Salt | Chemistry, History, Occurrence, Manufacture, Uses, & Facts ...
2024年9月18日 · 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 called common salt to distinguish it from a class of chemical compounds called salts. Learn more about salt in this article.
Salt | Definition & Properties | Britannica
2024年9月19日 · Salt, in chemistry, substance produced by the reaction of an acid with a base. A salt consists of the positive ion (cation) of a base and the negative ion (anion) of an acid. The reaction between an acid and a base is called a neutralization reaction. The …
Sodium | Facts, Uses, & Properties | Britannica
2024年9月19日 · sodium (Na), chemical element of the alkali metal group (Group 1 [Ia]) of the periodic table. Sodium is a very soft silvery-white metal . Sodium is the most common alkali metal and the sixth most abundant element on Earth , comprising 2.8 percent of Earth’s crust.
Salt - Occurrence, Chemistry, Uses | Britannica
2024年9月18日 · Salt - Occurrence, Chemistry, Uses: Though the material that gives seawater its salty flavour is composed of many substances, sodium chloride, or common salt, is by far the predominant compound.
Soap and detergent | Chemistry, Uses, Properties, & Facts
2024年10月4日 · Soap and detergent, substances that, when dissolved in water, possess the ability to remove dirt from surfaces such as human skin, textiles, and other solids. The seemingly simple process of cleaning a soiled surface is, in fact, complex. Learn more about soap and detergent in this article.
Chemical compound | Definition, Examples, & Types | Britannica
4 天之前 · The substances mentioned above exemplify the two basic types of chemical compounds: molecular and ionic. Methane and water are composed of molecules; that is, they are molecular compounds. Sodium chloride, on the other hand, contains ions; it is an ionic compound.
Molecule | Definition, Examples, Structures, & Facts | Britannica
2024年9月13日 · Molecule, a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance. Learn more about the properties and structures of molecules in …
Sodium bicarbonate | Definition, Uses, & Formula | Britannica
2024年9月13日 · sodium bicarbonate (NaHCO3), white crystalline or powdery solid that is a source of carbon dioxide and so is used as an ingredient in baking powders, in effervescent salts and beverages, and as a constituent of dry-chemical fire extinguishers.
Saltpetre | Definition, Uses, & Facts | Britannica
Saltpetre, any of three naturally occurring nitrates, distinguished as (1) ordinary saltpetre, or potassium nitrate, KNO3; (2) Chile saltpetre, cubic nitre, or sodium nitrate, NaNO3; and (3) lime saltpetre, wall saltpetre, or calcium nitrate, Ca (NO3)2. These three nitrates generally occur as.
Iodized salt | Health Benefits, Nutritional Value & Cooking
Iodized salt, table salt with small amounts of iodine added, usually as potassium iodide, to ensure against dietary deficiency of iodine. Where iodized salt is used, particularly in Switzerland and the United States, endemic goitre has disappeared.