A compound is a chemical substance that forms when two or more different elements combine in a fixed ratio. Water (H2O), for example, is a compound that is made up of two hydrogen atoms for every one oxygen atom. Sodium chloride (NaCl) is a compound made up of one sodium atom for every chlorine atom.
Hudson, Iowa. Hudson is a city in Black Hawk County, Iowa, United States. The population was 2,282 at the 2010 census. The rural community of Hudson has grown in recent years and is included as a part of the Waterloo-Cedar Falls Metropolitan Statistical Area. Contents.
Council Bluffs is a city in and the county seat of Pottawattamie County, Iowa, United States. It is located on the east bank of the Missouri River, across from what is now the much larger city of Omaha, Nebraska. Council Bluffs was known until 1852 as Kanesville, Iowa â the historic starting point of the Mormon Trail and eventual northernmost anchor town of the other emigrant trails.