Kaplan Organic Chemistry: Chapter 12 Separations and Purifications

Question 1

in a cation exchange chromatography set up, what charge is the column? What charged particles will elute first?

Answer 1

in cation exchange: cations will bind to the column while negative ions elute. therefore, in order for cations to be stuck in the column, the column but be NEGATIVE

Question 2

in an anion exchange chromatography set up, what charge is the column? what charged particles will elute first?

Answer 2

anion exchange exchanges ANIONS for CATIONS. therefore, in order to make anions stick to the column and let cations elute, the column must be positively charged.

Question 3

Random:

____ does not change with medium. Instead, ____changes in different mediums due to a change in speed of sound/light

Answer 3

frequency does not change with medium. Instead, wavelength changes in different mediums due to a change in speed of sound/light

Question 4

Which of the following properties of a 2.3 MHz ultrasound wave remains unchanged as it passes into human tissues?

A.Frequency
B.Wave speed
C.Amplitude
D.Wavelength

Answer 4

A. Frequency does not change with medium.

However, wave speed, amplitude and wavelength (SAW) all change according to medium properties.