Chemical Abstracts Service, a division of the American Chemical Society, announced that on September 7 it recorded the 50 millionth substance in CAS, the world's most comprehensive and high-quality ...

All substances have properties. These describe how a substance looks and behaves. There are two types of properties: physical and chemical. Watch this video about how physical and chemical properties ...

Chemical Reactions: A chemical reaction is a process where the substances 8unbdergo a change in their chemical composition. The substances that enter the reaction are called reactants that are then ...

THE use of chemicals around the world is worsening. Artificial substances that are in the nature of chemicals improve products used by consumers but all too often, people and the environment are ...