- Chemistry | Definition, Topics, Types, History, Facts | Britannica
Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization Today, vinyl, Teflon, liquid crystals, semiconductors, and superconductors represent the fruits of chemical technology
- 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 reaction | Definition, Equations, Examples, Types - Britannica
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 elements or compounds
- Chemical synthesis | Organic Inorganic Reactions | Britannica
Chemical compounds are made up of atoms of different elements, joined together by chemical bonds A chemical synthesis usually involves the breaking of existing bonds and the formation of new ones
- Lead | Definition, Uses, Properties, Facts | Britannica
What is lead as a chemical element? What does lead look like and what is its symbol on the periodic table? Where is lead found in nature? What are some uses of lead in everyday life?
- Periodic table | Definition, Elements, Names, Symbols, Groups, Charges . . .
Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number When the elements are thus arranged, there is a recurring pattern in which elements in the same column (group) have similar properties
- Ammonia | Definition, Preparation, Physical Properties, Chemical . . .
Professor and Associate Head, Department of Chemistry, University of Illinois at Urbana-Champaign Author of Chemical Principles and many others
- Cellular respiration | Definition, Equation, Cycle, Process, Reactants . . .
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, as waste products, carbon dioxide and water
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