Chemical analysis is a process used to identify and quantify the components of a given substance. It involves the use of reagents, assays, and lab tests to determine the composition of a sample. Reagents are substances used to detect, measure, or produce a chemical reaction. Assays are tests used to measure the concentration of a particular substance in a sample. Lab tests are tests conducted in a laboratory setting to analyze the properties of a sample. All of these methods are used together to provide an accurate assessment of the composition of a given substance.