]> An acid as a compound which donates a hydrogen ion (H+) to another compound (called a base). [Wikipedia] An alloy is a partial or complete solid solution of one or more elements in a metallic matrix. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may be homogeneous in distribution depending on thermal (heat treatment) history. Alloys usually have different properties from those of the component elements. [Wikipedia] An anion is an ion that has more electrons than protons such that the atom or molecule is negatively charged. [Wikipedia] A base is most commonly thought of as an aqueous substance that can accept hydrogen ions. [Wikipedia] An cation is an ion that has more protons than electrons such that the atom or molecule is positively charged. [Wikipedia] Chemical substance, in chemistry, are material objects that can undergo various transformations related to artificial or natural phenomena [Wikipedia] An extraterrestrial substane is defined as a substance which does not originate from Earth. [Wikipedia] An ion is an atom or molecule where the total number of electrons is not equal to the total number of protons, giving it a net positive or negative electrical charge. [Wikipedia] In chemistry, a mixture is when two or more different substances are mixed together but not combined chemically. The molecules of two or more different substances are mixed in the form of solutions, suspensions, and colloids. [Wikipedia] A metal is a chemical element whose atoms readily lose electrons to form positive ions (cations), and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms.[Wikipedia] 0 In chemistry, a solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is dissolved in another substance, known as a solvent. All solutions are characterized by interactions between the solvent phase and solute molecules or ions that result in a net decrease in free energy. [Wikipedia]