Chemicals encompass every pure substance and compound found in nature or synthesized in laboratories. Five common everyday examples include: Water (dihydrogen monoxide, the universal solvent essential for life), Sodium Chloride (common table salt, an ionic compound vital for biological functions), Carbon Dioxide (a gas composed of carbon and oxygen involved in respiration and photosynthesis), Ethanol (grain alcohol used as a solvent and fuel additive), and Acetic Acid (the primary active chemical component found in household vinegar).