MELTING POINT PRELAB

NAME: _____________________________________________________________
 

  1. Name three convenient OFF-LINE sources of data concerning the physical constants and properties of organic compounds.  ("The Internet"  is not an acceptable answer)

 
 
 
 
 
 
 
 
  1. True or false
  1. An impurity raises the melting point of an organic compound. ________________
    If a substance has a sharp melting point, then the substance must be pure ________________
 
  1. The sample should fill about 5 - 10 mm of the capillary tube, and it should be loosely packed. __________
  1. The rate of heating should be about one or two degrees per minute near the melting point of the compound. _________

 An unknown (U) can be one of two possible compounds, A & B. The two compounds both have the same melting point.  Two mixed melting point capillary tubes are set up side by side, U+A on the left & U+B on the right.
The mixture on the left melts first.  What is the unknown, A or B? Explain briefly.