Pure chlorine gas is greenish-yellow in color, but because the household ingredients are usually diluted, the gas is invisible. Want more cleaning and organizing tips? Sign up for our free daily ...

Pure water is a chemical ... up to “97% of chickens processed in USDA facilities are bathed in chlorine – even certified organic farms and their processors do it.” Other sources differ ...

A chemical element is one of those squares on the periodic table that adorns many a classroom wall. Sure. But what is an element really? It is a more subtle question that you might realise.