The video above is a Magnesium Ribbon being set on fire. In around ten seconds the magnesium burned out and emitted a very bright light, as seen in the video. This type of reaction was a synthesis combining Magnesium with Oxygen.
This video is an example of a combustion. A small butane lighter burns butane (C4H10) and oxygen together (O). The butane caught on fire as soon as the red trigger was clicked.
This reaction showed hydrogen peroxide bubbling up, steaming & changing colour. Potassium Iodide was added to the hydrogen peroxide, but it simply sped up the process that would happen naturally in different circumstances.
This series of pictures and videos shows the progression that occurs when copper and silver nitrate are added together and mixed. The silver which was in liquid form at the beginning suddenly becomes visible as the elements react together. The final picture took around 8 1/2 minutes to take. This was the slowest reaction out of all the other 5.
This video shows potassium iodide reacting and turning yellow once lead nitrate is added. This reaction happened very quickly, as quickly as the butane set on fire.
This series of videos shows sodium hydroxide and sulfuric acid reacting together to balance each-other out. The litmus paper changes colours (or stays the same) depending on whether the solution is acidic or basic.