- 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
- How Is Gold Formed? - Encyclopedia Britannica
Of the 90 chemical elements found in nature only 19 are known to occur as minerals These native elements are commonly divided into three groups—namely, metals (platinum, iridium, osmium, iron, zinc, tin, gold, silver, copper, mercury, lead, chromium); semimetals (bismuth, antimony, arsenic, tellurium, selenium); and nonmetals (sulfur, carbon)
- 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
- Major Supreme Court Cases from the 2024–25 Term
Among the questions presented in the cases added were: whether so-called “ghost guns,” or firearms that are assembled from kits or separately sold parts, can be regulated by the federal Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF); whether a person on death row in Oklahoma deserves a new trial because prosecutors concealed the
- Chemical Definition Meaning | Britannica Dictionary
CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals
- The Horrifying History of Gas Warfare | Britannica
But Haber was willing to pervert this chemical genius to help Germany win the war And he set out to craft deadlier chemical weapons, leading a group of scientists the German military ghoulishly called "the disinfection unit "
- How Does Metal Rust? | Science, Process, Facts | Britannica
Rust is the result of a chemical reaction between metal, typically iron, and oxygen in the presence of moisture This process, known as oxidation, transforms the metal into a new compound, iron oxide, which we commonly recognize as rust
- 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
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