquid, the ____ its vapor pressure
higher
and vice versa.
the stronger the intermolecular force in the liquid, the stronger its vapor pressure.
Dipole dipole does _____ apply to ionic (metal and nonmetal) compounds. only to molecular (all nonmetal) compounds
NOT
Simple unit. how many atoms
1
body centered cubic. how many atoms
2
face centered cubic. how many atoms
4
Which of the following processes involves the greatest increase in both enthalpy and entropy
sublimination (going from solid to gas)
Strong intermolecular forces mean
- ____ boiling point
- ____ viscosity
- _____high surface tension
- _____ low vapor pressure
high
high
high
low
What is viscosity>
how thick a substance is
_____ intermolecular force = ___ viscostiy
increase
increase
(think about it) the more tightly they are bonded together, the harder its going to move
4 classes of solid
metallic
ionic
covalent
molecular
metallic solids
2 or more metals bonded to each other
ionic solids
nonmetal + metal
strong attraction between cation and anion
do not conduct electricity
Ex. Nacl and Mgo
covalent network
held together, extended network of covalent bond
do not conduct electricity
Ex. diamond/ graphite
molecular solids
held by intermolecular forces (hydrogen, dipole, dispersion bonding) soft low melting points
Ex. H20
What is it called when solids goes directly to gas
sublimation Consumes heat (endothermic) creates disorder (+delta S positive entropy)
what is it called when gas go directly to solid?
deposition Produce heat (exothermic) creates order (- delta S, negative entropy)
What is it called when solids go to liquid
melting (fusion)
what is it called when liquid goes to solid
freezing (crystallization)
What is it when gas goes to liquid
condensation
what is it when liquid goes to gas
boiling (vaporization)
When does water boil?
when the pressure exerted by the liquid molecules upward the atmosphere equals the pressure exerted by the atmosphere down upon the liquid molecule.
_increase___ in boiling point= ____ in vapor pressure
increase
decrease
_Decrease__ in boiling point = ____ in vapor pressure
increase
As elevation rises, what happens to the atmospheric temp and boiling point?
increase in atmospheric pressure
decrease in boiling point
What is triple point
all 3 phases are in equlibrium
what is the critical point
beyond this, liquids and gas are indistinguishable
is does high or low temp affect viscosity
low temp is better because the molecules move less rapidly, and the attractive forces between molecules are stronger.
The larger the molecule the ____ the dispersion force
larger
Dispersion forces are the weakest and are present in all molecules, including individual atoms, T/F
Ex
N2, Ar, Na2Co3
Ch3cl
True
Types of intramolecular forces
covalent network bonding, metallic bonding, and ion-ion bonding
