Chem 120 Unit 3 Test Questions with
Complete Solutions
electronegativity trend increases up and to the right
nonpolar polarity for equal pull for covalent bond
polar polarity for nonequal pull for covalent bond
very polar Is ionic polar or nonpolar?
intramolecular forces bonding forces within a compound that hold the atoms together
intermolecular forces forces of attraction between neighboring molecules/atoms
intra within
inter between
,london dispersion forces weakest IMF that exists in all substances but is the only force in
nonpolar substances
IMFs What increases with increasing molecular weight?
dipole-dipole forces forces of attraction between polar molecules, stronger than dispersion
boiling point When MW increases and strength of IMFs increase, what also increases?
hydrogen bonds very strong type of dipole-dipole force; only to FON elements; very high
bps
ionic bond strongest IMF between a metal and a nonmetal
D, DD, H, I list the IMFs from weakest to strongest by letter
saturated/trans fat What type of fat is straighter in structure and packs better?
, unsaturated fat What type of fat does not pack well as their structure contains "bends" (at
least one double bond)?
63 C What is the melting point of saturated/trans fat?
-5 C What is the melting point of unsaturated fat?
endothermic What type of reaction is the enthalpy of vaporization?
Hvap Liquid to gas (heat of vaporization)
Hfus Solid to liquid (heat of fusion)
q = (m)(SH)(delta t) What is the formula for change in temperature?
q = (m)(Hvap or Hfus) What is the formula for the phase change?
Complete Solutions
electronegativity trend increases up and to the right
nonpolar polarity for equal pull for covalent bond
polar polarity for nonequal pull for covalent bond
very polar Is ionic polar or nonpolar?
intramolecular forces bonding forces within a compound that hold the atoms together
intermolecular forces forces of attraction between neighboring molecules/atoms
intra within
inter between
,london dispersion forces weakest IMF that exists in all substances but is the only force in
nonpolar substances
IMFs What increases with increasing molecular weight?
dipole-dipole forces forces of attraction between polar molecules, stronger than dispersion
boiling point When MW increases and strength of IMFs increase, what also increases?
hydrogen bonds very strong type of dipole-dipole force; only to FON elements; very high
bps
ionic bond strongest IMF between a metal and a nonmetal
D, DD, H, I list the IMFs from weakest to strongest by letter
saturated/trans fat What type of fat is straighter in structure and packs better?
, unsaturated fat What type of fat does not pack well as their structure contains "bends" (at
least one double bond)?
63 C What is the melting point of saturated/trans fat?
-5 C What is the melting point of unsaturated fat?
endothermic What type of reaction is the enthalpy of vaporization?
Hvap Liquid to gas (heat of vaporization)
Hfus Solid to liquid (heat of fusion)
q = (m)(SH)(delta t) What is the formula for change in temperature?
q = (m)(Hvap or Hfus) What is the formula for the phase change?
