Chemistry is a very broad subject that has been divided into many special fields. Analytical chemistry determines the kind and amount of each element or compound present in a substance. Biochemistry is the study of chemical composition of living matter and the chemical process that occurs in living organisms. Chemical engineering is a field that combines chemistry and engineering to develop or improve industrial processes. Colloid chemistry is the study of the behavior of particles of matter that are larger than ordinary molecules but smaller than objects that can be seen with an optical microscope. Electrochemistry is the study of chemical reactions that produce an electrical current. Carbon and its compounds are studied in organic chemistry. Elements and compounds that do not contain carbon are studied in inorganic chemistry. Nuclear chemistry studies the radioactivity, atomic nucleus, and nuclear reactions, and the development for radioactive isotopes in medicine and industry. Physical chemistry applies physical methods to the study of chemical problems. A chemist intends to comprehend how the universe is put together and how its substances can be changed to meet mankind's needs. All things can be classified as matter or energy and one can be converted to the other. Matter can also be classified by its physical state and according to its composition; matter also consists of particles in motion. Chemists have discovered that the whole universe is made up of more than 90 molecules. Chemistry involves the study of these elements, and is used to help in technology for human welfare. Many people don't seem to realize how many things they use every day have something to do with chemistry. There are many fields that involve chemistry, but for those that aren't involved in these fields, it is good to have some knowledge of the field to be able to appreciate what it has done to make your life as simple as it is today....
