:)
what would a potential energy diagram look like for an exothermic reaction? explain.

An exothermic reaction releases energy, so you're going to end with less energy than you started with. The graph will increase as the reaction reaches the activated complex and then will fall to somewhere lower than the reactants depending on what the reaction is.

Icant see the pictures 

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.