polystyrene

"He wore a gold chain around the neck."

"The chemistry student learned that benzene is a ring-shaped molecule containing carbon and hydrogen atoms, often used in making plastics and other industrial chemicals. "

"The recycle of old newspapers was a successful project at the school. "

"My dad made a strong coffee before going to work. "

"A liquid can freeze to become a solid or evaporate into a gas."

"The plastic in my school's new chairs is a polymer. "

"By now, you must surely know which is which."

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

"He burned his manuscript in the fireplace."

"The carbon chain of an alkane may be linear or branched, but must not contain loops (cycles); its chemical formula is of the form CnH2n+2."

"The complicated instructions on the new software difficult me from completing the project on time. "

"The factory uses large quantities of styrene to produce polystyrene cups. "