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Hace 2 días · The history of chemistry represents a time span from ancient history to the present. By 1000 BC, civilizations used technologies that would eventually form the basis of the various branches of chemistry.
Hace 2 días · What is chemistry? How are chemistry and biology related? chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
Hace 1 día · Chemical reactions are described with chemical equations, which symbolically present the starting materials, end products, and sometimes intermediate products and reaction conditions. Chemical reactions happen at a characteristic reaction rate at a given temperature and chemical concentration.
Hace 1 día · Modern science is typically divided into three major branches: the natural sciences (e.g., physics, chemistry, and biology), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences (e.g., logic, mathematics, and theoretical ...
2 de abr. de 2024 · Organic chemistry, field of science concerned with the composition, properties, and structure of chemical elements and compounds that contain carbon atoms. Carbon is unique in the variety and extent of structures that can result from the three-dimensional connections of its atoms.
- The Editors of Encyclopaedia Britannica
16 de abr. de 2024 · chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Hace 4 días · Lifting iron higher and higher. Biological and synthetic catalysts often utilize iron in high oxidation states (+IV and greater) to perform challenging molecular transformations. A coordination ...
