Soil is considered a mixture, as it is a composition in which each of the components retains its own properties. Mixtures have no fixed chemical structure or composition, and each of the atoms or molecules can be physica... More »

Sand is a heterogeneous mixture because it is a granular substance composed of small particles of rocks or minerals. A heterogeneous mixture contains components that are not uniform throughout the mixture. More »

All organic compounds contain carbon. Carbon is so important to the structure of organic molecules that organic chemistry has been called the study of carbon and its compounds. Other elements are readily incorporated int... More »

A homogeneous mixture is one that has a uniform composition and the same properties throughout the mixture. This is different than a homogeneous substance, which means that there is only one kind of substance present. A ... More » Science Chemistry

An alkali is a basic ionic compound of an alkali earth metal or alkali metal element. Alkalies are most noted for their ability to neutralize or balance acidity. An alkali solution turns a red litmus paper blue. Caustic ... More »

An element or compound that enters into a chemical reaction is called a reagent, while the elements or compounds that result from a chemical reaction are called products. Reagents can be further defined as reactants, cat... More »

Strictly speaking, no element is named for a cleaning compound. Boron, however, is derived from the Arabic and Persian words for borax, the compound in which it's often found. Borax is a common component in many abrasive... More » Science Chemistry