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Chemical equations are illustrations of the reactants and products in a chemical reaction. Chemical equations are expressed as A + B - C, where A and B are the reactants, and C is the product.


Extraction, distillation, recrystallization and chromatography are different chemical methods of separation. Extraction is useful for separating compounds with different polarities, and distillation is commonly used to purify liquids. Recrystallization is used to purify solids, and chromatography is


Burning, or rather combustion, leaves you with a different material than the one with which you started. A chemical change occurs if a new substance is created and most of the time cannot be reversed.


According to Education Portal, chemical potential energy is any stored energy that has the potential to do work in the future. All physical matter has molecules that contain potential energy.


The chemical equation formula for water is expressed as H2O, but also is acceptable when displayed as HOH. In this equation, two hydrogen atoms react with an oxygen atom to form a single molecule of H2O.


Ammonia is the chemical name for the molecular formula NH3, which is a compound of nitrogen and hydrogen. It is also known by the name azane.


Iron, a metal, is the 26th element on the periodic table. Its atomic weight is 55.845, and it exists as a solid at room temperature. Iron melts at 2,800 degrees Fahrenheit and boils at 5,182 F. In its pure state, iron has a density of 7.874 grams per cubic centimeter.


According to the National Center for Biotechnology Information, the chemical formula for oxygen is O2. The O stands for the oxygen molecule, while the 2 represents the need for two oxygen molecules to form the element.


The chemical name for PbS2 is lead (IV) sulfide. The IV is to show that the lead in the compound has an oxidation state of +4. Lead also has an oxidation state of +2.


The chemical name for the formula CH3COCH3 is acetone, also known as propanone or dimethyl ketone. Acetone is a colorless flammable liquid that is miscible with water, ethanol and ether.