Chemistry is the branch of physical science that studies the composition, structure, properties, and changes of matter. Matter is defined as anything that has mass and volume. Atoms are the smallest unit of matter. Chemistry covers topics such as atomic theory, atomic structure, how atoms form compounds and/or molecules, classification of the elements, organization of the periodic table, the types of chemical reactions, states of matter, gas laws, nuclear decomposition, intermolecular forces, thermodynamics, etc.
Chemistry is sometimes referred to as the central science because it connects other sciences such as physics, biology, and geology.
There are further subcategories of chemistry, including analytical, organic, physical, and biochemical.
A degree in chemistry is required for many medical careers, forensic engineering, biotechnology, agriculture, and chemical engineering.