Tetrachlorethylene at room temperature is a non-flammable liquid. It is easy to evaporate into the air, with a stimulus, sweet smell. Exposed to very high concentrations of PCE can cause dizziness, headache, drowsiness, confusion, nausea, difficulty speaking and walking, unconsciousness, and death. PCE is stored as fat in the body in the use of tetrachlorethylene, and is slowly released into the blood, tetrachlorethylene in the weeks after the severe exposure can be detected in the breath. Most of the PCE will enter the water or soil PCE price quotes, then evaporated into the air. Some microbes can break down the soil or groundwater PCE. In the air, tetrachlorethylene, PCE will be broken sunlight for other chemicals, or by rain and then back to the soil and water. This book discusses the relationship between structure and properties of organic compounds on the basis of knowledge as the main theme in the discussion of the integrated use of molecular orbital theory, electron theory, quantum chemistry theory and theory of resonance, and, in some sections of the discussion, there is a brief mention conscious and the development of certain theories in the field to enhance the reader's interest. Topics in the book can be roughly divided into three areas, namely: Organic quantitative relationship between molecular structure and chemical activity; the organic chemistry of reactive intermediates and organic chemical reactions course; the course is different from the classic reaction of pericyclic reactions and organic photochemistry. In the process of writing this book as much as possible the recent development of content and ideas covered included, presented the results of recent years and the theoretical organic chemistry in organic photochemistry, organic supramolecular chemistry, organic chemistry and biophysical chemistry made of organic materials. Xiang dry chemical (Figure), tetrachlorethylene manufacturers, Langfang PCE dry by Jinan Cheung Chemical Limited. Jinan Cheung Dry Chemical Co. (www.xiangqianhuagong.com) (www.dilunyierchun.com) adhere to the "people-oriented" business philosophy, has a professional staff, and strive to provide the best products and services to contribute to the community, and welcome to new and old customers to visit us and sincere cooperation for a better future. Xiang dry chemical - your trusted friend, Company Address: Industrial Road chemical market, Contact: Mr. You can also access (www.dilunyierchun.com/supply_details_42022930.html), for more information about the company.