Unit 3 Day 1 Flashcards
Intra
Within
Inter
Between
Intra or inter stronger
Intra(within) is stronger
Intra forces
IMF
Ionic
Covalent
Inter forces
IMF
Ion ion
Dip dip
H bond
LDF
Strongest lattice energy
Charge/ radius
High charge then small radius
Polar molec attract other molec
Electrostatically
Strongest dipole interactions means
Most polar
Np molec can attract other np molec
Electrostatically
Polarizability
Measure of how easily the electron cloud can be distorted
What IMF is the only one with a full charge
Ion ion
What is the only IMF type with temp dip
LDF
What does dissolving salt in water do(what imf)?
Ion-dip
All physical properties of solids and liquids are determined by?
IMFS
What IMF is for gases
No IMF with ideal gas
Strong IMF =(BP?)
High BP
Strong IMF =
VAPOR?
low vp
what determines pressure
The number of Molecules colliding with the wall of the vacuum box
What is pressure(formula)
Force over area
What is VP
A physical property of a liquid
When can VP be determined
The rate of condensation equals the rate of evaporation
Cohesive forces
How attracted it is to itself, attractions between same molecules
Adhesive forces
How attracted it is to container, attractions between diff molec
What must be true for concave meniscus
Adhesive forces are greater than cohesive forces
Which molecules has higher energy
Surface of bulk molecule?
Surface molecules do, they are less stable
What is viscosity
Resistance to flow
What is more viscous
(Size)
Larger molecules
What is more viscous
Temp
Cold
What is more viscous
Polarizability
More polarizable is more viscous
Melting point
The temp at which imfs break and distance btwn molec increase
4 types of solids
Ionic
molecular
covalent network
Metallic
Ionic solids
Hard, rigid, high MP
Conduct electricity when dissolved in water
Btwn cations and anions
Molecular solids
Melting points below 500k
Are brittle
Don’t conduct electricity
Covalent network
Melting points above 500k, hard, insoluble in water
High imfs =?
mp
High melting pt
Metallic solids
Held by metallic bonds only, malleable and ductile, good thermal and electrical conductors
What imf do ion have
Ion ion
What IMF do molecular have
H bond, dip dip, LDF
What bonds do covalent networks have
Covalent bonds
What bonds do metallic solids have
Dative bonds
Polarizability increases with?
Increasing number of electrons so therefore increasing size of molecules
LDF are usually stronger for…
Molecules that are larger with more electrons
What are instantaneous dipoles
LDF
What IMF do all molec have
LDF
What do IMFS result from
Attractive forces between regions of positive and negative charge density in neighboring molecules
Coloumbs law theory
The closer 2 charges are(3+ and 3- vs 1+ and 1-) the stronger the force between them
Coloumbs law equation
Electric force equals columb constant(k) times charge 1 and charge 2 divided by the distance btwn the 2 charges squared
What do solid lines represent
Covalent bonds
Where do h bonds happen
Between 2 diff molecules(inter)
Are covalent bonds stronger than h bonds
Yes Intramolecular(within) is stronger than intermolecular (between)
If a molecule is np what IMF can it have
ONLY dispersion
if at same temp pressure and vol which has greater number of collisions, He or O2 and why
He because it is less big and therefore moves with a higher velocity
What imf contributes to physical properties of substance
Intermolecular
What imf holds molecules together
Intramolecular
When adhesive forces are greater than cohesive forces, a liquid will tend to try to wet the surface. This means the liquid will maximize attractive forces my
Maximizing contact with the surface
When the cohesive forces are greater than the adhesive forces, a liquid will tend to bead on the surface. The liquid will maximize attractive forces by
Minimizing contact with the surface
A property of liquid thats arise because molecules at the surface have a higher energy(less stable) than the molecules in the middle of the liquid
Surface tension
Round droplet means
Strong attractive forces, IMF
SATP
1 bar and 25 degrees C
Percent yield
Lab ver stcich
