Chapter 2

Question 1

What is special about the dipole formed by C-H?

Answer 1

It is very weak, so it is usually not shown

Question 2

List the three types of IMF in order of strength

Answer 2

Hydrogen bonding, Dipole-dipole, LDF

Question 3

Describe hydrogen bonding

Answer 3

Occur when strong electronegative atoms (N, O, F) are attached to H
Indicated by dotted lines leading to another atom’s N, O, or F

Question 4

Connect molecular weight to LDF

Answer 4

The higher the molecular weight, the stronger the LDF`

Question 5

Connect BP and strength of IMFs

Answer 5

The stronger the inter-molecular forces, the higher the BP

Question 6

What arrangement will give a lower BP?

Answer 6

Spherical molecules and molecules with high branching have lower BPs

Question 7

What is the only solubility rule we have to know?

Answer 7

Polar solvents dissolve polar molecules and so on

Question 8

Use Hooke’s law to connect K/F, mass of atoms, and wavenumber

Answer 8

The higher the K/F, the stronger the bond and the higher the wavenumber

The lighter the atom, the higher the wavenumber

Question 9

How does resonance affect wavenumber?

Answer 9

When a molecule has more resonance structures with single bond character in a functional group, the wavenumber will be lower due to the weaker bond

Question 10

What do you do when you are writing structures from molecular formulas and you don’t have enough hydrogens?

Answer 10

Throw in double bonds and rings