Metacognition is  cognition about cognition, thinking about thinking, or knowing about knowing. It comes from the root word  meta , meaning beyond. It can take many forms; it includes knowledge about when and how to use particular strategies for learning or for problem solving. There are generally two components of metacognition: knowledge about cognition, and regulation of cognition.
In chemistry, an ionic compound is a chemical compound in which ions are held together in a structure by electrostatic forces termed ionic bonds.The positively charged ions are called cations and the negatively charged ions are called anions.onic compounds without the acidic hydrogen ion (H +), or the basic ions hydroxide (OH â) or oxide (O 2â), are also known as salts and can be formed by acid-base reactions. Ionic compounds containing hydrogen ions are classified as acids and compounds containing hydroxide or oxide ions are classified as bases.
â¤ Ionic compounds are charged ions, whereas molecular compounds consist of molecules. â¤ An ionic compound is formed by the reaction of a metal with a non-metal, whereas a molecular compound is usually formed by the reaction of two or more non-metals.he chemical and physical properties of the compound that is eventually formed are different from those of the constituent elements. Most of the substances found in nature exist in the form of compounds, rather than as free elements.