pentoxide

"The prisoners were kept in a secure compound. "

"Sad reacts only"

"I went to the park because the weather was nice. "

"The wind blew the door shut violently, making everyone jump. "

"The chemist carefully measured the ingredients for the baking soda volcano experiment in science class. "

"We need oxygen to breathe. "

"The box containing my old toys was stored in the attic. "

"Rust is an iron oxide. "

"To explain a chapter of the Bible."

"Railway crossings without gates are highly dangerous."

"The air we breathe is made of tiny atoms like oxygen and nitrogen. "

"Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom and a chlorine atom."