Question

The distance that a spot of a particular compound moves up the TLC plate relative to the distance moved by the solvent is called the Rf
value. What does Rf stand for?

   a.   Refractive factor

   b.   Reflux fashion

   c.   Raoult’s factor

   d.   Retention factor

1 points   

QUESTION 2

The components of an immiscible mixture boil at _________________.

   a.   higher temperatures than the boiling points of the individual components of the mixture

   b.   a temperature that is exactly in between the boiling point of the individual components of the mixture

   c.   lower temperatures than the boiling points of the individual components of the mixture

   d.   the boiling point of water, which is 100°C.

1 points   

QUESTION 3

Generally speaking ____________ compounds tend to elute off the column first.

   a.   polar

   b.   acidic

   c.   non-polar

   d.   basic

QUESTION 4

TLC stands for _____________.

   a.   Tender Loving Care

   b.   The Least Concentrated

   c.   Thin Layer Chromatography

   d.   The Learning Channel

QUESTION 5

In order for steam distillation to be effective, the organic compounds in the mixture must be _____________.

   a.   miscible with water

   b.   less dense than water

   c.   immiscible with water

   d.   more dense than water

QUESTION 6

Which one of the following solvents is the most polar?

   a.   toluene

   b.  ethanol

   c.  diethyl ether

d.   acetone

QUESTION 7

An efficient separation employing GC include all of the following except_____________.

   a.   temperature of the column

   b.   diameter of the column

   c.   volatility of the compound

   d.   length of the column

Answer 1