Unit 3.2 Flashcards
vapor pressure
the tendency to evaporate
higher vapor pressure=
weaker IMF
bc with weaker attractive forces, they can vaporize more so, higher vapor pressure
stronger forces=
higher boiling point, lower vapor pressure
how are ionic solids formed
strong interactions between ions
ionic solid vapor pressure
low vapor pressure
(dont evaporate easily)
ionic solid boiling point and characteristics
- high melting point
-brittle (from repulsions of like charges when ions shift)
covalent solids
-strong IMF
-high melting points
-hard: diamond (structure is fixed)
-soft: graphite (layers slide past each other)
covalent: share valence electrons
Molecular solids
-weak IMF
-low melting points
-no electricity
Metallic solids
-made of metal atoms where valence electrons allow them to conduct electricity and heat
-malleable
-ductile (stretched)
-in interstitial alloys (smaller atoms fill in the spaces between) decreases malleability and ductility
Large biomolecules or polymers
noncovalent: occurs in large molecules (like proteins or DNA)
shape depends on noncovalent interactions (like hydrogen bonds)
dynamic equilibrium
a point reaches in a sealed container in which the rate of evaporation is equal to the rate of condensation
When temperature increases…
kinetic energy increases
causing evaporation
low vapor pressure=
strong IMF
bc tendency to evaporate means higher boiling point which means stronger
high vapor pressure in relation to boiling point
low boiling point
low vapor pressure in relation to boiling point
high boiling point
the boiling point of a liquid is defined as
the temp at which the vapor pressure of the liquid is equal to the external pressure surrounding the liquid
Covalent Network examples
diamond (C)
Graphite (C)
Silicon (Si)
Quartz (SiO2)
Silicon Carbide (SiC)
boron nitride (BN)
lighting a candle is what type of change
chemical change
The “colorless gas” propane cannot be liquified at temperatures above 97 °C
is the quoted part a physical or chemical property
physical
examples of physical properties
color, state, density, melting point and boiling point.
vapor pressure decreases as temp____
decreases
2 elements
1st: vapor pressure= 400 temp= 50
2nd: vapor pressure=400 temp=28
which one will have a higher vapor pressure at 15 degrees
the 2nd bc its lower at the same temp so the pressure will decrease less than the first one
vapor pressure and temp relationship
congruent
vapor pressure and strength relationship
inverse
which ones stronger covalent or molecular solids
covalent (diamond,quartz)
