Practical chemical:
I think that chemistry is a very interesting and important practical disciplines and scientific fields. Itexists in our lives all the time. There are already hundreds of different physiological and chemical activities just in your body: red blood cells transport oxygen, DNA replication, digestion and absorption ... the use of the chemical can also manufacture of nuclear weapons, a variety of drugs, plastics and all sorts of industrial supplies for human need. Chemistry also has many interesting chemical reactions, such as: reduction reaction, oxidation, condensation, polymerization, esterification and the silver mirror reaction etc. However, there is danger of the energy on Earth may one day be consumed, therefore chemistry came in handy. Solar energy not only has the "inexhaustible, unlimited features, and the sun produces solar energy far exceeds the Earth energy consumption, so it is also superior than other clean energy. Study the photosynthesis of green plants, study film photo-sensitivity, and raised only be able to efficiently convert solar energy into electrical energy photoelectric conversion materials and devices, chemical and other science and technology will solve the problems we are facing a huge contribution. So let us learn all the science and technology, to save this beautiful but fragile Earth!