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Chemistry is a central science that bridges the gap between physics and biology. Chemists study the structure of molecules, the properties of different elements, the behaviour of chemical reactions, and the ways that chemicals can be used to create new materials, fuels, medicines, and more. They use a variety of tools and techniques to study these topics, including spectroscopy, chromatography, and other analytical methods. There are many subjects that are related to chemistry, including biochemistry, organic chemistry, inorganic chemistry, physical chemistry, analytical chemistry, physical chemistry, catalysis, environmental chemistry, materials chemistry and polymer chemistry