Chemistry is the science of matter at the atomic to molecular scale, dealing primarily with collections of atoms (such as molecules, crystals, and metals). Chemistry deals with the composition and statistical properties of such structures, as well as their transformations and interactions often to become materials encountered in everyday life.

Chemistry also deals with understanding the properties and interactions of individual atoms with the purpose of integration of this knowledge with known facts about larger scale matter in order to obtain a useful insights or make accurate predictions According to modern chemistry, the physical properties of materials are generally determined by their structure at the atomic level which is, itself, determined by the properties and energies of the interactions between atoms and molecules.

Chemistry also involves testing which ranges from qualitative tests, designed to identify specific compounds or chemical groups, to quantitative testing which provides measurements of amounts of specific entities present or measurement of properties.