Question

7 Freezing points are difficult to determine because of the phenomenon of ___________
Impurities
Refridgeration
Supercooling
None of the above
8 What is the meaning of "oiling out" during recrystallization?
Compound melts before dissolving
Compound dissolves before melting
Compound turns to oil
Compound sublimes
9 Insoluble impurities have ______________ effect on the melting pont.
little
no
maximum
minimum

Answer 1

7. Supercooling
8. Compound turns to oil
9. Little