Chemistry plays an important role in many everyday activities and products. Paints, varnishes, insect sprays, vehicles, alarm clocks, cleaners, and water purification all involve chemical processes and reactions. The human body itself relies on chemistry and is made up of water and elements like oxygen, nitrogen, carbon, calcium, hydrogen, and phosphorus. Nearly every aspect of daily life, from eating, drinking, cooking, personal care products, fuels, and more, has an underlying basis in chemistry.