Apr 24, 2025 · Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization. Today, vinyl, Teflon, liquid crystals, …

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 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. …

Any substance that cannot be decomposed into simpler substances by ordinary chemical processes is defined as a chemical element. Only 94 such substances are known to exist in …

May 10, 2025 · Periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring …

Chemical energy is a form of potential energy that is in all substances. Food is the most important source of chemical energy for living things. The chemical energy in food is converted, or …

Jun 6, 2025 · An organic compound is any chemical compound in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or …

May 30, 2025 · ester chemical compound Also known as: carboxylic ester Written and fact-checked by The Editors of Encyclopaedia Britannica

Carbon dioxide is a chemical compound that is usually in the form of a gas. It is made up of one atom of carbon and two atoms of oxygen. Its chemical formula is CO2. Carbon…

A chemical element is a basic substance. It cannot be broken down into simpler substances. Chemical elements are the building blocks for all matter —that is, everything that takes up …