Bond and molecular polarity, intermolecular forces, gas laws
Colorado State University
6 pm in A101
7 – 9 pm in Clark
9.5, 10.3, 12.1, 12.3, 5.1, 5.3, 5.4, 5.6, 4.1, 4.2, 4.3, 3.3
Bond and molecular polarity
Which molecules are polar?
You cannot see polarity from a resonance structure. You need to make the resonance
CO 3 is trigonal planar
It’s nonpolar, but there is bond polarity
O 3s bent
No bond polarity, no polarity at all (same atom, same electronegativity)
XeF i2 linear
Nonpolar. The two polar bonds point opposite directions and cancel each other
out. Intermolecular forces
Ethylene glycol has a molar mass of 62.07 g / mol and a boiling point of 198° C.
What do you predict to be the bp of propanol with a comparable molar mass of 60.09 g /
Stronger forces in / between molecules / more force – higher boiling point
Ethylene glycol is more able to hydrogen bond compared to propanol
Boiling point of propanol is 98° C
Less than ethylene glycol
Which would have the higher boiling point?
Ne or Kr?