Single Replacement Reaction Video
This video Basically explains the process of Silver Nitrate with Copper to Make Copper Nitrate and silver. Its shows how the copper turns black when it its in the solution.
Double Replacement Videos
2KI + Pb(NO3)2---->PbI2 + 2KNO3 Creates a Bright Yellow Precipitate that (Lead Iodide)
(NH4)2Cr2O7-----> Cr2O3 + N + H2O