what is the organic solvent used in your extraction of caffeine ?

You have the choice between two organic solvents, one low boiling point and one with a high boiling point. Which one will be your choice?

In the labster experiment you have performed, what is the name of the chemical that moves from the aqueous layer into the organic layer?

When a solid reaches the temperatures of its ___, it can become a liquid.

Why did you scratch the sides of the flask with a glass rod?

Two compounds are being distilled. What is the boiling point of the compound collected first?  

If you start with a 50 mole percent solution of cyclohexane in toluene, you can see from the boiling point composition curve that the liquid will boil at around 91 oC. What would be the composition of the vapor will be approximately .    

The arrow leading from the highlighted red box identifies which structure:

Based on the volume-temperature curve shown below, was the separation of mixtures successful?  

In what situation would a chemist use distillation?