Chemistry

In chemistry, valence electrons are the electrons in the outside or valence electron shell of an atom. They are the electrons located at the outermost…

Valency is a measure of the reactivity of an atom or molecule. In chemistry, valency (sometimes called valence) is the number of chemical bonds the atoms…

Covalent bonds occur when electrons are shared between two atoms. They are chemical bonds between two non-metal atoms. An example is a water, where hydrogen (H)…

Colorimeter A colorimeter is a device used for measuring colors or colorimetry. It can measure the absorbency of light waves. It measures the absorbance of different wavelengths…

In chemistry, concentration is how much of a substance is mixed with another substance. Another definition is that concentration is the ratio of solute in a solution…

Molar concentration, or molarity, or simply concentration, is a term in physical chemistry. It measures the concentration of a solution or mixture. The concentration of…

A chemical equation is a way to predict the way that two or more chemicals will work together. It shows the chemical formulas of substances…

Chromatography is a method using mixed substances that depends on the speed at which they move through special media or chemical substances. It is a…

A chemical formula is a way that chemists describe a molecule. The formula says what atoms, and how many of each type, are in the…

A chemical element is a substance that contains only one type of atom. If a substance contains more than one type of atom, it is…

A chemical compound is a chemical formed from atoms of different chemical elements. The different atoms are joined by chemical bonds. It is a chemical…

Chemical bonds are what join atoms together. They are the connections between atoms in a molecule. They are forces that hold atoms together to make…