Chemistry is a branch of natural science that deals with the properties and composition of matter, the structure of atoms, the reactions and changes they undergo when forming chemical bonds with other substances to make compounds, and the laws that describe these changes. Chemical analysis can range from qualitative, which focuses on non-numerical information about a chemical species (visible reaction effects, colour change, etc.), to quantitative, which observes relative amounts of components present during chemical reactions and the formation of compounds. Chemistry also has many cross-disciplinary and specialized fields, and is a foundation of modern industrial economies through medicinal research, energy production, environmental science, and more.
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