Ž¯  Explain what chromatography is in general and paper chromatography specifically ,  the theory behind it , and why we’re using it here .
Ž¯  Explain what a mobile phase is and explain what a stationary phase is .
Ž¯  Why do some analytes move faster than others?
Ž¯  Include hypothesis   (or purpose  from above )
Equations or chemical reactions: Sometimes are required in the introduction if they are fundamental to understand the background of the experiment.  In this  experiment there is  only one simple equation (Rf)  that would be presented in the introduction if you discuss it there .