re trying to control them with lasers. Scientists are trying to use lasers to prod a chemical reaction that could go one way or another, the way they want it to. They want to direct the molecules in one direction. The control of photons to excite molecules and cause reactions has been elusive. Recently, though, chemist Robert J. Gordon at the University of Illinois achieved "coherent phase control of hydrogen disulfide molecules by firing ultraviolet lasers of different wavelengths at them." Laser chemistry looks promising and is a way that chemistry is still being expanded. Again, chemical reactions are the main part of a branch of chemistry.Here again, scientists are playing with chemical reactions. In April of 1995, a chemist named Peter Schultz and a physicist named Paul McEuen of the University of California at Berkly announced that they could control chemical reactions molecule by molecule. "The key to the technique is to put a dab of platinum on the microscopic tip of an atomic force microscope. (The tip of such a microscope is a tiny cantilever that rides like a phonograph needle just above the surface of a sample and reacts to forces exerted by the electrons beneath it.)" The Platinum acts like a catalyst, stimulating a reaction between two reactants, just stimulating a reaction one molecule at a time. The molecules are stimulated in a pattern giving the wanted results. This discovery opens doors for nanoengineering and material sciences. It gives a good view of what happens, one molecule at a time. Chemical reactions are a large part of chemistry. This paper is an overveiw of that extensive subject. It gives a good idea about the history of chemical reactions as well as the future. Hopefully, there will be no end to the expansion of chemistry and our knowledge. Since Scientists are still experimenting, chemical reactions will always be a part of chemistry....
