The term 'substance used for chemical analysis' can be summarized as a reagent, which is a substance used to cause a chemical reaction. Reagents are commonly used in laboratories to identify, quantify, and separate components of a sample. They are also used to detect the presence of certain compounds or elements in a sample. Reagents are typically composed of chemicals, such as acids, bases, and salts, and can be used to catalyze reactions or to modify the properties of a sample.