chemistry

1) Under what conditions can a good separation be achieved with a simple distillation? 

2) Explain what effect each of the following mistakes would have on the success of a distillation. )

a. No boiling stones.  

b. The thermometer is positioned too high.  

C. The flask is strongly heated (high rate of heating) and the distillation occurs too quickly. 

3) What is the trend between the boiling point difference of a two-component mixture and the number of theoretical plates required in a column?  Based on this data, how many theoretical plates does a simple distillation column have?