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Chemistry | Definition, Topics, Types, History, Facts | Britannica The identification of pure substances and the analysis of chemical mixtures enable all other chemical disciplines to flourish The importance of analytical chemistry has never been greater than it is today
Chemical element | Definition, Origins, Distribution, Facts - Britannica A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes Elements are the fundamental materials of which all matter is composed Learn more about the origins, distribution, and characteristics of chemical elements in this article
Chemical formula | Definition, Types, Examples, Facts | Britannica Chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds The forms commonly encountered are empirical, molecular, structural, and projection formulas
Photosynthesis | Definition, Formula, Process, Diagram, Reactants . . . Photosynthesis is the process by which green plants and certain other organisms transform light energy into chemical energy During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds
list of chemical elements - Encyclopedia Britannica A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes Elements are the fundamental materials of which all matter is composed
Chemical engineering | Processes, Principles Applications | Britannica The fundamental principles of chemical engineering underlie the operation of processes extending well beyond the boundaries of the chemical industry, and chemical engineers are employed in a range of operations outside traditional areas
Oxygen | Discovery, Symbol, Properties, Uses, Facts | Britannica What is oxygen and where is it found in nature? Why is oxygen important for living organisms? What is the chemical symbol for oxygen and its atomic number? How does oxygen support the process of breathing in humans?