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.
Wright County, Iowa. Wright County is a county located in the U.S. state of Iowa. As of the 2010 census, the population was 13,229. The county seat is Clarion. The county was formed on January 15, 1851, and named after Silas Wright, a governor of New York, and Joseph Albert Wright, a governor of Indiana.