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Chemistry | Definition, Topics, Types, History, & Facts | Britannica
Jun 22, 2025 · Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization. Today, vinyl, Teflon, liquid crystals, …
Chemical reaction | Definition, Equations, Examples, & Types
May 12, 2025 · A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either …
Chemical element | Definition, Origins, Distribution, & Facts
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 …
Chemical compound | Definition, Examples, & Types | Britannica
Jun 19, 2025 · Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the …
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 …
What is the basic formula for photosynthesis? | Britannica
What is the basic formula for photosynthesis? The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the r
Cellular respiration | Definition, Equation, Cycle, Process, …
Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, …
chemical reaction - Students | Britannica Kids | Homework Help
Chemical reactions abound in the natural world, changing the composition of matter within Earth, on its surface, and in the atmosphere, and driving a vast array of processes in living systems. …
Chemical energy | Definition & Facts | Britannica
chemical energy, Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; such reactions are called …
Salt | Chemistry, History, Occurrence, Manufacture, Uses,
May 20, 2025 · Salt, also called sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes …