IM Forces and Lab Techniques

Question 1

What are some intramolecular bonds?

Answer 1

• ionic bond
• covalent bond
• metallic bond: metal atoms bond together and have free flow e- around nuclei

Question 2

Intermolecular bonds

Answer 2

• ion-dipole
• hydrogen bonding
• dipole-dipole
• LDF

Question 3

Stronger a molecule’s intermolecular forces (3)

Answer 3

• > BP
  ->MP
  -

Question 4

Acid base extractions: How extract c-acid?

Answer 4

use NaOH or NaHCO3-

Question 5

How extract phenol?

Answer 5

NaOH

Question 6

How extract amine?

Answer 6

HCl bc + charge go into aq layer

Question 7

Why C-acid can’t dissolve in aq easy?

Answer 7

bc water prefer interact with itself especially if c-acid with aromatic group or long carbon chain

Question 8

What is distillation?

Answer 8

separate mixture of two or more volatile liquids

Question 9

Fractional distillation

Answer 9

sep liquid mixture when BP are closer together

Question 10

Recrystallization?

Answer 10

dissolve impure cmpd in hot solvent and gradually precipitate the pure compound as the solution cools down.

Question 11

What can you do to spark crystallization?

Answer 11

• seed crystal

- scratch side to cause nucleation site

Question 12

What is TLC?

Answer 12

separate compound based on solubility in solvent (polarity).

Question 13

Usually a ___ plate and a ____ solvent

Answer 13

polar & nonpolar

Question 14

compound that travels up the furthest with nonpolar solvent is

Answer 14

nonpolar

Question 15

How to calculate RF?

Answer 15

(Distance from start to middle of spot) / (distance from base to top of the solvent)