Chemistry Unit 3

10/22, 10/27

Stronger interparticle interactions mean stronger IMF, so they’re harder/easier to break

harder

Stronger IMF leads to ____ boiling points/melting points, ___ vapor pressures/volatility, _____ viscosity

higher, lower, higher

Polarity

Uneven e- distribution between two atoms in a molecule/throughout entire molecule

Polarizability

Degree to which molecule is affected by attractive/repulsive forces

More susceptible to being polarized, less susceptible to being polarized (IMF)

greater, less

Polarizability is generally larger with ___ electrons over a ____ volume and a ____ exposed area 

more, larger, more

LDF (generally weak)

temporary uneven distributions of e-

What are LDFs in nonpolar molecules

how they experience IMFs

What are LDFS in polar molecules

they make existing IMFs (dipoles) stronger

Longer surface area = ___ IMFs/LDFs and shorter surface area = ___ IMFs/LDFs

More, less

Branching (side chains from main molecule) reduces/increases effective contact area of molecule interaction and dec/inc IMFs

reduces, decreasing

Size and electrons inc. polarizability (increasing IMFs). which is more important and is it based on mass or being spread out?

Size, spread out

high vapor pressure/volatility means that gas is what than liquid so easy/hard to boil, so there’s stronger/weaker IMFs

greater, easy, weaker

low vapor pressure/volatility means that gas is what than liquid so easy/hard to boil, so there’s stronger/weaker IMFs

less, hard, strong

LDF/dispersion impacts ___ molecules, dipole-dipole only impacts ____. LDFs or dispersion/dipole-dipole are temporary/permanent and weaker/stronger respectively

all, polar, temporary and weaker, permanent and stronger

Hydrogen bond is a H-bond dipole-dipole interaction between H and…

N,O, F

Weakest to strongest: LDF/dispersion, H-bonding, dipole-dipole

LDF/dispersion, dipole-dipole, H-bonding